Cavite Integrated Water Resource Master Plan

Cavite Integrated Water Resource Management Master Plan

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TABLE OF CONTENTS

Page

Chapter 1 Introduction ........................................................................................... 1-1

1.1 Review of Cavite‘s previous initiatives towards integration ...................... 1-2

1.2 Cavite Integrated Water Resource Management Plan ............................. 1-3

Chapter 2 Provincial Physical and Socio-Economic Profile ................................ 2-1

2.1 Physical Environment .............................................................................. 2-1

2.1.1 Geographic Setting ...................................................................... 2-1

2.1.2 Physical Features ........................................................................ 2-3

2.1.3 Meteorology ............................................................................... 2-13

2.2 Infrastructure ......................................................................................... 2-16

2.2.1 Transportation ............................................................................ 2-16

2.2.2 Communication .......................................................................... 2-16

2.2.3 Water Supply ............................................................................. 2-17

2.2.4 Existing Water Service Providers ............................................... 2-19

2.2.5 Sanitation and Sewerage ........................................................... 2-21

2.2.6 Solid Waste Disposal Systems ................................................... 2-23

2.3 Socio-Economic and Demographic Environment ..................................... 2-1

2.3.1 Population, Density and Growth Rate .......................................... 2-1

2.3.2 Urban-Rural Population Structure ................................................ 2-2

2.3.3 Age Structure and Dependency Ratio .......................................... 2-4

2.3.4 Number of Households and Household Size ................................ 2-5

2.3.5 Income Levels and Profile ............................................................ 2-6

2.3.6 Labor Force and Employment Structure ....................................... 2-7

2.3.7 Health Indicators .......................................................................... 2-8

2.3.8 Demographic and Employment Projections.................................. 2-9

2.4 Economic Structure ................................................................................. 2-1

2.4.1 Gross Regional Domestic Product (GRDP) by Industrial

Origin: CALABARZON ................................................................. 2-1

2.4.2 Agriculture, Fishery, Poultry and Livestock................................... 2-1

2.4.3 Industry, Commerce and Trade .................................................... 2-5

Chapter 3 Water Demand Assessment ................................................................. 3-1

3.1 Population Projections ............................................................................. 3-1

3.2 Water Demand Projections ...................................................................... 3-2

3.2.1 Domestic (Municipal) Water Demand ........................................... 3-2

3.2.2 Agricultural Water Requirements .................................................. 3-4

3.2.3 Industrial Water Demand............................................................ 3-11

3.2.4 Recreation ................................................................................. 3-13

3.2.5 Power Generation ...................................................................... 3-14

3.2.6 Total Water Demand .................................................................. 3-14

Chapter 4 Water Resources Assessment ............................................................. 4-1

4.1 Surface Water Assessment ..................................................................... 4-1

4.1.1 General ........................................................................................ 4-1

4.1.2 Rainfall ......................................................................................... 4-1

4.1.3 Catchment Area and River System .............................................. 4-3


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4.1.4 Irrigation Systems ........................................................................ 4-5

4.1.5 Stream flow Analysis .................................................................... 4-6

4.1.6 Flow Duration Curve (FDC) .......................................................... 4-9

4.1.7 Lakes ......................................................................................... 4-17

4.1.8 Summary and Conclusions : Surface Water Assessment ........... 4-20

4.2 Groundwater Assessment ..................................................................... 4-20

4.2.1 Groundwater Resources Inventory ............................................. 4-20

4.2.2 Results of Geo-resistivity Survey ............................................... 4-26

4.2.3 Water Balance ........................................................................... 4-29

4.2.4 Aquifer and Characteristics ........................................................ 4-35

4.2.5 Summary of Groundwater Resource Assessment ...................... 4-43

4.2.6 Sewerage, Septage and Water Quality ...................................... 4-44

4.3 General Conclusions ............................................................................. 4-45

Chapter 5 Water Resource Development Framework .......................................... 5-1

5.1 Principles for Integrated Water Resources Development and Management ........................................................................................... 5-1

5.2 The Key Issues ........................................................................................ 5-2

5.3 Meeting the Development Challenges ..................................................... 5-7

5.4 Addressing the Supply-Demand Gap....................................................... 5-8

5.5 Sewerage and Sanitation Development Framework ................................ 5-9

Chapter 6 Legal Framework and Institutional Arrangements .............................. 6-1

6.1 Frameworks and Principles ..................................................................... 6-1

6.2 Key Water-Related Legislation ................................................................ 6-1

6.3 Existing Organizational Structure, Functions and Activities of Key

Agencies ................................................................................................. 6-5

6.4 Authority of the Provincial Government of Cavite to Formulate the

CIWRMMP .............................................................................................. 6-8

6.5 Issues and Challenges ............................................................................ 6-9

6.6 Legal Feasibility of the Proposed Sources of Water for The

Intergrated Water Resource management Plan ..................................... 6-13

6.6.1 Aggregation of Water Rights ...................................................... 6-13

6.7 Recommended Institutional Arrangement .............................................. 6-14

6.7.1 Creation of a Cavite Water Resources Management

Committee (CWRMC) ................................................................ 6-14

6.7.2 Entering into Public-Private Partnerships ................................... 6-16

6.7.3 Legislative Agenda for the Province of Cavite ............................ 6-18

Chapter 7 Policies, Strategies and Programs and Projects ................................. 7-1

7.1 Policies .................................................................................................... 7-1

7.2 Strategies ................................................................................................ 7-1

7.3 Programs and Projects ............................................................................ 7-2


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LIST OF TABLES

Table 2.1-1 Temperature and Relative Humidity, Sangley Point and Ambulong

Stations ................................................................................................. 2-14

Table 2.1-2 Average Daily Evaporation Rate, Tagaytay City Station ......................... 2-14

Table 2.1-3 Monthly Normal and Extreme Wind Speed and Direction, Sangley

Point and Ambulong Stations ................................................................ 2-15

Table 2.2-1 Water Supply Service Coverage by City/Municipality .............................. 2-18

Table 2.2-2 Existing Water Rates ............................................................................... 2-20

Table 2.2-3 Estimated Maximum Water Production Capacity Per Water

Agency .................................................................................................. 2-21

Table 2.2-4 Inventory of Sanitation Facilities by City/Municipality .............................. 2-22

Table 2.2-5 Cavite Province Disposal Sites, 2010 ..................................................... 2-24

Table 2.3-1 Cavite: Population and Population Density, by City/Municipality, 2000-2010 ............................................................................................... 2-1

Table 2.3-2 Cavite: Percentage Share of Urban and Rural Population, by

City/Municipality, 2000 & 2010................................................................. 2-3

Table 2.3-3 Cavite: Number of Households and Household Size, by

City/Municipality, 2000 & 2010................................................................. 2-5

Table 2.3-4 Cavite: Labor Force, Employment and Unemployment ............................. 2-8

Table 2.3-5 Vital Health Statistics: 2009 and 2010 ...................................................... 2-8

Table 2.3-6 Ten Leading Causes of Morbidity and Mortality: 2010 .............................. 2-8

Table 2.3-7 Cavite: Labor Force Projections................................................................ 2-9

Table 2.4-1 Gross Regional Domestic Product (GRDP): CALABARZON vs

Philippines ............................................................................................... 2-1

Table 2.4-2 Cavite: Production of Major Agricultural Crops (Metric Tons) ..................... 2-2

Table 2.4-3 Cavite: Area Planted to Crops ................................................................... 2-3

Table 2.4-4 Cavite: Fishery Production (Metric Tons) .................................................. 2-4

Table 2.4-5 Cavite: Livestock and Poultry Population (‗000 Heads) ............................. 2-5

Table 2.4-6 Operating Industrial Estates/Economic Zones in Cavite: 2010 .................. 2-8

Table 3.1-1 Population Projection Summary (in persons) ............................................ 3-1

Table 3.2-1 Unit Water Consumption Standard ........................................................... 3-2

Table 3.2-2 Projected Total Provincial Water Demand (mld) ..................................... 3-14

Table 4.1-1 PAGASA Rainfall Stations ........................................................................ 4-2

Table 4.1-2 Annual Rainfall Statistics .......................................................................... 4-3

Table 4.1-3 Monthly Rainfall Statistics ......................................................................... 4-3

Table 4.1-4 Major River Basins ................................................................................... 4-3

Table 4.1-5 Gauged Rivers in Cavite ........................................................................... 4-5

Table 4.1-6 Monthly Discharge of Ilang-Ilang and Balsahan Rivers, cms .................... 4-8

Table 4.1-7 Flow Duration Categories ......................................................................... 4-9

Table 4.1-8 Monthly Flow Duration of Maragondon River (cms) ................................ 4-10

Table 4.1-9 Daily Flow Duration Curve ...................................................................... 4-10

Table 4.1-10 Flow Duration of Maragondon River ...................................................... 4-11

Table 4.1-11 Monthly Flow Duration of Panaysayan River (cms) ................................ 4-12

Table 4.1-12 Daily Flow Duration Curve ..................................................................... 4-12

Table 4.1-13 Flow Duration of Panaysayan River ....................................................... 4-13

Table 4.1-14 Monthly Streamflow Statistical Analysis of Balsahan (cms) ................... 4-14

Table 4.1-15 Monthly Streamflow Statistical Analysis of Ilang-Ilang Rivers ................ 4-15


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Table 4.1-16 Cavite River Survey Stations ................................................................. 4-17

Table 4.1-17 Flow Duration of Maragondon River at Critical Months, cms .................. 4-20

Table 4.2-1 Recharge and Recoverable Groundwater per City/Municipality .............. 4-34

Table 5.2-1 2012 Groundwater Supply-Demand Gap (in MLD) ................................... 5-3

Table 5.2-2 Water Requirements Summary (MLD), 2012-2040 ................................... 5-4

Table 5.2-3 Allocation of Water Rights by Source and Purpose, Cavite, 2011 ............. 5-4

Table 5.2-4 Irrigation Water Rights vs. Estimated Water Requirements ...................... 5-6

Table 6.2-1 Relevant Legal Issuances......................................................................... 6-2

Table 6.3-1 Key Water Supply Sector Agencies: Delineated Roles and

Responsibilities ....................................................................................... 6-7

Table 6.5-1 Allocation of water rights by source and purpose, Cavite, 2011 ................ 6-9

Table 6.5-2 Irrigation Water Rights Granted vs. Estimated Water

Requirements ........................................................................................ 6-13

Table 6.7-1 Levels of Approval of LGU Project .......................................................... 6-17

Table 6.7-2 Relevant Local Offices and Committees for PPP .................................... 6-17


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LIST OF FIGURES

Figure 2.1-1 CALABARZON (Region IV-A) ................................................................. 2-1

Figure 2.1-2 Cavite Province and its Cities and Municipalities ..................................... 2-2

Figure 2.1-3 Legislative District ................................................................................... 2-2

Figure 2.1-4 Elevation of Cavite Province .................................................................... 2-4

Figure 2.1-5 River Network .......................................................................................... 2-5

Figure 2.1-6 Provincial Land Use ................................................................................ 2-6

Figure 2.1-7 Provincial Soil Types ............................................................................... 2-7

Figure 2.1-8 General Geology ..................................................................................... 2-9

Figure 2.1-9 Active Faults and Trenches ................................................................... 2-11

Figure 2.1-10 West Valley Fault ................................................................................. 2-12

Figure 2.1-11 Climate of the Philippines and Frequency of Typhoons ........................ 2-13

Figure 2.2-1 Level III Water Service Coverage (2009) ............................................... 2-19

Figure 2.2-2 Solid Waste Disposal Map ..................................................................... 2-23

Figure 2.3-1 Cavite: Population by Age Group, 2010 (Percent of Total Population) .............................................................................................. 2-4

Figure 2.3-2 Incidence of Poverty among Families: 2003-2009 (% of Families) ........... 2-6

Figure 2.3-3 Incidence of Poverty among Population: 2003-2009 (% of

Population) .............................................................................................. 2-7

Figure 2.4-1 Agricultural Land Use .............................................................................. 2-4

Figure 2.4-2 Cavite: Number of Industrial Establishments ........................................... 2-6

Figure 2.4-3 Industrial, Commercial and Recreational Facilities .................................. 2-7

Figure 2.4-4 Value of Exports and Imports Generated by Economic Zones in

Cavite: 2002-2010 (US$ Million) .............................................................. 2-9

Figure 2.4-5 Cavite: Number of Registered Business Establishments ......................... 2-9

Figure 2.4-6 Domestic Demand Center ..................................................................... 2-10

Figure 3.2-1 Cavite Projected Domestic Water Demand (2012-2040) ......................... 3-3

Figure 3.2-2 Cavite Total Irrigable Area (2005-2040) ................................................... 3-5

Figure 3.2-3 Total Average Benefitted Service Area (2010-2040) ................................ 3-5

Figure 3.2-4 Total Irrigated Rice Water Demand (2010-2040) ..................................... 3-6

Figure 3.2-5 Total Area Planted to Vegetables (2005-2040) ........................................ 3-6

Figure 3.2-6 Total Vegetables Water Demand (2010-2040) ........................................ 3-7

Figure 3.2-7 Total Area Planted to Cut flowers & Ornamentals (2005-2040) ............... 3-7

Figure 3.2-8 Cut flowers & Ornamentals Water Demand (2010-2040) ......................... 3-8

Figure 3.2-9 Livestock Water Demand (2010-2040) .................................................... 3-8

Figure 3.2-10 Poultry Heads ‗000 Projections (2010-2040) .......................................... 3-9

Figure 3.2-11 Poultry Water Demand (2010-2040) ....................................................... 3-9

Figure 3.2-12 Aquaculture Area (2007-2040) ............................................................. 3-10

Figure 3.2-13 Aquaculture Water Demand (2010-2040) ............................................. 3-10

Figure 3.2-14 Water Demand per City/Municipality (2010-2040) ................................ 3-11

Figure 3.2-15 Phase Development of Industrial Estates/Economic Zones (2010-2040) ........................................................................................... 3-12

Figure 3.2-16 Number of Industrial Establishments Outside IEs/EZs (2005-

2040) ..................................................................................................... 3-12

Figure 3.2-17 Cavite Industrial Water Demand (2010-2040) ....................................... 3-13

Figure 3.2-18 Cavite Recreational Water Demand (2010-2040) ................................. 3-14

Figure 3.2-19 Cavite Water Demand (Year 2012) ...................................................... 3-15


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Figure 3.2-20 Cavite Water Demand (Year 2040) ...................................................... 3-15

Figure 3.2-21 Total Cavite Ground Water Demand (2012-2040) ................................ 3-16

Figure 3.2-22 Total Cavite Surface Water Demand (2012-2040) ................................ 3-16

Figure 4.1-1 Mean Annual Rainfall Isohyetal of Cavite ................................................ 4-2

Figure 4.1-2 Major River Basins in Cavite ................................................................... 4-4

Figure 4.1-3 Existing Irrigation Systems ...................................................................... 4-6

Figure 4.1-4 Plot of Minimum, Median and Mean Discharge of Maragondon

River ........................................................................................................ 4-7

Figure 4.1-5 Plot of Minimum, Median and Mean Discharge of Panaysayan

River ........................................................................................................ 4-8

Figure 4.1-6 Flow Duration Curve for Maragondon River........................................... 4-11

Figure 4.1-7 Flow Duration Curve for Panaysayan River ........................................... 4-13

Figure 4.1-8 Flow Duration Curve for BalsahanRiver................................................. 4-14

Figure 4.1-9 Flow Duration Curve for Ilang-Ilang River .............................................. 4-15

Figure 4.1-10 Laguna de Bay ..................................................................................... 4-17

Figure 4.1-11 Taal Lake ............................................................................................. 4-19

Figure 4.2-1 Selected Deepwell Location .................................................................. 4-22

Figure 4.2-2 VES Location ........................................................................................ 4-27

Figure 4.2-3 Electrostratigraphic Section A-A‘ ........................................................... 4-28

Figure 4.2-4 ARMA Model Area................................................................................. 4-30

Figure 4.2-5 Water Balance – Area 1 ........................................................................ 4-31



Figure 4.2-8 Lithologic Section .................................................................................. 4-35

Figure 4.2-9 Groundwater Level - 1980 ..................................................................... 4-37

Figure 4.2-10 Elevation of Groundwater Level before 1990 ....................................... 4-38

Figure 4.2-11 Elevation of Groundwater Level - 2003 ................................................ 4-39

Figure 4.2-12 Groundwater Level Change 1990-2003 ................................................ 4-40

Figure 4.2-13 Specific Capacity .................................................................................. 4-42

Figure 4.2-14 Transmissivity ...................................................................................... 4-43

Figure 5.1-1 Framework for the Cavite Integrated Water Resource

Management System ............................................................................... 5-2

Figure 5.2-1 Allocation of Water Rights by Source and Purpose, Cavite 2011............. 5-5

Figure 5.3-1 Conceptual Overview : Development Strategy and

Implementation Framework ..................................................................... 5-7

Figure 5.4-1 Groundwater Availability, 2012 ................................................................ 5-8

Figure 6.5-1 Allocation of water rights by source and purpose, Cavite 2011 ................ 6-9

Figure 6.5-2 Allocation of water rights by source and purpose, Cavite 2011

(without surface water) .......................................................................... 6-10

Figure 6.5-3 NWRB-granted Groundwater Rights, Cavite, December 2011............... 6-10


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ANNEXES

ANNEX I - MAPS AND FIGURES

Annex I-1 Legislative District Map

Annex I-2 Topographic Map

Annex I-3 Road Network Map

Annex I-4 River Network Map

Annex I-5 Elevation Map

Annex I-6 Slope Map

Annex I-7 Spring Location Map

Annex I-8 Land Use Map of Cavite

Annex I-9 Soil Distribution Map

Annex I-10 Geologic Map

Annex I-11 Level III Water Service Coverage Map (as of 2009)

Annex I-12 Water Management Authority Map

Annex I-13 Solid Waste Disposal Site Map

Annex I-14 Domestic Demand Centers

Annex I-15 Agricultural Land Use Map

Annex I-16 Industrial, Commercial & Recreation Land Use Map

Annex I-17 Domestic Water Demand Center Map

Annex I-18 Existing Deepwell Location Map

Annex I-19 Groundwater Level Map - 1980

Annex I-20 Elevation of Groundwater Level Before 1990

Annex I-21 Elevation of Groundwater Level - 2003

Annex I-22 Groundwater Level Change 1990 – 2003

Annex I-23 Specific Capacity Map

Annex I-24 Transmissivity Map

Annex I-25 Groundwater Availability Map, 2012

ANNEX II - DATA AND INFORMATION

Annex II-1 Summary of Existing Level III Water Supply Facilities

Annex II-2 Water Rate Schedule (as of January 2012)

Annex II-3 Historical City/Municipality Population

Annex II-4 City/Municipality Population Projections

Annex II-5 2012 Population and Domestic Water Demand Projections







Annex II-12 Domestic Water Demand Summary, MLD

Annex II-13 Irrigation Data

Annex II-14 Agriculture Water Demand Projections, MLD

Annex II-15 Industrial Water Demand Projections, MLD


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Annex II-16 Recreation Water Demand Projections, MLD

Annex II-17 Total Water Demand Projections, MLD

Annex II-18 Surface Water Quality Test Results

Annex II-19 Rainfall and Temperature Data

Annex II-20 Data Summary of Selected Wells

Annex II-21 Summary of Selected Geo-resistivity Data

Annex II-22 Safe Yield of Individual Well

Annex II-23 NWRB Well Records

Annex II-24 LWUA Well Records

Annex II-25 Dasmariñas City Water District‘s Well Records

Annex II-26 SWECO Well Data Summary

Annex II-27 WATCON Geo-resistivity Survey Data


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ABBREVIATIONS AND ACRONYMS

ARMA Autoregressive Moving Average

BWSA Barangay Water Supply Association

BOD Biochemical Oxygen Demand

BMS Biodiversity Monitoring System

BOI Board of Investments

BFAR Bureau of Fisheries and Aquatic Resources

BRL Bureau of Research Laboratories

BSWM Bureau of Soils and Water Management

BRS Bureau research and Standards

CALABARZON Cavite, Laguna, Batangas, Rizal and Quezon

C-I Commercial Industrial

CAGR Compound Annual Growth Rate

CARP Comprehensive Agrarian Reform Program

CLUP Comprehensive Land Use Plan

CPLA Cordillera People‘s Liberation Army

m3 cum Cubic meter

cms Cubic meter per second

DAO Department of Administrative Order

DA Department of Agriculture

DOF Department of Finance

DOH Department of Health

DILG Department of Interior and Local Government

DPWH Department of Public Works and Highways

DSWD Department of Social Welfare & Development

DBP Development Bank of the Philippines

E East

EZ Economic Zone

EHS Environmental Health Services

EMB Environmental Management Bureau

EMB-DENR Environmental Management Bureau-Department of

Environment and Natural Resources

EO Executive Order

EVT Extreme Value Type

FMB Forest Management Bureau

GMA General Mariano Alvarez

GIS Geographic Information Systems

GRDP Gross Regional Domestic Product

GR Growth Rate

Ha(s) hectare (s)

IE Industrial Estate

ITCZ International Tropical Convergence Zone


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JICA Japan International Cooperation Agency

KALAHI-CIDSS Kapit Bisig Laban sa Kahirapan- Comprehensive &

Integrated Delivery of Social Services

LFPR Labor Force on Participation Rate

LLDA Laguna Lake Development Authority

LBP Land Bank of the Philippines

LGUs Local Government Units

LWUA Local Water Utilities Administration

MSL Mean Sea Level

MOA Memorandum of Agreement

mamsl Meter above mean sea level

MSWI Maynilad Water Services, Incorporated

MWSS Metropolitan Waterworks and Sewerage System

MGB Mines and Geosciences Bureau

MNLF Moro National Liberation Front

MPDC/ MPDO Municipal Planning and Development Coordinator/

Municipal Planning and Development Office

NAPC National Anti-Poverty Commission

NEDA National Economic Development Authority

NEA National Electrification Administration

NHRC National Hydraulic Research Center

NIPAS National Integrated Protected Area System

NIA National Irrigation Authority

NPC National Power Corporation

NSCB National Statistical Coordination Board

NSO National Statistics Office

NWIN National Water Information Network

NWRB National Water Resources Board

N North

OCD Office of Civil Defense

OEA Office of Energy Affairs

O&M Operation and Maintenance

% Percentage

PAF Philippine Air Force

PAGASA Philippine Atmospheric Geophysical and

Astronomical Services Administration

PCAFNRRD Philippine Council for Agricultural, Forestry &

Natural Resources Research & Development

PEZA Philippine Economic Zone Authority

PGDB Philippine Ground Water Data Bank

PNSDW Philippine National Standard for Drinking Water

PPA Philippine Ports Authority

PTA Philippine Tourism Authority

POP Population


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PD Presidential Decree

PMO Project Management Office

PMO-MFCP Project Management Office-Major Flood Control

Projects

PMO-RWS Project Management Office-Rural Water Supply

PMO-SWIM Project Management Office-Small Water

Impounding Projects

PAWB Protected Area and Wildlife Bureau

PPDO Provincial Planning and Development Office

PPP Public Private Partnership

RPMP Rebolusyong Partido ng Manggagawa Pilipinas

RDC Regional Development Council

RA Republic Act

RPA Revolutionary Proletarian Army

ROW Right of Way

RWSA Rural Water Supply Association

SEP Socio Ecological Profile

SES Socio-Economic Survey

SCS Soil Conservation Services

S South

m2, sum Square meter

TWG Technical Working Group

TOR Terms of Reference

T Time or Period

TDS Total Dissolved Solid

TSS Total Suspended Solids

TMC Trece Martirez City

UNOPS United Nations Office for Project Services

VES Vertical Electrical Sounding

WD Water District

WSP Water Supply Providers

WSS Water Supply Sectors

W West


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Executive Summary

CAVITE INTEGRATED WATER RESOURCE MANAGEMENT MASTER PLAN

BACKGROUND

1. The province of Cavite recognizes the need for an updated, integrated, and comprehensive water management plan in view of the rapid growth in population, increased economic activity, decreasing groundwater levels resulting in groundwater mining, salt-water intrusion in coastal areas, pollution in rivers, and competition over water rights. The Cavite Integrated Water Resource Management Master Plan was prepared in response to this need.

2. Cavite‘s Provincial Development and Physical Framework Plan (PDPFP) 2008-2013 identified the annual depletion of ground water and the pollution of major rivers as among the issues concerning water supply sources. The Cavite Integrated Water Resources Management Master Plan aims to update the findings of the past studies of JICA (1995) and SWECO (2004), among other studies, which focused on ground water source development for selected areas in Cavite. The recommendations of the master plan will be mainstreamed into the updated version of the PDPFP.

3. The legislative fiat for the updating activity was issued under Sangguniang Panlalawigan Resolution No. 082-S-2012 which authorizes the Provincial Governor, Hon. Juanito Victor C. Remulla Jr., to formulate an Integrated Water Resource Management Master Plan that envisions the environmentally sustainable utilization of the province‘s water resources to help meet and satisfy the water needs and requirements of the estimated 4.8 million Cavitenos by 2020.

STUDY AREA

4. The study area covers the Province of Cavite, located in Region IV-A or the CALABARZON Region, whose proximity to Metro Manila gives it a significant edge in terms of economic development. With a total land area of 142, 706 hectares, Cavite is composed of four cities and 19 municipalities with a total of 829 barangays distributed into its seven (7) legislative districts.

5. Rivers and streams that originate from upland areas drain into the province. These waterways, with


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long and narrow drainage areas, generally flow in northerly and northwesterly directions before emptying into the Manila Bay or the Laguna de Bay. The major river systems include the Maragondon, Labac, Cañas and San Juan River Basins.

OBJECTIVES OF THE PLAN

6. The goal of the Integrated Water Resources Management Master Plan for the

Province of Cavite is to map out a development strategy that will promote the optimal and sustainable development and management of the water resources of one of the fastest growing provinces in the country. The specific objectives of the master plan are as follows:

To determine current and future water supply demand for domestic (residential, commercial, institutional and small industries), irrigation, fisheries, livestock raising, industrial and recreational purposes;

To determine the climatic, hydrologic, and hydro-geologic environments of the study area, particularly, the availability and quantity of surface water and groundwater;

To formulate a comprehensive water resources development and management framework for the optimum utilization of water resources for water supply projects in the study area;

To identify the network of institutional relationships in water resources development and management, particularly in water supply development at the study area which includes national, regional, and local agencies;

To present descriptions of the organizational structure, functions, and activities of the key agencies at water resource level area;

To recommend institutional arrangements for the implementation of potential water supply projects; and

To establish the policies, formulate the corresponding strategies and develop the attendant shopping list of potential programs and projects that shall serve as the development and management blueprint for the province‘s water supply in the short, medium and long term planning horizons.

PRINCIPLES FOR PLAN PREPARATION

7. The preparation of the Cavite Integrated Water Resource Management Master Plan was guided by the following principles as contained in the Philippine Water Supply Sector Roadmap (NEDA 2008):

Water is a human right and the government has an obligation to respect, protect and fulfill the enjoyment of the right to water;

Water is a finite and vulnerable resource, essential to sustain life, development and the environment. It should be managed for the common good;

Access to water should be equitable and sensitive to gender and the disadvantaged;


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The governance of water resources should be transparent and socially accountable and its management should be decentralized at the lowest possible level;

Water supply services should be financially sustainable and socially acceptable;

Water supply services should be demand responsive. This includes appropriateness and viability of technology and management options at various levels;

Water supply projects should have capacity development components at all levels inclusive of knowledge management that promotes a learning environment for all stakeholders;

Water supply provision should be a priority component in poverty reduction programs. This means giving priority to public allocation for water supply services;

Sanitation is directly linked to water supply; and

The development of the water supply sector should contribute to the promotion of gender equality.

SUMMARY OF ISSUES AND CHALLENGES

8. An assessment of the present condition pertaining to the water and sanitation situation in the Province of Cavite indicates the following issues and concerns:

The present water supply and distribution systems covering the Province of

Cavite is no longer able to meet the present and future aggregate demand

for water;

Water abstraction in a number of areas in the Province has already reached

critical points causing decreased groundwater levels and resulting in

groundwater mining as well as salt-water intrusion in coastal areas;

To support the short-, medium, and long-term water requirements of the

province, the conjunctive use of surface water and groundwater sources

and/or the importation of water from nearby provinces will be needed;

The planning, development and provision of water supply is de-linked from

that of sanitation facilities, particularly sewerage and septage facilities;

There is lack of any septage collection and treatment system as well as any piped waste water collection and treatment system or a centralized sewerage system. Due to this lack, septic tank effluent is generally allowed to leach into the ground while untreated waste water from households and industrial establishments is returned to the water sources;

There is a mismatch between the granting and utilization of water rights vis-a-vis needs and nature of usage;

Existing institutional and regulatory frameworks both at the national and provincial/local levels appear to be weak and fragmented;

There appears to be a lack of a coherent financing framework that can rationalize financing in the water sector to make the fullest use of limited


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public funds and encourage concessional financing, and private sector investments.

POLICIES, STRATEGIES, AND KEY LEGISLATIVE AGENDA

9. The relevant guiding policies, corresponding strategies in support of such policies and the necessary key legislative agenda to address needed institutional reforms as well as the aggregation of water rights and the tapping of Taal Lake and Laguna Bay as potential water sources are as follows:

Policies

Provide the whole population of Cavite Province access to safe and potable water and basic sanitation

Optimize the use of available water through a more rationalized allocation of resources and water rights based on need and usage

Improve health outcomes and effect a sustainable environment through improved sanitation, septage, and sewerage systems provision particularly in highly urbanized and/or densely populated areas

Encourage private sector participation in the financing, implementation and/or operation of water resources development and management projects and other related undertakings of the Cavite Provincial Government

Strategies

Development of new water supply sources based on a viable provincial land use plan, to include as well importation of water from nearby provinces, to meet increasing demand that are sustainable, stable, reasonable and which will provide equitable and affordable water supply for all end users

Enable the participation of concerned service providers in plan development, programming and operations, among others, in order to improve coverage, efficiency and sustainability of related infrastructure

Enactment of legislation/ordinance to introduce financing innovation for the implementation of sewerage and septage system projects, that will link these services to revenue-generating water service provision in order to facilitate investment cost recovery.

Establishment of an effective and clear monitoring system to assess and address the sustainability of developed related infrastructure

Imposition of an environmental user’s fee, particularly on those without water rights, and which shall be based on the cost of replenishment and rehabilitation of the affected water bodies.

Introduction and/or enactment of appropriate legal instrument to address institutional and regulatory issues relating to the integrated management and development of the province’s water resources.

Stimulation of growth in rural areas to curb rural-urban migration that has led to increasing pressures in ecosystems and water bodies as well as unsustainable land use practices in urban areas.


ES - 5

Promotion of environmental education, particularly in water resource management, to enable people to appreciate and understand the complexity of environment and their roles and responsibilities in sustainable water resource management.

Resource regulation shall be strengthened to ensure that surface and ground water supply sources are sustainably developed, managed and utilized.

Key Legislative Agenda

Aggregation of existing water rights through any of the following ways or a combination thereof: (a) negotiation with individual water rights holders for the transfer of water rights, (b) individual revocation for non-use, water wastage or violations against the water code or (c) mass revocation in favor of a project for greater beneficial use

Creation of a Cavite Water Rights Clearing House and Management Committee (CWRMC) to rationalize the use and development of water resources in the province, which functions will include, among others: (1) confirming and examining the compatibility of existing water rights with the CIWRMMP; and (2) ensuring that all water rights heretofore granted shall be in conformity with the CIWRMMP

Designation of a representative body to explore and negotiate for the extraction of water from Taal Lake and Laguna Bay for use as potential surface water source for the province.

PROGRAMS AND PROJECTS

10. To implement the Cavite Integrated Water Resource Management Master Plan, a long-list of time-bound programs and projects has been formulated. Over the short-term period, covering about one to three years, a total budgetary amount of PhP 19.0 Billion is earmarked for immediate implementation. A total budget of PhP 15.5 Billion and PhP 33.7 Billion are earmarked over the medium-term and long-term period.

Program/Project Description Estimated Cost

(P Billion)

Short Term Development Works (1-3 years)

Surface water development Abstraction from river sources and provision of treatment plant and transmission facilities as well as other necessary facilities

5.0

Groundwater Development and Management

Abstraction of water through deep wells and springs and provision of pump stations, pipelines and other support facilities.

6.5

Water distribution system development and expansion

(a) Provision of Level I water supply systems, (b) provision of Level II water supply systems and (iii) provision of Level III water supply systems and expansion of existing area coverage

1.0

Measurement and monitoring of water efficiency

Engineering studies and provision of monitoring equipment

0.003/year


ES - 6


(P Billion)

Reduction of Non-revenue water NRW reduction within WSP service area 0.15/year

Water productivity measurement Financial and Economic studies and provision of monitoring systems and equipment

0.006/year

Water pricing Establishment of water pricing mechanism to be adopted by service providers and consumers

0.007/year

Metering Provision of production meters, supply meters and consumer meters

(Included in system

development costs)

Irrigation scheduling Engineering studies and provision of monitoring equipment

0.006/year

Sewerage and Septage Provision of sewerage and septage collection and treatment facilities

6.0

Medium Term Development Works (3-6 years)

Surface water development and Expansion

Abstraction from river sources and provision of treatment plant and transmission facilities as well as other necessary facilities

7.0



4.0

Rainwater/storm water harvesting and reuse

Provision of technology and designs for domestic households. Construction of impoundment reservoirs to augment supply

4.0



0.003/year



0.006/year


0.007/year


0.006/year

Long Term Development Works (6-10 years)

Surface water development and expansion


28.0

Managed aquifer storage, recharge areas, water balance

Reforestation. Protection of watershed areas. Declaration of areas as protected areas

1.0

Reduction of water pollution Management solid waste through construction of MRF, and disposal facilities. Continuing education campaign and segregation.

2.0

Water distribution system development

(a) Provision of Level I water supply systems, (b) provision of Level II water supply systems and

2.0


ES - 7


(P Billion)

(iii) provision of Level III water supply systems and expansion of existing area coverage



0.003/year



0.006/year


0.007/year


0.006/year


1-1

CHAPTER 1 INTRODUCTION

Integrated Water Resources Management (IWRM) is a collaborative process which

promotes the coordinated development and management of water, land and related

resources within hydrological boundaries, in order to maximize the resultant economic

and social welfare in an equitable manner without compromising the sustainability of vital

ecosystems.1 IWRM is based on the following principles:2

1. Water is a human right and the government has an obligation to respect, protect

and fulfill the enjoyment of the right to water.

2. Water is a finite and vulnerable resource, essential to sustain life, development

and the environment. It should be managed for the common good.

3. Access to water should be equitable and sensitive to gender and the

disadvantaged.

4. The governance of water resources should be transparent and socially

accountable and its management should be decentralized at the lowest possible

level.

5. Water supply services should be financially sustainable and socially acceptable.

6. Water supply services should be demand responsive. This includes

appropriateness and viability of technology and management options at various

levels.

7. Water supply projects should have capacity development components at all

levels inclusive of knowledge management that promotes a learning environment

for all stakeholders.

8. Water supply provision should be a priority component in poverty reduction

programs. This means giving priority to public allocation for water supply

services.

9. Sanitation is directly linked to water supply.

10. The development of the water supply sector should contribute to the promotion of

gender equality.

The IWRM Plan Framework is a directional plan. It is intended to guide the different

stakeholders involved in water resources management, at different levels, to either

prepare their respective IWRM plans, update/enhance their existing IWRM related plans

or make IWRM an integral part of their development plans/programs. This directional

plan framework also seeks to enable and encourage a wider adoption and localization of

IWRM, across different stakeholders, at different levels. It will guide water-related

government agencies and other stakeholders in ensuring that water and IWRM are

mainstreamed and integrated in their respective plans, programs, and projects. It will

likewise be the take-off in the preparation of regional and local IWRM Operational and

Action Plans.3

1 National Economic Development Authority (NEDA), Philippine Water Supply Sector Roadmap 2

nd edition, 2010

2 Ibid

3 Ibid


1-2

1.1 REVIEW OF CAVITE’S PREVIOUS INITIATIVES TOWARDS INTEGRATION

The province of Cavite recognizes the need for an updated, integrated, and

comprehensive water management plan in view of the rapid growth in population,

increased economic activity, decreasing groundwater levels resulting in

groundwater mining, salt-water intrusion in coastal areas, pollution in rivers, and

competition over water rights. Hence, it encouraged the conduct of studies to

help improve the province‘s water supply system:

In 1989, the Office of the Provincial Planning and Development Coordinator

(OPPDC), with the assistance of Kampsax-Kruger, formulated the Water Supply

Sewerage and Sanitation Development Plan 1990-2000. The plan recommended

increasing the coverage of service areas to 85% by 2000. This could be

achieved by increasing the coverage of Level II and III facilities to 63% and the

installation of hand pumps (Level I) in the barangays. The main supply source for

these facilities was extracted groundwater.

In 1995, the Japan International Cooperation Agency (JICA) conducted the

Cavite Water Supply and Development Study which covered two cities and 15

municipalities under the Local Water Utilities Administration (LWUA). It -

concluded that there was insufficient water source capacity, low pump and motor

efficiency, high unaccounted water usage (49% of total monthly production) and

deficient steel reservoirs and treatment facilities. The study recommended that (i)

domestic consumption should be prioritized in the allocation of ground water

sources, (ii) establishment of a groundwater management committee under the

provincial government; (iii) examination of permissive pumping discharge and;

(iv) re-examination of regional development plans and land use plans.

The study specifically proposed groundwater supply development in the

municipalities of General Mariano Alvarez, Mendez, Naic and Tanza. In the case

of Tagaytay City, with very limited groundwater potential, it was recommended to

increase the pumping rate capacity of Kaybubutong Spring.

In 2004, the Swedish Consultancy Services International (SWECO) and

WATCON, Inc. conducted the study entitled ―Water Resources in Nine Local

Government Units in Cavite Province, Philippines.‖ The study found that

―harnessing surplus of recoverable recharge in Indang, Mendez-Nunez, Silang

and Tagaytay City could prolong water mining until 2030 but will lead to

dewatering of aquifers.‖ It added that ―groundwater withdrawal should be reduced

below recoverable charge on or before 2030, to allow aquifer replenishment.‖ The

study recommended water source development that involved: (i) addition of

production wells distributed among the nine LGUs; (ii) development of 1-2 springs

in Tagaytay City; (iii) suspension of water permits issuance in LGUs where there

is groundwater mining (i.e., Carmona, GMA, General Trias, northern Silang and

Dasmarinas.) and; (iv) initiation of measures to find new water sources by LGUs.

It also recommended institutional arrangements for the redistribution of future

wells to (i) harness surplus recoverable recharge in Amadeo, Indang, Mendez-


1-3

Nunez, Silang and Tagaytay City and (ii) find alternative water sources in

conjunction with ground water sources.

The Sangguniang Panlalawigan (SP) of Cavite passed Resolution No. 082-S-

2012 authorizing the Provincial Governor, Hon. Juanito Victor C. Remulla Jr., to

formulate an Integrated Water Resource Management Plan that envisions the

environmentally sustainable utilization of the province‘s water resources to help

meet and satisfy the water needs and requirements of the province‘s estimated

9M population by 2040.

1.2 CAVITE INTEGRATED WATER RESOURCE MANAGEMENT PLAN

The Cavite Integrated Water Resources Management Plan sets the direction for

the province to meet challenges in the water sector and meet related objectives

in its Provincial Development Plan (PDP). It also aims to ensure adequate long-

term availability and accessibility of potable water and sustainable management

of wastewater. Specifically, it aims to:

1. Assess the situation of the sector and identify issues and challenges;

2. Review previous initiatives towards integration;

3. Articulate a shared vision and formulate goals and objectives;

4. Formulate feasible strategies for achieving declared objectives, indicate

expected outcomes and translate these into program and investment

priorities;

5. Map out program components and sequence of activities in aid to financial

and investment planning;

6. Identify policy areas that need further research and development;

7. Define institutional arrangements between and among national and local

government agencies and units as well as the role of non-state organizations

and institutions; and

8. Define the sector monitoring and evaluation mechanisms.


2-1

CHAPTER 2 PROVINCIAL PHYSICAL AND SOCIO-ECONOMIC PROFILE

2.1 PHYSICAL ENVIRONMENT

2.1.1 Geographic Setting

The Province of Cavite is part of the CALABARZON Region or Region IV-A which

is located in southwestern Luzon (Figure 2.1-1). Also called the Southern

Tagalog Mainland, CALABARZON is the second most densely populated region

after the National Capital Region. It derives its name from its composite five (5)

provinces, namely: CAvite, LAguna, BAtangas, Rizal, and QueZON.

Source: NAMRIA

Figure 2.1-1 CALABARZON (Region IV-A)

Cavite lies at about 30 km south of Manila at the southwest entrance of Manila

Bay and across the Bataan Peninsula. It is bounded on the north by Manila Bay

and Metro Manila, on the south by the Province of Batangas, and on the east by

the province of Laguna. To its west lies the South China Sea (Figure 2.1-2). It is

located within latitudinal coordinates 14o 04' to 14o 35' North, and longitudinal

coordinates 120o 35' to 121o 06' East.

The province is accessible from Metro Manila through several routes that include

the Coastal Road and the newly opened Cavite Expressway, Aguinaldo Highway,

and the South Luzon Expressway. Trece Martires City, the seat of the provincial

government is about 45 km from the City of Manila.


2-2

Source: NAMRIA

Figure 2.1-2 Cavite Province and its Cities and Municipalities

Divided into seven (7) congressional districts, the province is composed of19

municipalities and four (4) cities, and has a total of 829 barangays (Figure 2.1-3

Legislative District Map). The four (4) component cities are Dasmariñas, Trece

Martires, Cavite, and Tagaytay. It also has four (4) satellite islands—Corregidor,

Caballo, Fraile, and Limbones. By virtue of Presidential Decree 1163, Imus is the

provincial capital but the seat of the provincial government is located at Trece

Martires City.

Source: NAMRIA, Cavite SEPP 2010

Figure 2.1-3 Legislative District


2-3

2.1.2 Physical Features

2.1.2.1 Physiography

The province of Cavite has a total land area of 1,427.06 square kilometers

(142,706 hectares), representing 8.72% of the CALABARZON‘s total land area.

The municipalities of Maragondon and Silang have the biggest land areas while

the municipality of Noveleta, has the smallest land area, accounting for only

0.38% of the provincial total.

The land area of the province is classified as follows: 5.9% public forests; 90.07%

alienable and disposable; and 4.02% unclassified forest land. It has four (4)

physiographical areas, namely: the lowest lowland area, the lowland area, the

central hilly area and the upland mountainous area (Figure2.1-4). The

characteristics of these areas are described as follows:

The lowest lowland area or coastal plains have extremely low ground level of

elevation 0m to 2m compared to the high tide level of about elevation 0.8m

from the Mean Sea Level (MSL). Cavite City and the municipalities of Bacoor,

Kawit, Noveleta, and Rosario, the northern part of Carmona, and eastern part

of Ternate are part of this area.

The lowland area consists of the coastal and alluvial plains. These areas

have flat ground of less than 0.5%slope and low ground elevation of elevation

2m to elevation 30m. The alluvial plain can be found in the municipality of

Imus and the southern part of General Trias. These municipalities form the

transition area between the coastal plain and the central hilly area. Some

areas of Bacoor, Kawit, Noveleta, Rosario, Tanza, and Carmona are also part

of the lowland area.

The third topography type is the central hilly area, generally found on the

mountain foot slope. This topography forms the rolling tuffaceous plateau and

includes steep hills, ridges, and elevated inland valley. The plateau is

characterized with ground elevation ranging from 30m to nearly 400m. Its

ground slope ranges from 0.5% to 2%. The cities of Trece Martires and

Dasmariñas and the municipalities of General Emilio Aguinaldo, General

Mariano Alvarez, Indang, Maragondon, Ternate, Silang, and Carmona have

this kind of topography.

The fourth topography type, the upland mountainous area, can be found in

Magallanes, Amadeo, Tagaytay City, Mendez, Alfonso, and the southern part

of Maragondon and Carmona. They are situated at a very high elevation

above 400m with slopes of more than 2%. The Tagaytay ridge has an

average elevation of 610mwith Mount Sungay having the highest elevation in

the province at 716m.

http://en.wikipedia.org/wiki/Cavite_City

http://en.wikipedia.org/wiki/Bacoor

http://en.wikipedia.org/wiki/Kawit

http://en.wikipedia.org/wiki/Noveleta

http://en.wikipedia.org/wiki/Rosario

http://en.wikipedia.org/wiki/Carmona

http://en.wikipedia.org/wiki/Ternate

http://en.wikipedia.org/wiki/Imus

http://en.wikipedia.org/wiki/General_Trias


http://en.wikipedia.org/wiki/Kawit

http://en.wikipedia.org/wiki/Noveleta


http://en.wikipedia.org/wiki/Tanza


http://en.wikipedia.org/wiki/Trece_Martires

http://en.wikipedia.org/wiki/Dasmari%C3%B1as

http://en.wikipedia.org/wiki/General_Emilio_Aguinaldo

http://en.wikipedia.org/wiki/General_Mariano_Alvarez,_Cavite

http://en.wikipedia.org/wiki/General_Mariano_Alvarez,_Cavite

http://en.wikipedia.org/wiki/Indang

http://en.wikipedia.org/wiki/Maragondon


http://en.wikipedia.org/wiki/Silang


http://en.wikipedia.org/wiki/Magallanes

http://en.wikipedia.org/wiki/Amadeo

http://en.wikipedia.org/wiki/Tagaytay_City

http://en.wikipedia.org/wiki/Mendez,_Cavite

http://en.wikipedia.org/wiki/Alfonso,_Cavite

http://en.wikipedia.org/wiki/Maragondon



2-4


Figure 2.1-4 Elevation of Cavite Province

The prominent topographic features found in the province are the Tagaytay Ridge

and the Marikina Fault. The physiography of the western side of the province is

greatly influenced by the movement of the fault. The side towards Laguna de Bay

is the downthrown block while the up thrown block is manifested by the

topographic rise westward of Tagaytay Ridge.

The most important surface water bodies near the area are the Laguna de Bay

and Taal Lake. Laguna de Bay is a shallow lake that serves as a natural

detention reservoir of discharges from the surrounding tributary streams. Surface

water originating from the eastern portions of Silang flows in an easterly direction

before emptying into the lake; while surface water at the southern half of

Tagaytay City drains into the Taal Lake, a very deep surface water body.

Rivers and streams that originate from upland areas drain into the province.

These waterways, with long and narrow drainage areas, generally flow in

northerly and northwesterly directions before emptying into the Manila Bay or the

Laguna de Bay. The major river systems include the Maragondon River, Ilang-

ilang River, Cañas River, San Juan River, and Imus River (Figure 2.1-5).


2-5


Figure 2.1-5 River Network

2.1.2.2 Vegetation and Land Use

The Province of Cavite lies at the western monsoon forest generally

characterized by tropical rainforest. As a result of deforestation and economic

developments, the tropical rainforest has been reduced to less than 10% of the

total land area. The remaining 4000-hectarerainforests in Maragondon and

Ternate were declared as national parks in 1976. Known as Mts. Palay-Palay and

Mataas na Gulod Protected Landscape, they lie on the southwestern border with

Batangas.

Agriculture comprises more than 50% of land use in the province.

Industrialization and urbanization have considerably reduced the cultivated areas.

The low lying flat areas are used as irrigated rice paddies while the central and

upland areas are used for non-irrigated rice lands, orchards, and livestock farms.

The upland areas are known for production of coffee, pineapples, bananas,

vegetables, cut flowers, and other fruit bearing trees. Figure 2.1-6 shows the

land use map of the province.


2-6

Source: Water Resources Assessment and Development Plan for Sustainable Utilization of Water

Resources in Nine (9) LGUs in Cavite Province, SWECO-WATCON, Inc. Sept.2004

Figure 2.1-6 Provincial Land Use

2.1.2.3 Soil

The Province of Cavite is composed of several soil types (Figure 2.1-7). The

lowland area of Cavite is generally composed of Guadalupe clay and clay loam. It

is characterized as coarse and granular when dry, but sticky and plastic when

wet. Its substratum is solid volcanic tuff. Guadalupe clay adobe is abundant in the

southern part of Bacoor and Imus that is bordering Dasmariñas. The soil is hard

and compact and difficult to cultivate which makes it generally unsuitable for

diverse cropping. It is very sticky when wet and granular when dry. Hydrosol and

Obando sand are found along the Bacoor Bay. The shoreline of Rosario, Tanza,

Naic, and Ternate is composed of Guadalupe sand.


http://en.wikipedia.org/wiki/Imus

http://en.wikipedia.org/wiki/Dasmari%C3%B1as


http://en.wikipedia.org/wiki/Tanza

http://en.wikipedia.org/wiki/Naic



2-7

Source: Water Resources Assessment and Development Plan for Sustainable Utilization of Water

Resources in Nine (9) LGUs in Cavite Province, SWECO-WATCON, Inc. Sept.2004

Figure 2.1-7 Provincial Soil Types

The central area principally consists of Magallanes loam with streaks of

Magallanes clay loam of a sandy texture. The eastern side of Cavite consists of

Carmona clay loam with streaks of Carmona clay loam steep phase and

Carmona sandy clay loam. This type of soil is granular with tuffaceaous material

and concretions. It is hard and compact when dry, and sticky and plastic when

wet. Guingua fine sandy loam is found along the lower part of Malabon and Ilang-

ilang River in Noveleta.

The type of soils that dominate the upland areas are Tagaytay loam and

Tagaytay sandy loam with mountain soil undifferentiated. These are found on the

south-eastern side that borders Laguna province. On the southern tip are

Magallanes clay and Mountain soil undifferentiated with an interlacing of


2-8

Magallanes clay loam steep phase. Tagaytay loam contains fine sandy materials.

It is moderately friable, and is easy to work with when moist. In an undisturbed

condition, it bakes and becomes hard when dry. On the other hand, Tagaytay

sandy loam is friable and granular. It has a considerable amount of volcanic sand

and is underlain by adobe clay. Cavite also has the Patungan sand which is

characterized as pale gray to almost white sand with a substratum of marine

conglomerates. It is found in Sta. Mercedes in Maragondon and in some of the

coastlines of Ternate.

2.1.2.4 Geology

General Geologic Features

The Province of Cavite is part of the uplifted Central Luzon mobile block. All of its

exposed rocks were deposited during the Pliocene to Quaternary times. Volcanic

rocks on the flanks of volcanic cones were mapped as Pliocene. These rocks are

unconformably overlain by water-laid and sub-aerial pyroclastic deposits, some of

which are well-bedded. Dips normally conform to the underlying depositional

surface. In general, almost all underlying surfaces are irregular in view of faulting

and the erosion of rock sequences. The rocks vary from well lithified and

massive, to loose and bedded. The general geology of the area is presented in

Figure 2.1-8.

The southern portion of Cavite which includes the elevated portions of Silang,

Tagaytay City, and Alfonso (also known as the Cavite slope) is not part of a

mountainside of a strato-volcano as many believe. It is a structural slope that was

originally formed by the tilting movement of the block with low elevation. The

contour lines around Taal Lake show irregular shapes and do not show

concentric circles like those of a strato-volcano. At the same time, no steep cliffs

can be found on the eastern, western, and southern sides of the lake unlike in the

northern portion where a steep slope of more than 600 meters was developed

into what is now known as the Tagaytay Ridge. In addition, the lower parts of the

geologic units that are present in Tagaytay City that extend down to Silang and

parts of Carmona were deposited in a marine environment as sediments can still

be found in these areas. The amount of displacement is largest at the southern

margin of the tilted block with the southern side of the Tagaytay Ridge developing

into a very steep slope with a large relative height. The eastern margin of the

tilted block coincides with the Marikina Fault which course through the property.

Because of these displacements, deposition patterns of the underlying formations

are very much disturbed and are no longer contiguous. Volcanic activities prior to

the tilting movement happened in the lowlands connecting Balayan Bay with the

Laguna Lake.


2-9

Source: Water Resources Assessment and Development Plan for Sustainable Utilization of

Water Resources in Nine (9) LGUs in Cavite Province, SWECO-WATCON, Inc. Sept.2004

Figure 2.1-8 General Geology

Basement Rocks

The deep-seated formations underlying the study area are considered collectively

as Basement. It is mainly composed of marine sediments such as sandstone,

mudstone, and limestone that are commonly found in Mt. Talipusa in

Maragondon.

Quaternary Guadalupe Formation.

The Quaternary Guadalupe Formation is composed of pyroclastic and

sedimentary units which crop out along the rolling hills west of the Marikina Fault.

The Guadalupe Formation underlies the alluvium in the northern portion of the

entire province. It consists of clastic debris and tuffaceous sedimentary rocks

which are of volcanic origin. The foothills and the portions covered by these

formations are largely composed of fractured tuff. Lithologic descriptions of well

logs drilled in the area are often described as layers of volcanic tuff, volcanic ash,

pumice, and other volcanic derived clastic deposits.

The thickness of the Guadalupe Formation is estimated to range from 1,300 to

2,000 meters. It forms a huge groundwater basin containing several connected


2-10

and inter-related aquifers made up of tuffaceous sandstone and conglomerate.

Groundwater recharge occurs in the western terrace contiguous to Tagaytay City.

In the Cavite Water Supply and Development Study conducted by JICA in 1995,

this formation was locally referred to as the Kaybubutong Formation which is

subdivided as:

a) Upper Kaybubutong member (Kau) - composed of pumice, scoria, and mudflow deposits.

b) Middle Kaybubutong member - made-up of andesitic lava, mudflow, and scoria.

c) Lower member (Kal) - consists of tuffaceous sand, gravel, and silt. The thickness of the Kaybubutong Formation ranges from 100 – 350 meters.

The Kaybubutong Formation is characterized by coarse-grained volcanic fall

deposits in the southern area, while sand, gravel, and silt are found in the

northern area. The reworked pyroclastic deposits and the uncemented

sequences show the most relevant hydrologic properties as water-bearing

deposits. They vary from fine ash deposits to pyroclastic materials consisting of

fine to coarse-grained sand. Randomly, cobbles and boulders may occur. Water

can be exploited from these deposits as evidenced by several productive wells

tapping mostly the lower member. The large pore space in many coarse-grained

rocks provides storage for a big volume of water. The porosity of tuff and

tuffaceous sandstone ranges from less than 5% to a maximum of 30%. Variation

in permeability is controlled chiefly by differences in the grain size of the tuff or

tuffaceous sandstone. Also, reduction in permeability is caused by the closer

packing of grains in the rock and restriction of the pore space by the presence of

cementing materials.

Firmly cemented tuff and tuffaceous sandstone with lower porosities and

permeabilities can also yield water to wells along fractures. The most favorable

areas for the development of groundwater are along fault zones and within

thoroughly jointed zones. Also, better wells are found in broad valleys and on flat

upland areas than on hill crests and valley slopes. The permeability of rocks

generally decreases with depth.

Alluvium (QAL)

The alluvium is distributed in the coastal areas of Manila Bay. It is mainly

composed of soft clay, loose sand, and gravel. The alluvium generally forms a

phreatic aquifer in the coastal areas. The thickness of the alluvium varies as well

as the size of the sediments. Exact determination of the thickness of the alluvium

is hard because of the difficulty in distinguishing it from the underlying pyroclastic

sediments.

Moderate well yields can be obtained from almost all wells drilled in the alluvium,

with much larger yields available where the thickness of the permeable zones is

bigger. Areas that are largely deposited with clay and silt are to be avoided and


2-11

areas near sources of recharge that have greater thickness of saturated sand and

gravel must be located.

2.1.2.5 Seismicity

Based on records of past earthquakes, the area can be affected by the following

geologic structures (Figure 2.1-9):

a) Lubang Fault – This fault is located approximately 100 km SW of the site and is the second closest earthquake generator to the area. Historical records show that this fault is seismically active but is unlikely to generate strong earthquakes due to its high level of seismicity, as indicated by frequent stress releases through small magnitude tremors.

b) Philippine Fault Zone – This is a major fault measuring approximately 1,300 km and is the source of the most destructive tremors, most specifically the ones that produced the July 16, 1990 earthquake. The nearest segment to the project site is located approximately 100 km east and maybe the epicenter of future earthquakes.

c) Manila Trench – This structure is a subduction zone where the China Sea Plate is slipping beneath the Philippine Plate. It is located approximately 200 km west of the project site and is believed to be the origin of tsunamigenic earthquake.

Source : PHILVOCS

Figure 2.1-9 Active Faults and Trenches


2-12

Another possible generator of earthquakes in the province of Cavite is the West

Valley Fault System (also known as the Marikina Fault). It is a north-south

trending active fault in the Metro Manila district (Figure 2.1-10). The Valley Fault

System (VFS) consists of two (2) parallel faults, namely, the West Valley Fault

and the East Valley Fault, which form a pull-apart basin. The Valley Fault System

trends N 20-40° E with near vertical dips. The trace of the West Valley Fault

extends north of Montalban in western Rizal province and passes east of Metro

Manila to the south, possibly as far as Tagaytay Ridge.

Source : PHILVOCS

Figure 2.1-10 West Valley Fault


2-13

2.1.3 Meteorology

2.1.3.1 Climate

The study area is characterized by Type IClimate under the Modified Corona Classification System (Figure 2.1-11). The System is classified into four (4) types

depending on rainfall distribution and pattern described as follows:

a) Type I: Two pronounced seasons. Dry from November to April, and wet during the rest of the year.

b) Type II: No dry season with very pronounced rainfall from November to April and wet during the rest of the year.

c) Type III: Seasons are not very pronounced, relatively dry from November to April and wet during the rest of the year.

d) Type IV: Rainfall is more or less evenly distributed throughout the year

Source: PAGASA

Figure 2.1-11 Climate of the Philippines and Frequency of Typhoons

2.1.3.2 Temperature and Relative Humidity

The temperature and relative humidity of the study area can both be described by

the data obtained from the Sangley Point and Ambulong stations presented in

Table 2.1-1 below.


2-14

Table 2.1-1 Temperature and Relative Humidity, Sangley Point and Ambulong Stations

Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Temperature, C ° Sangley Point, Cavite

Max 30.0 30.8 32.7 34.4 34.1 32.8 31.7 31.3 31.4 31.4 31.1 30.0 31.8

Min 23.3 23.6 24.6 25.9 26.1 25.8 25.3 25.2 25.2 25.3 25.0 23.9 24.9

Mean 26.6 27.2 28.6 30.1 30.1 29.3 28.5 28.3 28.3 28.4 28.1 27.0 28.4

Rel. Humidity 79 76 74 71 74 78 81 83 82 81 80 79 78

Temperature, C ° Ambulong, Batangas

Max 30.4 31.6 33.2 34.5 33.9 32.5 31.4 31.0 31.4 31.6 31.4 30.2 31.9

Min 22.2 22.1 22.9 23.9 24.6 24.6 24.1 24.3 24.1 23.9 23.6 22.8 23.6

Mean 26.3 26.9 28.1 29.2 29.2 28.6 27.8 27.6 27.8 27.7 27.5 26.5 27.8

Rel. Humidity, % 79 77 74 73 76 80 83 84 84 83 81 80 80

Source: PAGASA

Monthly temperature ranges from a minimum of 22°C to a maximum of 35°C.

Mean monthly temperature varies little around the year, from 26°C to 30°C, with

an annual temperature averaging 28°C. The coldest months are from December

to February, while the hottest months are April and May. Mean. The mean

relative humidity is highest in August and September at 84%.

2.1.3.3 Evaporation

The mean daily evaporation rate for the Province (Table 2.1-2), reckoned from

the Tagaytay City station, averages 3.87 mm/day, with the lowest occurring in

December and the highest occurring in April.

Table 2.1-2 Average Daily Evaporation Rate, Tagaytay City Station

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Mean 3.7 4.2 4.4 5.5 4.7 3.9 3.5 3.3 3.2 3.4 3.4 3.2 3.9

Stdev 0.7 0.6 1.8 1.0 0.9 0.6 0.4 0.6 0.3 0.4 0.5 0.5 0.4

Median 3.7 4.3 4.8 5.5 4.9 3.8 3.5 3.2 3.2 3.4 3.2 3.1 3.8

Cv 0.18 0.14 0.42 0.18 0.20 0.16 0.11 0.17 0.11 0.13 0.16 0.15 0.10

Source: PAGASA

2.1.3.4 Winds

The prevailing wind direction conforms with the dominant air stream during the

different months. The northerly winds affect the project area from November to

January with an average speed of 2.3 m/s. From May to October, the prevailing

winds are from the southwest with an average speed of 3.0 m/s. Other wind

directions occur less frequently. Each year the Philippines experiences several

typhoons with destructive winds and torrential rains. The monthly normal and

extreme wind speed and direction, taken from the Sangley Point and Ambulong

Stations, are detailed in Table 2.1-3.


2-15

Table 2.1-3 Monthly Normal and Extreme Wind Speed and Direction, Sangley Point and Ambulong Stations

Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual

Normal¹ Sangley Point, Cavite

Wind Speed, mps

3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0

Wind Direction

ESE ESE ESE ESE ESE ESE W SW W ESE ESE ESE ESE

Extreme²

Wind Speed, mps

17 15 24 16 27 23 54 30 44 45 49 22 54

Wind Direction

ESE ESE ESE ESE SW NW E W NNW NW NW NNW E

Normal¹ Ambulong, Batangas

Wind Speed, mps

2 2 2 1 1 1 1 2 1 1 2 2 2

Wind Direction

NE NE NE NE NE SW SW SW SW NE NE NE NE

Extreme²

Wind Speed, mps

20.0 24.0 22.0 18.0 41.0 40.0 75.0 40.0 54.0 70.0 45.0 54.0 75.0

Wind Direction

ENE NE ENE SE SW SW W NNE SSW S NE NE W

Source: PAGASA Notes:

1 Period of Record: 1981-2010 2

Period of Record: 1950-2010

2.1.3.5 Tropical Cyclones

The presence of Tropical cyclones is the most influential factor that brings

considerable rainfall to the Philippines. Typhoons usually occur from June to

December with the highest frequencies in July and August. The cyclones

originate from the region of Marianas and Caroline Islands in the Pacific Ocean,

usually between 125°E and 170°E. Their movements follow a westerly or

northwesterly course over the country and deposit substantial amounts of rainfall.

The most frequent disastrous typhoons generally occur during the months of

September through November.

The Philippines is a typhoon-prone area. During the past 53-year period from

1948-2000, a total of 1,038 tropical cyclones crossed the Philippine Area of

Responsibility with Cavite experiencing 2 tropical depressions, 11 tropical storms,

and 11 typhoons. The province ranked as the 40th most visited by this weather

system.

The country experiences an average of 19.6 typhoons a year in its area of

responsibility. The normal high incidence of typhoons brings in heavy rains when

it coincides with the southwest monsoon occurrence from June to September.


2-16

Storm surges accompany tropical depressions and cause extreme flood

occurrences. They devastate many low-lying coastal areas. Studies at selected

stations in the Philippines have shown that 47% of the average yearly rainfall is

due to tropical cyclones, 14% to monsoons, and 39% to other weather

disturbances such as thunderstorms, easterly waves, International Tropical

Convergence Zones (ITCZ), and fronts.

2.2 INFRASTRUCTURE

2.2.1 Transportation

The primary mode of transport in the province of Cavite is via the network of

national, provincial, city/municipal, and barangay roads, totaling about 2,186.46 km

long. National roads link Cavite with its neighboring provinces while provincial

roads form a network among the different municipalities and cities within it.

About18.71%of the total road length are national roads, 16.91% are provincial

roads, 14.9% are city/municipal roads, and the remaining 49.48%are barangay

roads. 87.37% of the city/municipal roads are concrete, while most of the

barangay roads are combinations of concrete and earth.

Cavite has six (6) major entrances and exits, namely : (i) the Aguinaldo Boulevard

(Manila-Cavite Coastal Road), (ii)South Luzon Expressway (SLEX) in Carmona,

the (iii) Aguinaldo Highway (Batangas-Alfonso-Tagaytay Road), (iv) Zapote-Las

Piñas Road, (v) Sta .Rosa-Tagaytay Road, and (vi) Alabang-Molino via Daang Hari

Road.

There are 323 bridges with a total length of 6,319.48 m which connect roads in the

different cities and municipalities of the province. About 200 of these bridges with a

combined length of 5,700m are permanent, while the remaining 36 with a

combined length of about 650m are considered temporary structures.

Major land transport projects in the pipeline which will impact the province are the

Cavite-Laguna National Road Project and Light Rail Transit (LRT)-Line1 South

Extension. The CALA Road Project consists of two (2) components - the 27.2 km.,

6-lane North-South Road from Bacoor, Cavite to Sta. Rosa Laguna and the 24.3

km. East-West Road that extends Daang Hari Road eastward to SLEX and

westward to Tanza, Cavite. The LRT Line 1 South Extension project extends from

Baclaran to Bacoor, Cavite.

2.2.2 Communication

The telephone service providers in the province are the Philippine Long Distance

Telephone Company (PLDT), Digital Telecommunications Philippines,

Inc.(DIGITEL), and Globe Telecommunications. PLDT is the biggest service

provider in terms of landline telephone service with a market share of 44.99%in

2010.


2-17

In terms of other services, Smart Communications has the most number of cell

sites in the province, followed by Globe Telecom, Inc. and the Sun Cellular

Network, which is powered by Digitel Mobile Philippines. The Philippine Telegraph

and Telephone Company (PT & T), Radio Communications of the Philippines, Inc.

(RCPI), LBC Express, Inc., and DHL Forwarder also perform specific

telecommunication and courier services throughout the province. There is a limited

number of local radio stations in Cavite due to its proximity to Metro Manila.

For postal services, the Philippine Postal Corporation has 34 post offices in the

province, as of 2010, that are responsible for posting and delivering both domestic

and international mail.

2.2.3 Water Supply

Generally, the entire province of Cavite has access to clean and safe water

delivered by public and private service agencies (12 Water Districts, 2 LGU-

managed and 4 private suppliers). Private subdivisions and Barangays which are

not covered by those agencies have their own water systems, provided by the

respective homeowners associations and barangay waterworks and sanitation

associations (BWSAs). The province sources its water supply mainly from

groundwater through wells and springs. While springs are commonly used in the

upland and rural areas, all others use deepwells as the traditional water source.

The three levels of service recognized in domestic waterworks (Box 2.1) are found

in the entire province.

Box 2.1 Level of Service in Waterworks

The water supply service coverage per city and municipality based on the 2009

data from the Provincial Health Office is shown in Table 2.2-1. Level I facilities exist

in almost the entire province, except in the municipalities of Carmona, Gen.

Mariano Alvarez and Magallanes. Level II systems can be found in Rosario, Silang,

Based on NEDA Board Resolution No. 5, series of 1998, water service levels are classified

into three (3) types, based on the method by which water is collected by households.

These three levels are :

a) Level I, a point source, consists of a protected well or a developed spring with an outlet, but without a distribution system. It normally serves an average of 15 households within a radius of 250 meters and is found in rural areas due to its affordability and the dispersion of houses. Travel to the source is necessary to collect water.

b) Level II, a communal faucet system or stand post, is generally suited for rural and urban fringe areas where the clustering of houses in sufficient density makes a simple piped system practicable. One (1) faucet usually serves four (4) to six (6) households within a radius of 25 meters. Travel is still necessary to collect water.

c) Level III consists of a source, a reservoir, a piped distribution network, and individual household taps. It is suited for densely populated urban areas where the population can afford individual connections.


2-18

Tagaytay, Alfonso, Gen. Aguinaldo, Indang, Magallanes, and Naic. Level III service

on the other hand is available in all the cities and municipalities except Gen.

Aguinaldo, with service coverage per city/municipality ranging from 12% in Ternate

to 100% in Carmona and Gen. Mariano Alvarez (Figure 2.2-1).

Table 2.2-1 Water Supply Service Coverage by City/Municipality

CITY/ MUNICIPALITY

LEVEL I LEVEL II LEVEL III TOTAL

No. of HH % No. of HH % No. of HH %

District I 12,469 23.73 1,004 1.91 39,065 74.36 52,538

Cavite City 2,694 12.00 19,760 88.00 22,454

Kawit 3,775 31.50 8,210 68.50 11,985

Noveleta 3,019 48.40 3,218 51.60 6,237

Rosario 2,981 25.13 1,004 8.46 7,877 66.41 11,862

District II 31,434 43.40 40,995 56.60 72,429

Bacoor 31,434 43.40 40,995 56.60 72,429

District III 17,968 44.78 22,161 55.22 40,129

Imus 17,968 44.78 22,161 55.22 40,129

District IV 115 0.12 94,130 99.88 94,245

Dasmariñas City 115 0.12 94,130 99.88 94,245

District V 97 0.15 2,631 4.01 62,946 95.85 65,674

Carmona 11,340 100.00 11,340

Gen. M.Alvarez 22,010 100.00 22,010

Silang 97 0.30 2,631 8.14 29,596 91.56 32,324

District VI 13,216 15.98 69,481 84.02 82,697

TreceMartires 226 2.40 9,186 97.60 9,412

Amadeo 6 0.12 5,006 99.88 5,012

Gen. Trias 5,807 14.60 33,969 85.40 39,776

Tanza 7,177 25.19 21,320 74.81 28,497

District VII 10,977 18.42 7,224 12.12 41,397 69.46 59,598

Tagaytay City 297 2.93 716 7.07 9,120 90.00 10,133

Alfonso 121 1.60 45 0.59 7,402 97.81 7,568

Gen. Aguinaldo 20 0.71 2,811 99.29 2,831

Indang 235 2.45 1,424 14.82 7,949 82.73 9,608

Magallanes 1,532 53.42 1,336 46.58 2,868

Maragondon 1,164 22.20 4,080 77.80 5,244

Mendez 180 4.30 4,004 95.70 4,184

Naic 6,109 43.90 696 5.00 7,111 51.10 13,916

Ternate 2,851 87.83 395 12.17 3,246

TOTAL 86,276 18.46 10,859 2.32 370,570 79.30 467,310

Source: Cavite SEPP, 2009


2-19

Source: Cavite SEPP, 2009

Figure 2.2-1 Level III Water Service Coverage (2009)

2.2.4 Existing Water Service Providers

The existing water service providers are the water districts, Local Government

Units (LGU), Maynilad Water Services, Inc. (MWSI), and small water service

providers which sell in bulk or through individual house connections. Water Districts

under the Local Water Utilities Administration (LWUA) supply 3 cities and nine (9)

municipalities, namely:

a) Tagaytay City b) Trece Martires City c) Dasmarinas City d) Amadeo e) Carmona f) Gen. Emilio Aguinaldo g) Gen Mariano Alvarez h) Indang i) Maragondon j) Mendez k) Silang l) Tanza


2-20

Private corporations that operate as water service providers include: (i) General

Trias Water Corporation in Gen. Trias, (ii) Naic Water System Corporation in

Naic, and (iii) Western Cavite Water Supply and Service Corporation in Ternate.

The municipal governments of Alfonso and Magallanes manage their respective

water supply systems. The details of the existing water supply facilities are shown

in Annex II-1.

The existing water rate schedule of each water service provider is shown in Table

2.2-2. For the 12 water districts, the minimum charge (first 10 m3) for residential

connections ranges from P158 in Dasmariñas City to P280.00 in General Mariano

Alvarez. The average minimum monthly charge is P198.29.

Table 2.2-2 Existing Water Rates

(11-20 m3) (21-30 m3) (31-40 m3) (41-50 m3) (Over 50 m3)

District I

Cavite City Maynilad Water Services, Inc. 129.07 15.77 29.97 29.97 39.36 39.36 1/1/2012

Kawit Maynilad Water Services, Inc. 129.07 15.77 29.97 29.97 39.36 39.36 1/1/2012

Noveleta Maynilad Water Services, Inc. 129.07 15.77 29.97 29.97 39.36 39.36 1/1/2012

Rosario Maynilad Water Services, Inc. 129.07 15.77 29.97 29.97 39.36 39.36 1/1/2012

District II

Bacoor Maynilad Water Services, Inc. 129.07 15.77 29.97 29.97 39.36 39.36 1/1/2012

District III

Imus Maynilad Water Services, Inc. 129.07 15.77 29.97 29.97 39.36 39.36 1/1/2012

District IV

Dasmariñas City Dasmariñas Water District 158.00 19.00 22.80 26.80 30.85 30.85 6/23/2011 8/1/2011

District V

Carmona Carmona Water District 238.60 26.20 29.00 32.60 37.00 37.00 3/16/2004 4/1/2006

Gen. M. Alvarez Gen. M. Alvarez Water District 280.00 29.65 32.35 35.70 40.65 40.65 6/23/2011 8/1/2011

Silang Silang Water District 210.85 22.80 25.15 28.10 31.60 31.60 5/19/2009 1/1/2011

District VI

Trece Martires City Trece Martires Water District 170.00 18.25 19.55 20.90 23.50 23.50 7/8/2008 1/1/2010

Amadeo Amadeo Water District 195.00 28.00 30.00 33.00 37.00 37.00 3/15/2005 2/1/2009

Gen. Trias Gen. Trias Water Corporation

Tanza Tanza Water District 180.00 18.30 19.45 20.90 23.25 23.25 2/3/2009 1/1/2011

District VII

Tagaytay City Tagaytay City Water Dsitrict 233.00 25.80 28.55 31.80 35.30 35.30 2/15/2005 1/1/2011

Alfonso Alfonso Waterworks Office(1st 8 m3)

50.00

Gen. Emilio Aguinaldo Gen. E. Aguinaldo Water District 163.00 17.30 19.70 23.45 27.60 27.60 6/4/2003 1/1/2006

Indang Indang Water District 188.00 22.25 24.90 27.25 27.25 27.25 2/23/2010 4/1/2010

Magallanes Magallanes Waterworks Office 70.00

Maragondon Maragondon Water District 168.00 18.00 19.00 21.50 24.00 27.00 7/27/2010 9/1/2010

Mendez Mendez Water District 195.00 21.50 24.00 27.25 30.75 30.75 6/19/2002 2/1/2006

Naic Naic Water Supply Corporation 120.00 13.00 13.00 13.00 13.00 13.00

TernateWestern Cavite Water Supply and

Services Corp.144.00 15.50 17.00 19.00 21.50 24.50

AVERAGE Water Districts only 198.29 22.25 24.54 27.44 30.73 30.98

Provincial 160.81

City/ Municipality

12.00/m3 ( In excess of 8 m3)

Date AppliedDate

Implemented

Commodity ChargesMinimum Charge

(1st 10 m3)Water Utility/Service Provider

Source: LWUA, MWSI, Cavite PPDO

For LGUs and private corporations, the minimum charge ranges from P50.00 in Alfonso to P144.00 in Ternate. MWSI charges P129.07 for the first 10 m3. The aggregate maximum production capacity of the water agencies serving the

province of Cavite corresponding to a total of 293 pumping stations is estimated

at 303,397.34 cu.m./day. Table 2.2-3 provides a breakdown of the estimated

maximum water production capacity per concerned water agency.


2-21

Table 2.2-3 Estimated Maximum Water Production Capacity Per Water Agency

Water Agency Number of Pumping Stations

Maximum Production Capacity (cu.m./day)

1. Alfonso Waterworks Office 3 1,898.00

2. Amadeo Water District 10 3,123.00

3. Carmona Water District 10 14,136.04

4. Dasmariñas Water District 108 144,n123.43

5. Gen. Aguinaldo Water District* 3 2,643.84

6. GMA Water District** 14 10,354.38

7. Indang Water District 10 5,733.53

9. Magallanes Water district NA NA

10. Maragondon Water District 5 5,703.00

11. Maynilad Water Services, Inc. * 17 12,989.00

12. Mendez Water District 7 3,869.00

8. Naic Water Supply Corporation** 4 124.19

13. Silang Water district 60 39,892.30

14. Tagaytay Water District 15 23,022.00

15. Tanza Water District 6 7,779.67

16. Western Cavite Water Supply & services Corporation* 1

13,750.00

17. TMC Water District 20 14,255.96

Total 293 303,397.34

Source: PPDO, Naic Water Supply Corporation; NA – not available

2.2.5 Sanitation and Sewerage

As determined by the 2000 NSO Census Survey, 92.16% of the households in

Cavite have adequate sanitation facilities (Table 2.2-4). However, there is no

existing piped wastewater collection in Cavite, nor are there any treatment

facilities for septage. The 2000 Census data indicate that, for households with

water-sealed toilets, 74.68% discharge their excreta waste into septic tanks,

while 17.48% discharge their waste into vaults or other depositories. Septic tank

effluent is generally allowed to leach into the ground. Some are discharged into

nearby drains, ditches, or watercourses.

There are no public sewerage systems in Cavite. Most households in urban

centers dispose of their wastewater through septic tanks which pass effluents

directly into street canals or adjacent watercourses.

In agricultural areas, water-sealed latrines which discharge their contents into a pit

are widely used. However, many toilets are flushed directly into watercourses, rice

fields, and drains. Ground water pollution becomes a serious issue, particularly in

coastal areas where the ground water table is relatively high.


2-22

Table 2.2-4 Inventory of Sanitation Facilities by City/Municipality

% No. of HH % No. of HH % No. of HH % No. of HH % No. of HH % No. of HH % No. of HH % No. of HH

CITIES

DASMARINAS CITY 77,315 23 63,893 10 6,465 6 3,627 2 1,422 1 899 0.64 412 0.27 174 0.66 423

TRECE MARTIRES CITY 8,761 2 6,146 12 707 18 1,096 4 271 1 66 2.21 136 2.2 135 3.32 204

CAVITE CITY 21,342 5 13,142 17 2,182 15 1,931 7 975 7 907 4.79 629 3.61 474 8.39 1,102

TAGAYTAY CITY 8,590 2 5,907 12 695 10 579 2 141 15 867 3.86 228 0.78 46 2.15 127

MUNICIPALITIES

ALFONSO 8,045 2 5,335 15 814 21 1,125 5 248 6 340 1.12 60 - - 2.31 123

AMADEO 5,470 1 3,544 7 262 36 1,265 3 116 5 169 2.4 85 0.28 10 0.54 19

BACOOR 64,067 15 41,104 17 6,793 18 7,434 10 3,908 4 1,654 1.53 628 3.09 1,270 3.1 1,276

CARMONA 10,430 2 5,580 12 687 52 2,884 9 490 4 217 7.42 414 1.11 62 1.72 96

GEN. E. AGUINALDO 2,765 1 1,686 9 148 35 587 7 116 3 49 4.33 73 1.07 18 5.22 88

GEN. TRIAS 23,299 5 14,364 21 2,975 26 3,671 8 1,126 2 340 0.88 126 0.44 63 4.41 634

IMUS 42,232 10 29,099 7 1,996 25 7,194 9 2,632 1 261 0.32 94 2.78 809 0.51 147

INDANG 10,608 3 7,255 15 1,091 16 1,139 7 530 1 82 1.83 133 - - 5.21 378

KAWIT 13,510 3 9,213 17 1,546 11 1,044 4 386 6 597 2.44 225 4.05 373 1.37 126

MAGALLANES 3,422 1 1,490 21 306 70 1,049 3 52 19 290 6.24 93 0.40 6 9.13 136

MARAGONDON 6,282 1 3,657 15 554 14 527 7 262 5 172 0.79 29 4.32 158 25.24 923

MENDEZ 4,758 1 3,949 13 515 3 109 4 144 1 22 0.25 10 - - 0.23 9

NAIC 15,230 2 6,850 21 1,415 46 3,119 17 1,156 12 823 6.61 453 10.86 744 9.78 670

NOVELETA 6,934 1 3,813 10 395 43 1,622 11 416 3 127 2.05 78 8.71 332 3.96 151

ROSARIO 15,780 2 6,987 23 1,632 30 2,088 31 2,175 15 1,074 2.33 163 14.66 1,024 9.12 637

SILANG 30,847 7 18,512 15 2,783 26 4,836 8 1,406 6 1,063 4.92 911 4.40 814 2.82 522

TANZA 23,059 4 11,517 11 1,313 46 5,296 18 2,048 10 1,166 4.61 531 2.35 271 7.96 917

TERNATE 3,541 0 1,325 36 474 51 682 21 283 31 413 3.62 48 4.45 59 19.4 257

GMA 22,592 6 17,042 18 3,117 7 1,276 3 480 1 233 1.48 252 0.52 89 0.6 103

Total 428,879 65.62% 281,410 9.06% 38,865 12.63% 54,180 4.85% 20,783 2.76% 11,831 1.35% 5,811 1.62% 6,931 2.11% 9,068

Source: National Statistics Office, 2000

None

KIND OF TOILET FACILITY

CITY/MUNICIPALITYTotal

Household

Others

(Pail System, etc.)

Water-sealed,

Sewer/Septic Tank,

used exclusively by

households

Water-sealed,

Sewer/Septic Tank,

shared with other

households

Water-sealed, other

Depository used

exclusively by

households

Water-sealed, other

Depository shared

with other

households

Closed Pit Open Pit


2-23

2.2.6 Solid Waste Disposal Systems

As of 2010, only Dasmariñas City and Tagaytay City have a centralized material

recovery facility (MRF) while only 14 municipalities were able to implement the

MRF system in their respective barangays. Waste that can no longer be recycled,

also known as residual waste, is disposed of in dumpsites or sanitary landfills.

There are five (5) open dumpsites that can be found in Rosario, Gen. M. Alvarez,

Gen. Aguinaldo, Indang, and Maragondon. These are considered unsanitary

because of the presence and accumulation of uncontrolled hazards to health and

sanitation.

On the other hand, controlled dumpsites are those that are monitored by the

municipal government. Even though the area is secured, health hazards through

leachate are still present and remain unaddressed. In 2010, there were10

controlled dumpsites allover Cavite that serve as main disposal sites of residual

waste. The waste disposal sites per city/municipality are tabulated in Table 2.2-5

and correspondingly shown in Figure 2.2-2.

Although it‘s not yet operational, an Environmental Compliance Certificate (ECC)

has already been issued to a Sanitary Landfill with Material Recovery Facility in

Ternate which is expected to accommodate and manage the solid waste produced

by both domestic and industrial sectors of the Province.

Industrial waste is segregated and disposed of through the companies‘ respective

solid and wastewater disposal and treatment facilities. According to the records of

PG-ENRO, there are 17 companies which offer special treatment of hazardous and

infectious waste in Cavite.

Figure 2.2-2 Solid Waste Disposal Map


2-24

Table 2.2-5 Cavite Province Disposal Sites, 2010

Location Area, ha Type Capacity Status

CITIES

DASMARINAS CITY Brgy. Salawag 6.00 Controlled Dumpsite - Operating

TRECE MARTIRES CITY Brgy. De Ocampo 0.50 Open Dumpsite 4.8 tons -

CAVITE CITY San Pedro, Laguna - Open Dumpsite 60 tons Operating

TAGAYTAY CITY San Pedro, Laguna - By Contract / Sanitary Landfil l 41 tons -

MUNICIPALITIES

ALFONSO Brgy. Marahan I 0.40 Controlled Dumpsite 18.88 m3 Operating

AMADEO - Controlled Dumpsite 12.00 m3 Closed

BACOOR San Pedro, Laguna - By Contract / Sanitary Landfil l - -

CARMONA San Pedro, Laguna - By Contract / Sanitary Landfil l 10-15 tons -

GEN. E. AGUINALDO Brgy. Lumipa 1.25 Open Dumpsite - Operating

GEN. TRIAS Brgy. Tapia 1.50 Open Dumpsite 200 m3 Operating

IMUS Brgy. Pasong Buaya 1.37 By Contract / Sanitary Landfil l 150 m3 -

INDANG Brgy. Banaba Lejos 4.70 Controlled Dumpsite 24 m3 Operating

KAWIT 0.01 Open Dumpsite - Operating

MAGALLANES Brgy. Kabulugan, Caluangan, Urdaneta - Open Dumpsite - -

MARAGONDON Brgy. Layong Mabilog 1.60 Controlled Dumpsite 9,000 m3 Operating

MENDEZ Brgy. Asis II (Eco-center) 0.75 Controlled Dumpsite 78 m3 Operating/Under-going Rehabilitation

NAIC Brgy. Sabang 1.30 Controlled Dumpsite 10-12 tons Operating/Under-going Rehabilitation

NOVELETA Poblacion, Noveleta 0.15 Open Dumpsite 2 tons Operating

ROSARIO San Pedro, Laguna - By Contract / Sanitary Landfil l - -

SILANG Brgy. Lalaan I 1.20 Controlled Dumpsite 12-15 tons Operating/Under-going Rehabilitation

TANZA Brgy. Sahud-Ulan 5.00 Open Dumpsite 60 tons Operating

TERNATE Brgy. Sapang II 3.00 Controlled Dumpsite 7.072 m3 Operating/Under-going Rehabilitation

GMA Brgy. Poblacion 5 0.07 Controlled Dumpsite 20-30 tons Operating

Source: Provincial Government Environment and Natural Resources Office

EXISTING DUMPSITECITY / MUNICIPALITY


2-1

2.3 SOCIO-ECONOMIC AND DEMOGRAPHIC ENVIRONMENT 2.3.1 Population, Density and Growth Rate

Cavite‘s population reached 3.09 million in 2010, making it the most populated

province in the country. It experienced an annual growth of 4.12%, dramatically

increasing its population by 49.8% from 2.06 million in 2000. This pace of growth

is more than twice the national average growth rate of 2% per year and is an

indication of a strong migration pattern into the province. The observed in-

migration is brought about by two factors, namely : (i) the presence of affordable

housing in suburban areas that is highly accessible to the central business

districts of Metro Manila; and,2) increased job opportunities due to the growing

presence of industrial estates.

Districts IV, VI and II are the three most populated districts, accounting for 53.8%

of the total provincial population in 2010. Districts VI and II have been growing

very rapidly, at 7.2% and 5.5% respectively, in view of the industrialization

activities prevailing in the area. Table 2.3-1 shows a cross-section of provincial

population, disaggregated growth rates, and population density in 2000 and

2010.

Table 2.3-1 Cavite: Population and Population Density, by City/Municipality, 2000-2010

City/ Municipality Land Area

(ha)

Population (‘000) Population growth

2000-2010 (%p.a.)

Density: 2010

(P/ha) 2000 2010

District I 3,631 267.7 313.2 1.6 86.3

Cavite City 1,183 99.4 101.1 0.18 85.5

Kawit 1,340 62.7 78.2 2.23 58.4

Noveleta 541 32.0 41.7 2.69 77

Rosario 567 73.7 92.2 2.28 162.7

District II 5,240 305.7 520.2 5.5 99.3

Bacoor 5,240 305.7 520.2 5.46 99.3

District III 9,701 195.5 301.6 4.43 31.1

Imus 9.701 195.5 301.6 4.43 31.1

District IV 8,234 379.5 575.8 4.26 69.9

City of Dasmariñas 8,234 379.5 575.8 4.26 69.9

District V 19,671 316.4 427.0 3.0 21.7

Carmona 3,092 47.9 75.0 4.59 24.3

Gen. M. Alvarez 938 112.4 138.5 2.11 147.7

Silang 15,641 156.1 213.5 3.18 13.6

District VI 30,105 285.6 570.1 7.2 18.90

Trece Martires City 3,917 41.6 104.6 9.64 26.7

Amadeo 4,790 25.7 33.5 2.66 7.0

Gen. Trias 11,768 107.7 243.3 8.49 20.7

Tanza 9,630 110.5 188.8 5.50 19.6

District VII 66,124 312.7 382.7 2.00 5.80

Tagaytay City 6,615 45.3 62.0 3.20 9.4


2-2

City/ Municipality Land Area

(ha)

Population (‘000) Population growth

2000-2010 (%p.a.)

Density: 2010

(P/ha) 2000 2010

Alfonso 6,460 39.7 48.6 2.04 7.5

Gen. Aguinaldo 5,103 14.3 17.5 2.03 3.4

Indang 8,920 51.3 62.0 1.92 7.0

Magallanes 7,860 18.1 21.2 1.61 2.7

Maragondon 16,549 31.2 35.3 1.23 2.1

Mendez 1,667 22.9 28.6 2.20 17.1

Naic 8,600 72.7 88.1 1.95 10.2

Ternate 4,350 17.2 19.3 1.17 4.4

Total 142,706 2,063.1 3,090.7 4.12 21.7

Source: National Statistics Office (NSO); Cavite SEPP 2010

The three (3) cities/municipalities that have the fastest growing population are:

Trece Martires City (9.64% p.a.), Gen. Trias (8.49% p.a.), and Tanza (5.5% p.a.),

all of which are in District VI. Dasmariñas has the largest population (575,817),

followed by Bacoor (520,216), Imus (301,624) and lastly, Gen. Trias (243,322).

At 2,166 persons per sq.km, Cavite‘s population density in 2010 is almost 8 times

larger than the national average of 274, indicating the province‘s high level of

urbanization and industrialization. Districts II and I, which include Bacoor, Cavite

City, Kawit, Noveleta, and Rosario, are the most densely populated, with 9,928

people per sq. km. and 8,627 per sq.km, respectively. In terms of

cities/municipalities, Rosario (16,270 per sq.km) and Gen. M. Alvarez (14,770 per

sq.km) have the highest population density, the former being a major industrial

site and the latter a resettlement site for informal settlers from Metro Manila. The

least densely populated areas are in District VII, Magallanes (270 per sq.km) and

Maragondon (213 per sq. km).

2.3.2 Urban-Rural Population Structure

Data for the urban-rural population structure of Cavite come from two (2) sources,

namely: the 2000 Census of Population and Housing of the NSO and the 2010

Cavite Socio-Economic and Physical Profile (Box 2.1)

The adoption of the new definition and the changes in the municipal structure

have resulted in the decrease in projected percentage of the urban population in

Dasmarinas City and seven (7) municipalities in the Province (Table 2.3-2).


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Box 3.1 A New Definition of Urban-Rural-Urban Dichotomy

Box 3.1 A New Definition of Urban-Rural-Urban Dichotomy

It is estimated that 88.3% of the province‘s population were living in urban areas

in 2010, an increase of 1.5% from 86.8% in 2000. As indicated in Table 2.3-2, no

significant changes in the structure of urban-rural population was expected in

2010. The municipalities of Silang, Alfonso, Gen. Aguinaldo, Indang, Magallanes,

Maragondon, and Ternate remain predominantly rural while the rest of the cities

and municipalities are predominantly urban.

Table 2.3-2 Cavite: Percentage Share of Urban and Rural Population, by City/Municipality, 2000 & 2010

City/municipality 2000 2010

Urban Rural Urban Rural

District I 100.0 0.0 100.0 0.0

Cavite City 100.0 0.0 100.0 0.0

Kawit 100.0 0.0 100.0 0.0

Noveleta 100.0 0.0 100.0 0.0

Rosario 100.0 0.0 100.0 0.0

District II 100.0 0.0 100.0 0.0

Bacoor 100.0 0.0 100.0 0.0

District III 100.0 0.0 100.0 0.0

Imus 100.0 0.0 100.0 0.0

District IV 100.0 0.0 95.7 4.3

City of Dasmariñas 100.0 0.0 95.7 4.3

District V 66.8 33.2 66.9 33.1

Carmona 100.0 0.0 100.0 0.0

Gen. M. Alvarez 100.0 0.0 100.0 0.0

Silang 32.7 67.3 33.0 67.0

District VI 95.3 4.7 97.2 2.8

Trece Martires City 100.0 0.0 100.0 0.0

Amadeo 47.9 52.1 45.8 54.2

Delineating urban from rural areas has been approached from different points of view, using

different criteria. In 2000, the National Statistical Office defined “urban” in terms of

population density, physical characteristics, and the presence of commercial, manufacturing,

recreational, or establishments catering to personal services. These criteria formed the basis

of the definition of the urban areas since 1970. .

The more recent definition, prescribed by the National Statistical Coordination Board since

2003 uses population, the number of establishments, and the number of employees in

establishments as main criteria. In the new definition, a barangay has urbanized if :

1) It has a population size of 5,000 or more, or 2) It has at least one establishment with a minimum of 100 employees, or 3) If it has 5 or more establishments with a minimum of 10 employees, and 5 or more Facilities within a two-kilometer radius from the barangay hall.

The adoption of the new definitions and the creation of new barangays partly explain the

distortion in the historical urbanization trends on some local areas.


2-4


Urban Rural Urban Rural

Gen. Trias 100.0 0.0 100.0 0.0

Tanza 100.0 0.0 100.0 0.0

District VII 51.0 49.0 52.9 47.1

Tagaytay City 100.0 0.0 100.0 0.0

Alfonso 19.1 80.9 17.9 82.1

Gen. Aguinaldo 24.1 75.9 21.5 78.5

Indang 38.3 61.7 37.0 63.0

Magallanes 2.1 97.9 1.8 98.2

Maragondon 1.8 98.2 1.9 98.1

Mendez 82.0 18.0 81.8 18.2

Naic 81.7 18.3 82.3 17.7

Ternate 23.0 77.0 22.3 77.7

Total 86.8 13.2 88.3 11.7

Source: 2000 data - National Statistics Office (NSO); Cavite SEPP 2010

2.3.3 Age Structure and Dependency Ratio

Figure 2.3-1 shows Cavite‘s population by age group as of 2010. According to

the Cavite SEPP 2010, 62.2% of the total population is comprised of the working

age group; the rest is comprised of 34.6% children, and 3.2% elderly.

Consequently, the dependency ratio was at 60.8%,with 6 dependents for every

10 persons of economically productive age. This is lower than the national

average of 69%, where there are almost 7 dependents for every 10 persons of

working age. This means that Cavite has a more dynamic population structure,

given its higher percentage of economically active population compared with the

national average.

Source: Cavite Socio-Economic and Physical Profile 2010

Figure 2.3-1 Cavite: Population by Age Group,

2010 (Percent of Total Population)


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2.3.4 Number of Households and Household Size

There were 681,700 households in Cavite in 2010, with an estimated average

household size of 4.54. This reflected an annual increase of 5.9% in households

from 2000-2010, faster than the population growth of 4.12% p.a. in the province

during the same period. This suggests that the average family size has become

smaller (refer to Table 2.3-3).

The largest number of households can be found in Districts VI (130,700), IV

(119,700) and II (119,600). Dasmariñas City (119,700) has the largest number of

households, followed by Bacoor (119,600), Imus (65,400) and Gen. Trias

(56,800).

The two most populous districts, VI and IV, also had small average family sizes,

of 4.4 and 4.8, respectively. The district with the smallest family size was District I

at 4.30. Interestingly, rural areas which had the least number of households had

the largest household size. Specifically, these are the towns of Gen. Aguinaldo,

Ternate, Maragondon, and Magallanes (District VII) which had household sizes

close to 5.0.

Table 2.3-3 Cavite: Number of Households and Household Size, by City/Municipality, 2000 & 2010


No. (‘000) Size No. (‘000) Size

District I 57.6 4.64 72.8 4.30

Cavite City 21.3 4.64 22.7 4.46

Kawit 13.5 4.64 18.3 4.27

Noveleta 6.9 4.61 9.9 4.20

Rosario 15.8 4.64 21.9 4.21

District II 64.0 4.77 119.6 4.35

Bacoor 64.0 4.77 119.6 4.35

District III 42.2 4.62 65.4 4.61

Imus 42.2 4.62 65.4 4.61

District IV 77.3 4.90 119.7 4.81

City of Dasmariñas 77.3 4.90 119.7 4.81

District V 63.8 4.95 91.7 4.57

Carmona 10.4 4.57 18.1 4.14

Gen. M. Alvarez 22.6 4.97 28.7 4.82

Silang 30.8 4.92 44.9 4.76

District VI 60.6 4.71 130.7 4.40

Trece Martires City 8.8 4.75 23.9 4.38

Amadeo 5.5 4.69 7.4 4.52

Gen. Trias 23.3 4.60 56.8 4.28

Tanza 23.0 4.77 42.6 4.43

District VII 63.2 4.95 81.8 4.73


2-6


No. (‘000) Size No. (‘000) Size

Tagaytay City 8.6 4.91 13.5 4.59

Alfonso 8.0 4.92 10.2 4.76

Gen. Aguinaldo 2.8 5.17 3.5 4.99

Indang 10.6 4.82 13.1 4.74

Magallanes 3.4 5.28 4.4 4.77

Maragondon 6.3 5.28 7.4 4.77

Mendez 4.8 4.81 6.3 4.53

Naic 15.2 4.75 19.4 4.53

Ternate 3.5 4.85 4.0 4.88

Total 428.9 4.78 681.7 4.54

Source: 2000 data - National Statistics Office (NSO); 2010 – Estimated

2.3.5 Income Levels and Profile

Despite the fact that some areas in Cavite have been assigned as relocation sites

for Metro Manila‘s informal settlers, the province already has a low and slightly

declining poverty incidence. The poverty incidence among Cavite‘s families

improved slightly from 4.8% in 2003 to 4.5% in 2009. In contrast, the national

average was 4 times higher at 24.4% in 2003 which declined to 20.9% in 2009

(Figure 2.3-2).

Similarly, there is a marked contrast between the local and national incidences. In

Cavite, the incidence of poverty among population dropped from 6.7% in 2003 to

6.4% in 2009 while the national average was at 30.0% in 2003, and 26.5% in

2009 (Figure 2.3-3)

Source: National Statistical Coordination Board

Figure 2.3-2 Incidence of Poverty among Families: 2003-2009

(% of Families)

4.8 4.2 4.5

24.4

21.1 20.9

0

5

10

15

20

25

30

2003 2006 2009

Cavite Philippines


2-7

Source: National Statistical Coordination Board

Figure 2.3-3 Incidence of Poverty among Population: 2003-2009 (% of Population)

The average annual family income in Cavite was P282,606 in 2009. It was much higher than the average of P248,600 for CALABARZON and P206,000 for the entire country. The average family income for Cavite in 2009 represented an average annual growth of 4.10% from P196,401 in 2000.

The annual average family expenditure was P255,018 in Cavite, as compared

toP212,633 for CALABARZON and P176,000 for the entire country. This

represents an average annual growth of 5.29% from the average family

expenditure of P160,334 in 2000.This makes Cavite among the more dynamic

and affluent provinces in the Philippines and suggests the significant presence of

a relatively sophisticated market.

2.3.6 Labor Force and Employment Structure

Employment data prior to 2007 are not comparable to present data due to a

change in the definition of labor force which has resulted in lower unemployment

rate. Hence, the comparison is being made with data from 2008. There are also

no actual employment figures at the provincial level after 2003. However,

previous results indicate that a relatively industrialized area like Cavite has a

higher labor force participation rate and higher unemployment rate as more

people migrate to this area to search for employment and income opportunities.

Based on the above observations, it was estimated that Cavite generated 1.25

million jobs in 2010, 2.4% higher or 29,000 more than in 2008. Consequently, the

unemployment rate declined from 10.1% to 9.7% despite the rise in labor force

participation from 63.1% to 64.4% (Table 2.3-4). This indicates that the province

is increasingly providing jobs to new entrants in the labor force.

6.7 6.2 6.4

30.0

26.4 26.5

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

2003 2006 2009

Cavite Philippines


2-8

Table 2.3-4 Cavite: Labor Force, Employment and Unemployment

2005 2010

Population 15 years old and over (‘000) 2,062.6 2,134.7

Labor Force Participation Rate (%) 63.1 64.4

Labor Force (‘000) 1,301.5 1,374.8

Employed (‘000) 1,211.6 1,241.4

Employment Rate (%) 89.9 90.3

Unemployed (‘000) 131.5 133.4

Unemployment Rate (%) 10.1 9.7

Source: National Statistics Office (NSO); 2005 Cavite Socio-Economic Profile; 2010 data - Estimated

2.3.7 Health Indicators

Based on 2009 and 2010 records, Cavite had lower birth rate (20) and death rate (3.7) than Calabarzon and the entire Philippines. Crude Birth Rate (CBR) for Calabarzon was 23, while its Crude Death Rate (CDR) was 5.6. For the Philippines, CBR was 20; while CDR was 5.1. Cavite‘s infant mortality rate of 5.6 was slightly higher than Calabarzon‘s 5.0.

Table 2.3-5 Vital Health Statistics: 2009 and 2010

Health Indices 2009 2010

Infant mortality rate (IMR) 5.53 5.64

Maternal Mortality Rate (MMR) 41.02 61.29

Crude Death Rate (CDR) 3.59 3.74

Crude Birth Rate (CBR) 21.75 20.16


Water-borne diseases are among the province‘s leading causes of morbidity.

Gastroenteritis and colitis has a morbidity rate of 197 per 100,000 population.

This is, however, lower than the nationwide morbidity rate for the same disease

at about 500 per 100,000 population. Water-related causes are not among the

leading causes of death in Cavite.

Table 2.3-6 Ten Leading Causes of Morbidity and Mortality: 2010

Morbidity Mortality

Disease No.

(‘000) Rate per 100,000

Causes No.

(‘000) Rate per 100,000

1. Hypertension 124.1 3,766 1. Pneumonia 0.751 23

2. Acute upper respiratory infection

71.8 2,180 2. Acute myocardial infarction

0.746 23

3. UTI 11.0 333 3. Malignant neoplasm

0.584 18

4. Influenza 6.5 198 4. Hypertensive heart disease

0.515 16

5. Gastroenteritis & colitis

6.5 197 5. Heart disease, organic

0.455 14


2-9

Morbidity Mortality

Disease No.

(‘000) Rate per 100,000

Causes No.

(‘000) Rate per 100,000

6. Other respiratory disorders

5.6 169 6. Cardiovascular disease

0.407 12

7. Multiple open wounds

5.5 166 7. Acute renal failure 0.371 11

8. Acute nasopharyngitis

4.2 126 8. Respiratory tuberculosis

0.330 10

9. Bronchitis 3.9 118 9. Diabetes melitus 0.329 10

10. Disorder of the skin 3.6 110 10. Atherosclerotic heart disease

0.283 9


2.3.8 Demographic and Employment Projections

The economically active population (15 years old and above) in Cavite is

expected to rise from 2.09 million in 2010 to 4.33 million in 2040. This represents

an increase in share to total population from 65.3% in 2010 to 80.5% in 2040.

Assuming a constant 64% Labor Force Participation Rate (LFPR)—nearly the

average LFPR for Cavite during the past 5 years—the size of the labor force is

projected to go up from 1.35 million to 2.77 million (Table 2.3-7).

On the other hand, employment growth projections were developed by taking

CALABARZON‘s GRDP and labor force growth into consideration. The projected

GRDP growth in CALABARZON is 3 - 4% annually. As the unemployment rate

drops below 10%, GRDP growth will be faster than labor force growth beyond

2020 due to increases in productivity and the slowdown in population growth.

Given this trend, employment is projected to rise from 1.24 million (90.3% of labor

force) in 2010 to 4.64 million (91.7% of labor force) in 2040. This also suggests a

decline in the unemployment rate from 9.7% in 2010 to 8.3% by 2040.

Table 2.3-7 Cavite: Labor Force Projections

2015 2020 2025 2030 2035 2040

Population 15 y.o. & over (‘000) 2,804.2 3,547.9 4,391.3 5,306.4 6,272.2 7,254.2

Labor force participation rate (%) 64.0 64.0 64.0 64.0 64.0 64.0

Labor force (‘000) 1,794.7 2,270.3 2,810.4 3,396.1 4,014.2 4,642.7

Employed (‘000) 1,617.2 2,063.9 2,559.8 3,114.3 3,681.0 4,257.3

Employment rate (%) 90.1 90.9 91.1 91.7 91.7 91.7

Unemployment rate (%) 9.9 9.1 8.9 8.3 8.3 8.3


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2.4 ECONOMIC STRUCTURE

2.4.1 Gross Regional Domestic Product (GRDP) by Industrial Origin:

CALABARZON

Gross regional domestic product (GRDP) measures the overall level of output or

economic activity in a particular region in a given period of time. Based on

historical record, it appears that the entire country has grown almost twice

faster(at 4.3%) than CALABARZON (2.4%)from 2006 to 2009. The growth of

CALABARZON‘s industrial sector remained almost constant over the 2005-2009

period (Table 2.4-1).

The region‘s performance, however, may not necessarily have been dragged

down by Cavite, but more likely by the less industrialized provinces in the region.

As will be shown in subsequent sections of the study, Cavite‘s industrial sector

remained dynamic from 2005 to 2009. It should also be noted that the province

could have a higher share of the industrial sector in its economy than the 38.3%

average for the entire CALABARZON due to the presence of numerous industrial

parks and estates in the area. Cavite is only 2nd to Laguna in terms of the

provinces with the most number of industrial estates in the country.

Table 2.4-1 Gross Regional Domestic Product (GRDP): CALABARZON vs Philippines

Area

2005 2009 % Ave.

Annual

GR

in Billion

Pesos @

1985 prices

% share to

GRDP

in Billion

Pesos @

1985 prices

% share to

GRDP

CALABARZON (Region IV-A)

GRDP 150.6 100.0 165.6 100.0 2.4

Agriculture, fishery &

forestry 28.3 18.2 31.1 18.8 2.4

Industry 62.9 40.9 63.4 38.3 0.2

Services 59.4 40.9 71.0 42.9 4.6

PHILIPPINES

GDP 1,211.4 100.0 1,432.1 100.0 4.3

Agriculture, fishery &

forestry 230.8 19.1 259.4 18.1 3.0

Industry 396.9 32.8 460.2 32.1 3.8

Services 583.6 48.2 712.5 49.8 5.1

Source: National Statistical Coordination Board (NSCB)

2.4.2 Agriculture, Fishery, Poultry and Livestock

Except for rice and corn, Cavite generally cultivates high value commercial crops,

such as fruits, sugarcane, vegetables, and cut flowers. The production of

traditional cash crops, slipped during the past five years, although vegetables and


2-2

other crops managed to hold up. Other crops include papaya, dragon fruit,

muskmelon, and watermelon. There has also been a noticeable shift towards

sugarcane cultivation, perhaps due in part to increased demand for bio-ethanol

as a result of the implementation of the Bio-Fuels Act. Overall, agricultural crop

production is estimated to have posted a growth rate that is only slightly below

the CALABARZON average agricultural growth of 2.4% in 2005-2010 (Table 2.4-

2).

Table 2.4-2 Cavite: Production of Major Agricultural Crops (Metric Tons)

Major crops 2005 2010 % Ave. annual GR

Rice 59,008 63,584 1.5

Corn 8,458 4,244 -12.9

Root crops 11,460 11,204 -0.5

Pineapple 35,026 30,047 -3.0

Mango 22,674 17,951 -4.6

Coffee 9,108 8,318 -1.8

Banana 22,496 21,320 -1.1

Other fruit trees 23,138 18,204 -4.7

Sugarcane 26,895 83,070 25.3

Vegetables 18,484 23,182 4.6

Other crops 4,417 5,522 4.6

Cupflower (in dozens) 121,163 134,357 2.1

Source: Cavite Socio-Economic and Physical Profile (Cavite SEPP 2010)

Amid the slow growth in agricultural crop production, Cavite recorded an

increase in the land area devoted to agricultural crops. Based on records from

the Cavite Provincial Agriculturist office, the percentage of land area planted to

crops rose significantly to 36.3% in 2010 from 25.5% in 2005 (Table 2.4-3 and

Figure 2.4-1). Almost all districts showed increases in the size of area planted.

The most noticeable, however, was in the relatively rural District VII where the

share jumped to 43.9% from 26%. This trend indicates a shift in cultivation to

more land-intensive crops (e.g. sugarcane) that presumably have higher returns.


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Table 2.4-3 Cavite: Area Planted to Crops

City/Municipality

2005 2010

Hectares % of total land

area Hectares

% of total

land area

District I 147 6.0 323 13.2

Cavite City - - - -

Kawit 120 9.0 260 19.4

Noveleta 25 4.6 52 9.6

Rosario 2 0.3 11 1.9

District II 438 8.4 260 5.0

Bacoor 438 8.4 260 5.0

District III 1,953 29.1 2,090 31.2

Imus 1,953 29.1 2,090 31.2

District IV 1,574 19.1 2,410 29.3

City of Dasmariñas 1,574 19.1 2,410 29.3

District V 4,919 25.0 6,089 31.1

Carmona 492 15.9 424 13.7

Gen. M. Alvarez 253 27.0 72 7.7

Silang 4,174 26.7 5,592 35.7

District VI 10,100 33.5 11,601 38.5

Trece Martires City 274 7.0 627 15.9

Amadeo 4,516 94.3 4,785 99.9

Gen. Trias 3,501 29.7 3,676 31.2

Tanza 1,809 18.8 2,513 26.1

District VII 17,213 26.0 29,060 43.9

Tagaytay City 1,123 17.0 1,080 16.3

Alfonso 3,315 51.3 4,323 66.9

Gen. Aguinaldo 1,394 27.3 3,963 77.7

Indang 2,298 25.8 5,191 58.2

Magallanes 1,588 20.2 5,821 74.1

Maragondon 2,732 16.5 3,649 22.0

Mendez 899 53.9 1,148 68.9

Naic 3,305 38.4 3,279 38.1

Ternate 559 12.8 606 13.9

Total 36,346 25.5 51,833 36.3



2-4

Figure 2.4-1 Agricultural Land Use

Offsetting the generally slow growth in agricultural crop production, Cavite‘s

fishery sub-sector did well, led by aquaculture which had a compound annual

growth rate (CAGR) of 24.3% in 2005-2010 (Table 2.4-4). Aquaculture‘s

remarkable performance can be credited to significant strides in oyster and

mussel culture. Municipal fishing production had a 7.7% CAGR while commercial

fishing had a 3.8% CAGR.

Table 2.4-4 Cavite: Fishery Production (Metric Tons)

Type of fishing 2005 2010 % CAGR Major producing areas in 2010

(% of total production)

Commercial fishing 5,072 6,126 3.8 Rosario (36%), Tanza (29%), Ternate (29%)

Municipal fishing 5,699 8,249 7.7 Rosario (25%), Tanza (24%), Bacoor (13%), Naic (12%)

Aquaculture 5,233 12,546 24.3 Kawit (59%), Bacoor (36%), Noveleta (2%); mostly oyster, mussel, milkfish and tilapia


Cavite‘s livestock industry showed modest growth during the 5-year period,

although the swine/hog population actually declined. In contrast, poultry posted

creditable performance, with the chicken population rising by 38.7% yearly to


2-5

reach almost 10 million heads in 2010 from just about 2 million in 2005. Other

poultry, consisting mostly of geese and quail, increased by 21.1% p.a. (Table

2.4-5)

Table 2.4-5 Cavite: Livestock and Poultry Population (‘000 Heads)

Livestock/

poultry

2005 2010 % CAGR

(Total) Backyard Commercial Total Backyard Commercial Total

Livestock

Cattle 19.5 2.3 21.8 21.4 2.5 23.9 1.9

Swine/Hog 74.9 644.9 719.8 56.3 586.7 643.0 -2.2

Goat 11.3 2.1 13.4 14.0 3.7 17.7 5.7

Carabao 3.3 - 3.3 3.3 0.2 3.5 1.2

Others 2.6 0.2 2.8 2.8 0.4 3.2 2.7

Poultry

Chicken 137.7 1,770.5 1,908.0 150.3 9,653.5 9,803.8 38.7

Duck 17.0 9.8 26.8 22.6 8.8 31.4 3.2

Others 22.4 25.3 47.7 4.7 119.8 124.4 21.1


Significant increase in area planted to crops is not anticipated over the medium-

term as urbanization and industrialization take precedence over agricultural

development. The modest increase in agricultural crop production will essentially

come from productivity improvement and shift to higher value crops. Cultivation of

crops, however, is not a source of demand for the water supply project as it is

more dependent on irrigation and other water sources, hence even competing

with the project for water source. Poultry and livestock have stronger growth

potential due to increase in large scale operations which feed into agro-

processing, and which is a major source of demand for the water supply project.

Overall, the agricultural sector will remain to a major user of the water resources

of the province, but its growth in demand will be modest at 3-4% per annum,

slower than the demand of households, industrial establishments and tourism-

related establishments.

2.4.3 Industry, Commerce and Trade

Cavite experienced an average annual 2.4% increase in registered industrial

establishments, from 668 in 2002 to 806 in 2010 (Figure 2.4-2). These

establishments were categorized into the following: electronic, electrical and

telecommunication parts and equipment (17.4%); services (15.5%); fabricated

metal products, machinery and equipment (13.5%); chemicals, rubber and plastic

products (12%); textile, wearing apparel and leather industries (9.7%); non-

metallic mineral products (5.6%); basic metal products (5.1%); and agri-business,

livestock and poultry (5%).


2-6

Roughly one-fourth (26.3%) of the investors in the industrial establishments were

Filipinos. The other top nationalities of investors were the Japanese (18.2%) and

Koreans (13.8%)


Figure 2.4-2 Cavite: Number of Industrial Establishments

As of 2010, there were 28 operating industrial estates (IE‘s) and economic zones

(EZ‘s) with a combined land area of almost 1,500 hectares in Cavite (Table 2.4-

6). In addition, there were seven (7) proclaimed IE‘s/EZ‘s and 16 IE‘s/EZ‘s that

were in progress. The 28 operating IE‘s and EZ‘s had 629 industrial

establishments, or 78% of the industrial establishments for the entire province.

Based on 2010 data, most of the industrial establishments are found inside

industrial estates (90% of total establishments), with only 10% operating outside

the estates.

Most of the industrial zones are concentrated on the middle eastern part of the

province, especially in Gen. Trias, Silang and Carmona. A significant number of

industrial estates also operate in the northern part, specifically in Imus and Tanza

(Figure 2.4-3). In terms of number of establishments (i.e., locators in industrial

zones/estates), it is still the central area that prevails, particularly Carmona (204

establishments), Dasmarinas (118), Gen. Trias (50) and Trece Martires (36).

In addition to the operating industrial estates/economic zones, there are at least

16 more IE‘s/ecozones that are under development. Most of these are still found

in the same locations as existing IE‘s/ecozones: District I or the northern part

(Rosario, 2 with a total area of 128 hectares; Cavite City, 2 with total of 190

hectares; Kawit, 1 with 93 hectares); and in the central area (Dasmarinas, 1 with

86 has; Silay, 2 with a total of 245 has; Trece Martires, 2 with total of 140 has;

and Gen. Trias, 4 with total of slightly over 300 has). There are also 7 newly

proclaimed industrial estates, and they are all in the same location as those

under development. In short, the areas of industrialization over the medium-term,

i.e., the next 3-5 years, are still the same areas that are already industrialized.

668

718 731

751 760

773

805 798 806

600

650

700

750

800

850

2002 2003 2004 2005 2006 2007 2008 2009 2010


2-7

Figure 2.4-3 Industrial, Commercial and Recreational Facilities

The trend in industrialization will have implications on water demand from

industrial establishments based on two factors: location of industries and type of

industries. The on-going development of new industrial estates/ economic zones

suggest that the increases in water demand for industrial usage will still mostly

come from the northern (District I) and central/middle (Districts IV, V and VI)

areas.

Not all industries, however, are water-intensive, which are the ones that could

create a surge in demand rather than just natural growth in demand due to the

growth in industry. The water intensive industries would be food and beverages

(4% of establishments in 2010), agri-business (5%), and, to some extent,

electronics (17%, mostly for washing/cleaning) and chemicals (12%, for

compounding and other chemical processes). When added up, the water

intensive industries account for about 38% of the total industrial establishments.

Except for very few industrial estates under development which specified

preferred industries (electronics, etc. in Silang and one estate in Gen. Trias), it is

difficult at this point to identify the specific type of industries that will increasingly

locate in Cavite.

Nonetheless, reasonably rapid industrialization will be sustained in the province

over the medium-term, so water supply will have to support this industrial growth.

In this case, the industrial demand for water will grow by at least the same pace

as the industrial sector growth. The Calabarzon Regional Development Plan

2011-2016 targets a growth of 5-8% p.a. in terms of gross regional product.

Based on historical record, actual growth performance is just about half of target.


2-8

Hence, the likely GRDP increase is about 3-4% p.a. Further, industry growth is

roughly 1%-point faster than GRDP growth in Calabarzon. It is also assumed that

Cavite‘s industrial sector will grow faster than the industrial growth target for the

entire region as, similar to Laguna, it has the more dynamic industrial sector. This

means about 5-6% per annum increase in Cavite‘s industry, which is also

assumed to be the growth in industrial demand for water.

Table 2.4-6 Operating Industrial Estates/Economic Zones in Cavite: 2010

Name of Ecozone/ Industrial estate

Location Land area

(ha.) No. of Operating Establishments

Cavite Economic Zone Rosario 278.5 261

Cavite Economic Zone II Rosario 53.7

SM City Bacoor – Teletech Bacoor 8.8 4

Anabu Hills Industrial Estate Imus 10.8 4

EMI Special Economic Zone Imus 12.2 1

Imus Informal Industrial Estate Imus 200.0 8

Dasmariñas Technopark Dasmariñas City 38.0 11

First Cavite Industrial Estate Dasmariñas City 154.5 86

First Cityland Heavy Industrial Center Dasmariñas City 32.1 1

Granville Industrial Complex Carmona 7.0 13

Golden Mile Business Park Carmona 45.1 35

Mountainview Industrial Complex I Carmona 24.0 29

Mountainview Industrial Complex II Carmona 22.3 9

Southcoast Industrial Estate Carmona 13.4 19

Welbourne Industrial Estate Carmona 12.0 16

Cavite-Carmona Industrial Estate People’s Technology Complex

Carmona 100.0 46

GMA-NHA Industrial Estate Gen. Mariano Alvarez 10.0 3

Cavite Light Industrial Park Silang 37.4 15

Daiichi Industrial Park Silang 55.0 7

Greenway Business Park Silang 10.5 6

Maguyam Industrial Estate Silang 16.4 8

Meridian Industrial Park Silang 39.4 4

Gateway Business Park Gen. Trias 180.0 19

Golden Gate Business Park Gen. Trias 81.7 NA

Manggahan Industrial Estate Gen. Trias 10.2 4

New Cavite Industrial City Gen. Trias 52.0 18

Lu Chu Industrial Estate Tanza 8.8 2

TOTAL 1,497.5 629


Cavite generated exports worth US$7.3 billion in 2010, an increase from US$4.1

billion in 2002, although below the peak of US$11.7 billion in 2007 (Figure 2.4-

4).The Cavite economic zones accounted for 18% of the countrywide PEZA

ecozone exports in 2010.The Cavite ecozones also required US$6.7 billion worth

of imports in 2010, double their demand of US$3.1 billion in 2002. In short,

exports exceeded imports, so the province consistently enjoyed trade surpluses.


2-9

2002 2003 2004 2005 2006 2007 2008 2009 2010

Imports 3,133 4,299 3,941 2,349 8,589 8,589 8,891 5,297 6,726

Exports 4,107 5,187 8,078 9,254 10,213 11,720 11,245 6,453 7,312

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

Imports Exports


Figure 2.4-4 Value of Exports and Imports Generated by Economic Zones in

Cavite: 2002-2010 (US$ Million)

Overall, Cavite registered 13,459 business establishments in 2010, including the

806 industrial establishments. Of these, 2,812 (20.9%) are found in Dasmariñas

City; 2,261 (16.8%) in Bacoor; 2,180 (16.2%) in District IV, mostly in Gen. Trias

(824, 6.1%) and Trece Martires City (700, 5.2%); and 1,829 (13.6%) in District V

(Silang: 1,034, 7.7%). Completing the figures is District VII with 1,010 (7.5%)

(Figure 2.4-5).


Figure 2.4-5 Cavite: Number of Registered Business Establishments

District I 1,457 (11%)

District II 2,261 (17%)

District III, 1,910 (14%)

District IV 2,812 (21%)

District V, 1,829 (14%)

District VI 2,180 (16%)

District VII 1,010 (7%)


2-10

Most of the non-industrial establishments in the province are commercial

establishments, mainly tourism-related. This can be considered water-intensive,

being mostly hotels, resorts, restaurants, wellness and recreational centers like

golf clubs (the other major non-industrial establishments would be retail stores).

That is why these establishments are predominantly found in Tagaytay City, a

well-known tourism area; and, the middle part especially Dasmarinas and Gen,

Trias, and Bacoor in the north, towns with large population (Figure 2.4-6).

Services have actually grown even faster than industry in Calabarzon, and the

rapid growth trend is expected to continue as the province continues to urbanize.

Water demand growth in commercial and tourism establishments is therefore

expected to average 6-7% p.a., nearly the same pace of growth as the service

sector over the medium-term.

Figure 2.4-6 Domestic Demand Center


3-1

CHAPTER 3 WATER DEMAND ASSESSMENT

3.1 POPULATION PROJECTIONS

Disaggregated population forecasts for the period 2012-2040 is the main

determinant of water requirement in the study area. The provincial and

city/municipal population forecasts for the period consider the past population

trends, present population density, general topography, each city‘s or

municipality‘s potential for growth, and existing and proposed land use plans. The

National Statistic‘s Office‘s (NSO) 2000census-based Regional and Provincial

Population Projections for years 2000-2040 were used as the basis in developing

the provincial population projections. For the cities and municipalities, the

population forecasts were based on the projected ratio of the city and municipal

population to the provincial population.

Based on the Cohort-Component Method, the NSO projection is a composite of

three demographic factors, namely: (i) fertility, (ii) mortality, and (iii) migration.

Adjustments had to be made on the NSO provincial population projections, as the

comparison between the actual 2010 census count with the 2000 NSO census-

based medium projections for 2010, show a significant variance of more than

2.0%.

The population of Cavite province is projected to increase from 3.1 million in 2010

to 9.0 million by 2040. This is due to the continuous influx of migrants from

different parts of Metro Manila, as well as from other provinces. This is brought

about by economic opportunities from the presence of industrial estates,

availability of affordable housing, and improved connectivity with Metro Manila.

The details of the historical and projected population of the province,

disaggregated into its component cities and municipalities are shown in Annex II-

3 and Annex II-4, respectively.

Table 3.1-1 Population Projection Summary (in persons)

Year 2012 2015 2020 2025 2030 2035 2040

Cavite Province

3,406,037 3,909,526 4,820,324 5,822156 6,877,928 7,955,369 9,015,368

District I 329,830 354,733 395,785 436,989 476,431 513,209 546,331

District II 580,991 678,400 854,845 1,047,494 1,247,588 1,447,241 1,637,818

District III 329,611 372,498 444,242 514,503 578,071 631,182 670,846

District IV 630,447 715,571 862,870 1,015,214 1,164,211 1,303,477 1,426,936

District V 459,278 509,078 594,594 683,684 772,566 858,748 939,477

District VI 664,398 823,290 1,135,685 1,512,454 1,947,933 2,433,496 2,953,932

District VII 411,483 455,956 532,302 611,818 691,129 768,016 840,029


3-2

3.2 WATER DEMAND PROJECTIONS

3.2.1 Domestic (Municipal) Water Demand

The future domestic water demand was calculated based on projected unit water

consumptions of different consumer categories and the population to be served.

Other factors that were considered are the following: (i) economic potential of the

city/municipality; (ii) the present water rates; and (iii) the planned housing

projects, commercial and industrial establishments in the area based on the 2010

Socio-Economic and Physical Profile of the Province and the Comprehensive

Land Use Plans (CLUP) of each city and municipality.

In general, the total domestic water demand is equal to the sum of the residential,

commercial, institutional/government and small industries‘ demand, and non-

revenue water (NRW). The NRW is defined as the difference between water

being produced and water being billed. Unbilled connections, leakage, wastage,

and other unbilled uses constitute the NRW.

Table 3.2-1 Unit Water Consumption Standard

Category LWUA 1/ ADB 2/ WSP-NWRB 3/

Residential (lpcd)

Level I

Level II 25 - 55 30 - 40 60

Level III 90 - 280 90 -150 100 -120 (Provincial cities)

160-180 (Highly-urbanized)

Commercial (m3/conn.) 1.0 - 2.0 0.90 -1.50

Institutional (m3/conn.) 3.2 – 7.54.50 2.0 – 5.0

Source: 1/ Water Supply Feasibility Studies Methodology Manual, Local Water Utilities Administration

(LWUA) Dec. 1979 2/ Design Guidelines for LWUA-ADB Small Towns Water Supply Sector Project, Asian

Development Bank (ADB), 2002 3/ Planning and Design Considerations for Small Water Utilities, Water & Sanitation Program

(WSP) – National Water Resources Board (NWRB) Orientation and Training Workshop Handout, 2011

For this study, the following unit consumption rates, depending on the

development level of each city and municipality, were adopted:

Residential (liters/day/capita)

Level I - 30 lpcd

Level II - 60 lpcd

Level III - 90 to 145 lpcd

Commercial/industrial (m3/day/conn.) - 0.90 to 1.50

Institutional (m3/day/conn.) - 2.0 to 5.0

Small industrial establishments (m3/day/conn.) - 1,2 to 5.3 (based on actual

consumption records)


3-3

The domestic water demand forecasts were based on the urban and rural

populations projected to be served by Levels I, II, and III water supply systems

and an equivalent (domestic, commercial, institutional, and small industries) per

capita or connection consumption. The service levels were extracted from the

Cavite Socio-Economic and Ecological Profile of 2009 and validated with the

recent data gathered from the water service providers. In projecting the changes

in the service levels for years 2012 to 2040, the following were considered:

(i)existing urban-rural structure, (ii)income class per city/municipality, the current

urbanization trend, (iii)the massive ongoing improvement and expansion

programs of MWSI in its service areas (covering Cavite City and the

municipalities of Kawit, Noveleta, Rosario, Bacoor and Imus), and (iv) the

ongoing expansion programs of the Water Districts and private corporations. The

Level I service coverage is forecasted to decrease from 18.46% in 2009 to 14.0%

in 2012, and less than 1% by the year 2040 while the Level II service coverage is

projected to increase from 2.32% in 2009 to 4.4% in 2040. Likewise, Level III

coverage is forecasted to increase from 79.22% in 2009 to 95.45% in 2040.

The unit consumption for the various categories was forecasted to increase

slightly each year to reflect economic growth within the city/municipality, as

derived from forecasted rates of growth across the various sectors within the

province (NSO, 2011). An annual rate increase ranging from 0.5% to 1.0%,

consistent with LWUA methodology, was adopted.

The projected domestic/municipal water demand per city/municipality for the

years 2012 to 2040 at 5-year intervals are tabulated in Annex II-5 to Annex II-11,

and summarized in Annex II-12. The estimated current domestic water demand

of 525 MLD is estimated to be about 1,549 MLD by 2040 as shown in Figure 3.2-

1.

Figure 3.2-1 Cavite Projected Domestic Water Demand (2012-2040)

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

2012 2015 2020 2025 2030 2035 2040

Tota

l Do

mes

tic

Wat

er

Dem

and

, MLD


3-4

3.2.2 Agricultural Water Requirements

The current developments and trends such as land conversion, rapid

urbanization and industrialization have greatly affected agriculture in the province,

as reflected in Annex II-13A. In 1989, the total area allocated to agriculture was

106,080.40 hectares or about 74% of the province‗s total land area. In 2005, the

agricultural area was reduced to 70,378.90 hectares, a significant 33.7%

reduction. In 2007, it was again reduced slightly at 69,681.67 hectares but it

slightly rose to 71,474.91 hectares in 2010. In forecasting the agricultural area

allocation from year 2010 to 2040, the Draft 2012-2017 Provincial Development

and Physical Framework Plan (PDPF) was taken into consideration. The Draft

PDPF considered maintaining the agricultural land at 71,474.91 hectares, or

50.09% of the total land area of the province.

Agriculture is not limited to planted crops. Agricultural areas in Cavite are utilized

in many forms: aquaculture, livestock and poultry production, and allied

agricultural industries (feed mill production, breeding farms, demonstration farms,

etc.) As for crop production, it is one of the major components of agricultural

activities in Cavite. In 2010, 79.68% of the total agricultural areas are devoted to

crop production. Still, there were a total of seven (7) city/municipalities (Trece

Martires City and Municipalities of Amadeo, Gen. Emilio Aguinaldo, Imus,

Magallanes, Tanza and Ternate) that have areas actually planted with crops that

are larger than their declared total agricultural lands as shown in Annex II-13B.

This can be attributed to some residential, commercial and industrial lands that

are currently utilized for agricultural use.

Rice is the most planted crop in the province. In 2005, some 12,818.38 hectares,

distributed in one (city) and 11 municipalities, were planted with rice. This

dropped by 4.7% in 2007, but then increased by 9.4% and 5.5% in 2009 and

2010, respectively. In 2010, 15,347.46 hectares of irrigated land (Annex II-13C),

were cultivated -composed of Cavite Friar Lands Irrigation System (59%),

Communal Irrigation Systems (3%), and private systems (38%).

Considering that urbanization and industrialization are forecasted to take

precedence over agricultural development, the irrigable areas of those

cities/municipalities (7 towns) having larger areas actually planted with crops over

their declared agricultural lands, are assumed to decrease slightly by 0.5% to

1.0% per year for years 2012 to 2040. For the other 5 municipalities, however,

the existing irrigable areas are being maintained. Overall, the total irrigable area

is estimated to decrease by about 0.40% annually or about 12% in the year 2040

as shown in Annex II-14A and Figure 3.2-2.


3-5

Source: NIA-Naic Office, Cavite PDPFP 2008-2013, Cavite SEPP 2005, 2009 & 2010

Figure 3.2-2 Cavite Total Irrigable Area (2005-2040)

The actual percentage of benefitted service area per cropping season, based on

data gathered from NIA-Naic Office for years 2008 to 2011, showed that

benefitted area ranged from 65% to 68% in the wet season crop and 30% to 48%

in the dry season crop. For years 2012 to 2040, an average benefitted service

area of 60% is assumed all throughout. The projected benefitted service area in

hectares are shown in Annex II-14A and Figure 3.2-3.

Figure 3.2-3 Total Average Benefitted Service Area (2010-2040)

The water requirement for rice production was estimated based on the projected

irrigable areas and the average benefitted service area per cropping season. An

agricultural water duty of 1.24 lps/ha for palay, which is being adopted by NIA-

Naic Office, was used in the projections. The projected irrigated water

requirement is tabulated in Annex II-14A and shown graphically in Figure 3.2-4.

This is forecasted to decrease slightly from 934.76 MLD in 2010 to 825.41 MLD

in 2040 or by about 12% in 30 years.

7,000

7,250

7,500

7,750

8,000

8,250

8,500

8,750

9,000

2010 2012 2015 2020 2025 2030 2035 2040

Ave

rage

Ben

efit

ted

Ser

vice

A

rea,

Ha

11,000

11,500

12,000

12,500

13,000

13,500

14,000

14,500

15,000

2005 2007 2009 2010 2012 2015 2020 2025 2030 2035 2040

Tota

l irr

igab

le A

rea,

Ha


3-6

Figure 3.2-4 Total Irrigated Rice Water Demand (2010-2040)

Cavite also produces considerable amount of vegetables, among of which, fruit

bearing vegetables (tomato, eggplant, pepper, etc.) are the most cultivated in

Cavite. Historical data on areas allocated to vegetable production showed an

average annual increase of 8.3% from 2005 to 2010 (Annex II-13D). Since

modest increase in agricultural crop production is anticipated in the medium-term,

the area allocated to vegetable production of 2,148.74 hectares in 2010, is

estimated to increase by about 2.0% annually to reach 3,587.25 hectares by

2040 as shown in Annex II-14B and Figure 3.2-5.

The agricultural water requirement for vegetables was estimated based on the

projected cultivated areas and a water duty of 0.75 lps/ha as per NIA-Naic

Office. The projected irrigated water requirement is tabulated in Annex II-14B

and shown graphically in Figure 3.2-6. This is forecasted to increase by 2.0%

annually from 139.24 MLD in 2010 to 232.45 MLD in 2040.

Source: Cavite PDPFP 2008-2013, Cavite SEPP 2005, 2009 & 2010

Figure 3.2-5 Total Area Planted to Vegetables (2005-2040)

800

825

850

875

900

925

950

975

1,000

2010 2012 2015 2020 2025 2030 2035 2040

Irri

gate

d R

ice

Wat

er D

eman

d,

MLD

1,000

1,250

1,500

1,750

2,000

2,250

2,500

2,750

3,000

3,250

3,500

3,750

4,000

2005 2007 2009 2010 2012 2015 2020 2025 2030 2035 2040

Are

a P

lan

ted

to

Veg

etab

les,

H

a


3-7

Figure 3.2-6 Total Vegetables Water Demand (2010-2040)

Due to favorable weather condition, cut flower production is currently gaining

prominence in Cavite. There is a boom of flower farms and gardens and these

gardens are producing diverse varieties of ornamental plants. Historical data on

the area cultivated with these crops showed an erratic trend from 2005 to 2010

(Annex II-13D). The cultivated area increased annually by 43% in 2005 to 2007,

dropped to 6.8% in 2007 to 2009, then increased again by 21.6% in 2009 to

2010. The boom of flower farms and gardens is foreseen to continue in the future

with the 27.50 hectares planted in 2010 estimated to increase by about 1.6%

annually to reach 44.45 hectares by 2040 (Annex II-14C and Figure 3.2-7).

Source: Source: Cavite PDPFP 2008-2013, Cavite SEPP 2005, 2009 & 2010

Figure 3.2-7 Total Area Planted to Cut flowers & Ornamentals (2005-2040)

The water requirement for cut flowers and ornamental plants production was

estimated based on the projected cultivated areas and a water duty of 0.75 lps/ha

100

125

150

175

200

225

250

275

300

2010 2012 2015 2020 2025 2030 2035 2040

Veg

etab

les

Wat

er D

eman

d, M

LD

0

5

10

15

20

25

30

35

40

45

50

2005 2007 2009 2010 2012 2015 2020 2025 2030 2035 2040

Are

a P

lan

ted

to

Cu

tflo

wer

s &

O

rnam

enta

ls ,

Ha


3-8

as per NIA-Naic Office. This is forecasted to increase from 1.78 MLD in 2010 to

2.88 MLD in 2040 as shown in Annex II-14C and Figure 3.2-8.

Figure 3.2-8 Cut flowers & Ornamentals Water Demand (2010-2040)

Commercial/semi-commercial livestock and poultry farms also exist in Cavite. Livestock being raised include cattle, goat and swine/hogs. Data on livestock production showed an average annual 2.7% decline in the number of swine/hog heads from 2005 to 2010 (Annex II-13E). However, anticipating a medium growth of the livestock sector in the medium-term, the livestock production is forecasted to increase by about 1.0% annually. The number of heads is estimated to increase from 593,475 in 2010 to 833,391 by 2040 (Annex II-14D and Figure 3.2-9).

The livestock water requirement was estimated based on the projected number

of heads and an average consumption of 25 liters/head/day, as per data

gathered from the Office of the Provincial Agriculturist. The projected livestock

water demand (Annex II-14D and Figure 3.2-9) is forecasted to increase by

about 1.0% annually from 14.84 MLD in 2010 to 20.83 MLD in 2040.

Source: Cavite PDPFP 2008-2013, Cavite SEPP 2009 & 2010

Figure 3.2-9 Livestock Water Demand (2010-2040)

1.00

1.50

2.00

2.50

3.00

3.50

4.00

2010 2012 2015 2020 2025 2030 2035 2040

Cu

tflo

wer

s &

Orn

am

enta

ls

Wat

er D

eman

d, M

LD

12.0

13.0

14.0

15.0

16.0

17.0

18.0

19.0

20.0

21.0

22.0

23.0

24.0

2010 2012 2015 2020 2025 2030 2035 2040

Live

sto

ck W

ater

Dem

and

, MLD


3-9

Poultry populations in commercial farms include breeder, layer, contract broiler

and ducks. Historical data on poultry production showed an average annual

increase of 40% in the chicken and duck population from 2005 to 2010 (Annex II-

13E). However, a decreasing trend has been noted: 234% increase in 2005 to

2007, 45% in 2007 to 2009, and only 9.1% in 2009 to 2010. A total of 12

municipalities involved in the sector even posted negative growth from 2009 to

2010. For these reasons, the poultry production is forecasted to increase only by

about 1.0% annually for years 2012 to 2040. The number of heads is estimated to

increase from 9.78 million in 2010 to 12.90 million by 2040, as shown in Annex

II-14E and Figure 3.2-10.

Source: Cavite PDPFP 2008-2013, Cavite SEPP 2005, 2009 & 2010

Figure 3.2-10 Poultry Heads ‘000 Projections (2010-2040)

The poultry water requirement was estimated based on the projected number of

heads and an average consumption of 0.40 liter/head/day, as per data gathered

from the Office of the Provincial Agriculturist. Similar to livestock, poultry is

forecasted to increase by about 1.0% annually, from 3.91 MLD in 2010 to 5.16

MLD in 2040 (Annex II-14E and Figure 3.2-11).

Figure 3.2-11 Poultry Water Demand (2010-2040)

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

2005 2007 2009 2010 2012 2015 2020 2025 2030 2035 2040

Po

ult

ry H

ead

s '0

00

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

2010 2012 2015 2020 2025 2030 2035 2040

Po

ult

ry W

ater

Dem

and

, MLD


3-10

Freshwater aquaculture or inland fishery is currently being engaged by some five

(5) municipalities in Cavite with about 25.19 hectares in 2010 utilized for

freshwater culture of bangus, sugpo and tilapia. The area for aquaculture from

2007 to 2010, showed an increasing trend with an average annual increase of

13% (Annex II-13E). However, taken into account its competing uses with rice

production and the already limited surface water sources in Cavite, the current

area allocated to freshwater aquaculture is estimated to increase only by about

1% percent annually, from 25.19 hectares in 2010 to 32.16 hectares by the year

2040, as shown in Annex II-14F and Figure 3.2-12.

Source: Cavite PDPFP 2008-2013, Cavite SEPP2009 & 2010

Figure 3.2-12 Aquaculture Area (2007-2040)

The aquaculture water requirement was estimated based on the projected

cultivated area and the estimated make-up water for the aquaculture ponds,

based on an average evaporation loss of 6mm. This is forecasted to increase

from 1.51 MLD in 2010 to 1.93 MLD in 2040 (Annex II-14F and Figure 3.2-13).

Figure 3.2-13 Aquaculture Water Demand (2010-2040)

10121416182022242628303234

2007 2009 2010 2012 2015 2020 2025 2030 2035 2040

Aq

uac

ult

ure

Are

a, H

a

1.00

1.10

1.20

1.30

1.40

1.50

1.60

1.70

1.80

1.90

2.00

2010 2012 2015 2020 2025 2030 2035 2040

Aq

uac

ult

ure

Wat

er D

eman

d, M

LD


3-11

The projected agricultural water demand per city/municipality for years 2012 to

2040 at 5-year interval are tabulated in Annex II-14 and shown graphically in

Figure 3.2-14. The total agricultural water demand is estimated to slightly

decrease from 1,094 MLD in 2012 to 1,089 MLD in 2040.

Figure 3.2-14 Water Demand per City/Municipality (2010-2040)

3.2.3 Industrial Water Demand

Cavite has established a total of 51 economic zones/industrial estates, of which,

28 are operating, seven (7) are proclaimed, and 16 are still in the process of

development.

The phase of development within the Industrial Estates/Economic Zones were

assumed as follows: Operating Industrial Estates/Economic Zones are

assumed to be 75% occupied in 2010 and will be fully utilized by 2020;

Development in progress Industrial Estates/Economic Zones are assumed to

be 50% occupied in 2010 and to be 100% occupied by 2030;

Proclaimed Industrial Estates/Economic Zones are assumed to be 25%

occupied in 2010 and fully occupied by 2040;

Hence, the total area utilization was estimated to be 1,812.69 hectares and

estimated to increase to 3,078.04 hectares by the year 2040, a 170% increase of

the industrial area as shown in Annex II-15A and Figure 3.2-15.

0255075

100125150175200225250

Cav

ite

Cit

y

Kaw

it

No

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ta

Ro

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o

Bac

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r

Imu

s

Das

mar

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Cit

y

Car

mo

na

Gen

. Mar

ian

o A

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ez

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Trec

e M

arti

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Cit

y

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Gen

. Tri

as

Tan

za

Taga

ytay

Cit

y

Alf

on

so

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ilio

Agu

inal

do

Ind

ang

Mag

alla

nes

Mar

ago

ndo

n

Men

dez

Nai

c

Tern

ate

Agr

icu

ltu

ral W

ate

r D

em

and

, MLD

2010 2012 2015 2020 2025 2030 2035 2040


3-12

Figure 3.2-15 Phase Development of Industrial Estates/Economic Zones (2010-2040)

As of 2010, there were153 industries located outside the Industrial

Estates/Economic Zones. This is projected to increase by 5.0% annually, to reach

661 by the year 2040, considering that rapid industrialization is assumed to be

sustained in the province over the medium term as shown in Annex II-15B and

Figure 3.2-16.

Source: Cavite SEPP 2005, 2009 & 2010

Figure 3.2-16 Number of Industrial Establishments Outside IEs/EZs (2005-2040)

1,000

1,500

2,000

2,500

3,000

3,500

2010 2012 2015 2020 2025 2030 2035 2040

Hec

tare

s o

f In

du

stri

al E

stat

es/

Eco

no

mic

Zo

nes

100

120

140

160

180

200

220

240

260

280

300

2005 2009 2010 2012 2015 2020 2025 2030 2035 2040

No

. of

Ind

ust

rial

Est

ablis

hm

ents

Ou

tsid

e

In

du

stri

al E

stat

es/

Eco

no

mic

Zo

ne

s


3-13

The total industrial water demand was estimated based on the assumed phase of

development within the IEs/EZs, increase in the number of industrial

establishments outside the IEs/EZs, and assuming a unit consumption of 60

cum/day/ha and 25 cum/day/connection. The projected industrial demand is

forecasted to increase annually by 1.8%, from 112 MLD in 2010 to 192 MLD by

2040. The industrial demand projections are tabulated in Annex II-15 and shown

graphically in Figure 3.2-17.

Figure 3.2-17 Cavite Industrial Water Demand (2010-2040)

3.2.4 Recreation

At present, Cavite has a total of 8 internationally-known, operational golf courses. Other recreation facilities include zoos, theme farms, and leisure parks and farms. The existing and future water demand for golf courses and other recreation facilities was estimated based on total land area and water duty/requirement of 0.20 lps/ha, based on the NWRB policy on the use of water for the maintenance of turf grasses in golf courses. The recreational water demand is forecasted to increase by about 1.0% annually, from 12.02 MLD in 2010 to be 15.17% MLD by the year 2040. The projected total recreational water demand is tabulated in Annex II-16 and shown graphically in Figure 3.2-18:

100

110

120

130

140

150

160

170

180

190

200

2010 2012 2015 2020 2025 2030 2035 2040

Tota

l In

du

stri

al W

ater

Dem

and

, M

LD


3-14

Figure 3.2-18 Cavite Recreational Water Demand (2010-2040)

3.2.5 Power Generation

There are no reported existing hydropower plants in the study area. The electric

power of the entire province is being supplied by the National Power Corporation

(NPC) through the Manila Electric Company (MERALCO). The current

energization rate is at 100%.

3.2.6 Total Water Demand

The total water demands by category per city/municipality for years 2012 through

2040 at 5-year interval are shown in Annex II-17 and are summarized in Table

3.2-2. The estimated 2012 total water demand of 1,753 MLD is forecasted to

increase by 1.6% average annually, to reach 2,845 MLD by the year 2040.

Table 3.2-2 Projected Total Provincial Water Demand (mld)

Year 2012 2015 2020 2025 2030 2035 2040

Domestic Water Demand 525 538 669 838 1,063 1,297 1,549

Agricultural Demand 1,094 1,090 1,087 1,077 1,074 1,077 1,089

Industrial Water Demand 122 136 160 172 184 188 192

Recreational Water Demand 12.02 12.45 13.03 13.46 13.90 14.47 15.17

Water Demand 1,753 1,777 1,929 2,100 2,335 2,576 2,845

The percentage share of the different category of users in 2012 will have

significantly changed in the year 2040, shown in Figure 3.2-19 and Figure 3.2-

20. The agriculture demand will reduce from its 62% share in 2012 to 38% in

10.0

10.5

11.0

11.5

12.0

12.5

13.0

13.5

14.0

14.5

15.0

15.5

16.0

2012 2015 2020 2025 2030 2035 2040

Tota

l Re

crea

tio

nal

Wat

er

De

man

d, M

LD


3-15

2040. Land is a limited resource- with the built up areas forecasted to increase

further due to increase in population and industrial establishments, agriculture will

decline in land area and water demand allocation. On the other hand, the

domestic demand will dramatically increase from only 30% share in 2012 to 54%

in 2040. For industrial and recreation uses, these will experience a slight increase

but allocation will remain at the same levels at 7% and 1%, respectively.

Figure 3.2-19 Cavite Water Demand (Year 2012)

Figure 3.2-20 Cavite Water Demand (Year 2040)

The present demand for ground water, catering to domestic, agriculture

(vegetables, cut flowers and ornamentals, livestock, and poultry production),

industrial, and recreational use is estimated at 821 MLD, about 47% of the total

54%

7%

1%

38%

2040 Cavite Water Demand

Domestic Industrial Recreation Agriculture


3-16

Cavite water demand. This is forecasted to increase by an average of 3.0%

annually, to reach 2,018 MLD by the year 2040 as shown in Figure 3.2-21. By

2040, these various water uses supplied by groundwater sources, will represent

about 71% of the total water demand.

Figure 3.2-21 Total Cavite Ground Water Demand (2012-2040)

The surface water demand consists mainly of demand for irrigated rice

production and aquaculture, currently estimated at 932 MLD and representing

about 53% of the present total Cavite water demand. The demand for surface

water is forecasted to decrease by an average of 0.40% annually and estimated

to reach 827 MLD by the year 2040 (Figure 3.2-22), representing about 29% of

the total Cavite water demand in 2040.

Figure 3.2-22 Total Cavite Surface Water Demand (2012-2040)

600

700

800

900

1,000

1,100

1,200

1,300

1,400

1,500

1,600

1,700

1,800

1,900

2,000

2,100

2012 2015 2020 2025 2030 2035 2040

Tota

l Gro

un

d W

ater

Dem

and

, MLD

0

200

400

600

800

1,000

2012 2015 2020 2025 2030 2035 2040

Tota

l Su

rfac

e W

ater

Dem

and

, MLD


4-1

CHAPTER 4 WATER RESOURCES ASSESSMENT

4.1 SURFACE WATER ASSESSMENT 4.1.1 General

The main factors determining river flow, the amount of water passing any given

location along the river at any time, are:

Amount of any rainfall within this area reaching the river

Size of area drained by the river, known as it‘s watershed or catchment, and

its topography

Removal or addition of water and any control of the rate of flow

Nature of the soil, any under soil layers, and solid rock beneath

Surface water supplies are generally of two (2) types: a) on-stream storage,

which is controlled using a dam structure and is necessary for streams that

exhibit significant flow variability, and b) run-of-the river supply source which

supplies directly from the unregulated stream. In view of the potentially significant

environmental implications, this study pertains to the latter type.

Streamflow can vary considerably from the long-term average value, with the

variation being largest for short-time intervals but still has significant variation

even over longer time scales. The ability of a water source to supply a certain

level of water demand thus depends not only on the long-term mean flow, but

also on the degree of seasonal and inter-annual streamflow variability. The

seasonal variation of demand is a key determinant of supply reliability because

peaks in demand may occur when the natural availability of supply is smallest.

The ability to supply water reliably to the service area depends primarily on the

availability of the water at its source, normally measured in terms of ―Yield‖. Yield

is the amount of water that can be supplied from the river during a specified

interval of time.

4.1.2 Rainfall

Rainfall is one of the primary drivers of the hydrological cycle, with its volume

and intensity directly affecting the volume of water available within a catchment.

Rainfall within a catchment generally varies spatially with topography. Observed

rainfall is representative only of rainfall falling over a limited area in the vicinity of

the gauge. For this study, mean annual rainfall values (Table 4.1-1) are derived

from four (4) PAGASA rainfall stations located in the province of Cavite and

two(2) stations located in the province of Batangas.


4-2

Table 4.1-1 PAGASA Rainfall Stations

Rainfall Station North

Latitude East

Longitude Mean Annual Value (mm)

Data

Amadeo 14° 08’ 120° 57’ 3,414.4 1985-2003

Bacoor 14° 27’ 120° 56’ 1,744.7 1975-2006

Sangley 14° 30’ 120° 55’ 2,041.0 1974-2010

Tagaytay 14° 07’ 120° 58’ 2,115.2 1996-2010

Ambulong 14° 05’ 121° 03’ 1,782.6 1951-2010

Nasugbu 14°05’ 120° 38’ 2,053.2 1972-2010

Source: PAGASA

Isohyetal maps (Figure 4.1-1), showing lines of equal rainfall depth (isohyets),

are produced by PAGASA using the synthesized rainfall values. PAGASA

claimed that the recorded data for Amadeo station are dubious and therefore

were not included in the calculation of the annual mean rainfall isohyetal map of

the province.

Source: PAGASA

Figure 4.1-1 Mean Annual Rainfall Isohyetal of Cavite

Annual Rainfall

The average annual rainfall in the province of Cavite is heavily influenced by

monsoon and terrain. Rainfall distribution is uneven by time and space. Mean

annual rainfall in the province varies from a low of 1744.7 mm to a high of 3931.1

mm. The minimum annual rainfall is measured in Bacoor while higher annual

rainfall is generally recorded in Amadeo. The annual rainfall statistics are given

as follows;


4-3

Table 4.1-2 Annual Rainfall Statistics

Station Max Min Mean Median Std. Dev. Cv

Sangley Point 3115.8 1008.8 2041.0 2027.9 464.3 0.23

Tagaytay 2859.7 1713.0 2115.2 2066.7 355.2 0.17

Amadeo 6731.4 1668.6 3931.1 3883.0 1587.0 0.40

Bacoor 2622.9 700.3 1744.7 1738.6 406.7 0.23

Source: PAGASA

Monthly Rainfall

The conditions at the project area are reflected in the rainfall data at the four (4)

stations in the province. The maximum rainfall usually occurs during the months

of July and August. The rainy season lasts from May to October, with aggregate

rainfall in this season representing 78-90% of the total annual rainfall. The dry

season lasts from November to April, with aggregate rainfall in this season

covering 10-22% of the whole year‘s rainfall. March is the driest month while July

or August is the wettest month.

Table 4.1-3 Monthly Rainfall Statistics

Station Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Record

Sangley Point

18.8 9.8 9.6 18.8 141.1 251.8 397.8 455.9 326.9 211.0 112.6 57.7 2041.0 1974-2010

Tagaytay 39.3 38.7 32.9 51.3 193.5 233.2 381.5 279.9 337.0 204.7 161.9 141.7 2115.2 1996-2010

Amadeo 106.6 58.5 40.6 63.3 338.9 457.5 775.9 710.2 393.7 465.4 257.2 198.6 3931.1 1985-2003

Bacoor 10.5 8.4 7.0 11.2 126.0 227.1 354.0 410.3 266.9 182.9 99.8 43.7 1744.7 1975-2006

Source: PAGASA

4.1.3 Catchment Area and River System

The major river basins in Cavite (Table 4.1-4) originate in the southern

mountainous part of the province and flows northerly, traversing the various

municipalities and emptying into Manila Bay. The size of the watershed or

catchment basin is the most important parameter affecting the determination of

the total runoff.

Table 4.1-4 Major River Basins

River Basin Drainage Area (sq.km)

Maragondon 359.4

Labac 94.5

Cañas 113.1

San Juan 180.9

Imus 123.2

Source: Cavite SEPP 2010; NAMRIA


4-4

Figure 4.1-2 shows the location and catchment areas of the major basins in the province.

Source: Water Resources Assessment and Development Plan for Sustainable Utilization of Water Resources in Nine (9) LGUs in Cavite Province, SWECO-WATCON, Inc. Sept.2004

Figure 4.1-2 Major River Basins in Cavite

By definition, a watershed is the land area that contributes surface water runoff to

a common point. It is separated from adjacent watersheds by a land ridge or

divide and can vary in size, from a few hectares to thousands of square

kilometers. A larger watershed can contain many smaller sub-watersheds which

are defined in the same manner as a watershed. On a larger scale, a basin is

defined as a collection of watersheds that feed into a common main tributary or

large body of water.

The drainage areas or the points of interest in the study were determined from

the 1:50,000 topographic maps of the National Mapping and Resource

Information Authority (NAMRIA) of the Department of Environment and Natural

Resources (DENR). The locations of the gauging stations were identified in the

1:50,000 scale topographic map and delineated for confirmatory purposes. The

delineated watershed, reckoned at the site of interest, and the estimated size of

the catchment area is shown in Table 4.1-5.

Labac San Juan


4-5

Table 4.1-5 Gauged Rivers in Cavite

Gauged Rivers Location North Latitude East

Longitude Drainage Area

(sq. km)

Maragondon Maragondon 14° 16’ 20.3” 120° 45’ 37.8” 242

Panaysayan Gen. Trias 14° 20’ 7.3” 120° 52’ 53.0” 30

Balsahan Naic 14° 16’ 36.7” 120° 48’ 26.3” 22

Ilang-Ilang Imus 14° 24’ 39.9” 120° 53’ 27.2” 60

Source: BRS- DPWH

The flow of a river varies in response to available precipitation, topographic

features, soil conditions, land cover, hydro-geologic characteristics, and channel

geometry. Changes in land use, drainage patterns, stream geometry, and

ground-water levels also produce variations in stream flow. The difference

between precipitation and runoff, which varies considerably during the year, can

be attributed primarily to the seasonal differences in evapo-transpiration rates,

soil and ground-water conditions.

4.1.4 Irrigation Systems

Water for irrigated rice lands in the province is provided through the different

irrigation systems, namely: (i) Cavite Friar Lands Irrigation System (CFLIS) being

managed by NIA, (ii) Cavite Provincial Irrigation Office(CPIO)/Communal

Irrigation Systems (CIS), and (iii) private systems. While the designed service

area of the CFLIS is 15,000 hectares, its firmed-up service area as of 2010 is

8,618.09 hectares, covering 34 barangays within the eight (8) towns of Cavite

(Bacoor, Dasmariñas, Imus, Gen. Trias, Tanza, Naic, Maragondon and

Ternate).The system is a run-off the river type with approved water rights of

1,925 mld (22,278 lps) and water duty of 1.24 lps per hectare. The major dams

divert water from 18 rivers, and one (1) creek. The main irrigation facilities in the

system consist of 18 diversion dams, 72 minor dams, two reservoirs, and

conveyance canals including appurtenant structures,

The CPIO/CIS covers four (4) municipalities (Gen. Mariano Alvarez, Carmona,

Ternate and Maragondon) with a firmed-up service area of 430.63 hectares as of

2010 while the private systems are distributed within the 10 towns with a total

service area of 5,492.86 hectares. The total irrigated area as of 2010 is

14,541.59 hectares as shown in Annex II-13C. Both the CIS and private

systems divert water from the nearby rivers and creeks.


4-6

Figure 4.1-3 Existing Irrigation Systems

4.1.5 Stream flow Analysis

Maragondon River

Based on available 23-year daily streamflow data (1983-2005) of Maragondon

River in Brgy. Bucal, Maragondon from the Bureau of Research and Standards of

DPWH, the daily discharge of Maragondon River is analyzed. The mean

discharge values are expectedly high during the southwest monsoon season

(May-October) and less during the northeast monsoon season (November-April).

The daily maximum for the recorded flows varies from a high of 34,266.24 MLD

(396.60 cms) during the month of September to a low of 240.192 MLD (2.78 cms)

during the month of April. The minimum flow varies from 13.824 MLD (0.16 cms)

in September to 56.16 MLD (0.65 cms) in December (Figure 4.1-4). It was also

noted that the mean of the daily flow varies from 94.176 MLD (1.09 cms) during

the dry season to 1,900.80 MLD (22.00 cms) during the rainy season. The

coefficient of variability ranges from a minimum of 0.41 to a high of 4.07,

indicating a high variability of flow.


4-7

Figure 4.1-4 Plot of Minimum, Median and Mean Discharge of Maragondon River

The mean daily discharge of Maragondon River decreases gradually from

December to April. This closely follows the monthly rainfall pattern in Tagaytay

and Amadeo. It was noticed that the flows in late May are comparatively higher

than those in April. This may be mainly due to pre-monsoon showers. However,

in some years when the pre-monsoon showers are not received in sufficient

quantity, the later weeks of May are also affected by low flows. The monthly high

flows begin to peak in August and gradually decrease in the succeeding months.

Panaysayan River

Available daily streamflow data (1983-2004) for Panaysayan River from the

Bureau of Research and Standards of DPWH were analyzed. The river is gauged

at Brgy. Palubluban in the municipality of Gen. Trias. Mean discharge values are

expectedly high during the southwest monsoon season (May-October) and low

during the northeast monsoon season (November-April).

The maximum daily flows from record varies from a high of 11371.104

MLD(131.61 cms) during the month of July to a low of 100.224 MLD (1.16 cms)

from January to April. The minimum flow varies from 1.728 MLD (0.02 cms) in

March to 7.776 MLD (0.09 cms) from August to September (Figure 4.1-5).It was

also noted that the mean of the daily flow varies from 19.008 MLD (0.22 cms)

during the dry season to 178.848 MLD (2.07 cms) during the rainy season. The

coefficient of variability ranges from a minimum of 0.78 to a high of 4.88,

indicating a high variability of flow.

0.00

5.00

10.00

15.00

20.00

25.00

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Dis

char

ge, c

ms

Month

Minimum

Mean

Median


4-8

0.00

0.50

1.00

1.50

2.00

2.50


Dis

ch

arg

e, cm

s

Month

Min, cms

Mean, cms

Median, cms

Figure 4.1-5 Plot of Minimum, Median and Mean Discharge of Panaysayan River

The mean daily discharge of Panaysayan River decreases gradually from

December to April. The monthly high flows begin to peak in August and gradually

decrease in succeeding months. The exception is October, when the flows spike

before tapering in December.

Ilang-Ilang and Balsahan Rivers

Monthly discharge records were the only available data for the Ilang-Ilang and

Balsahan Rivers, covering the early 50‘s until the 70‘s. Source information on

daily flows were no longer available. The statistical information provided for both

gauged rivers are summarized in Table 4.1-6.

Table 4.1-6 Monthly Discharge of Ilang-Ilang and Balsahan Rivers, cms

Parameter Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec

Balsahan River

Mean 0.52 0.35 0.33 0.30 0.96 2.37 3.64 3.57 4.01 2.14 1.67 0.84

Std. Dev 0.66 0.48 0.53 0.57 1.25 2.25 4.43 3.06 3.45 2.60 3.30 1.27

Correl 0.82 0.95 0.98 0.61 0.27 0.51 0.36 0.37 0.12 0.58 0.45 0.53

Skew 1.69 2.00 2.19 2.77 1.25 1.32 2.13 1.24 0.62 1.64 3.32 1.87

Cv 1.28 1.39 1.58 1.89 1.31 0.95 1.22 0.86 0.86 1.21 1.98 1.52

Minimum 0.07 0.06 0.02 0.00 0.02 0.08 0.21 0.27 0.19 0.04 0.06 0.04

Maximum 2.38 1.62 1.92 2.3 3.57 8.74 17.89 11.43 11.26 9.32 14.79 4.27

Ilang-Ilang River

Mean 0.12 0.08 0.06 0.05 0.53 0.86 1.74 3.54 4.38 1.68 2.27 0.88

Std. Dev 0.11 0.06 0.05 0.04 2.07 2.08 4.20 4.90 7.46 2.76 4.73 1.87


4-9

Parameter Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec

Correl 0.73 0.93 0.81 -0.16 0.15 0.92 -0.03 0.81 0.01 -0.11 0.71 -0.03

Skew 1.93 1.30 1.14 1.12 4.76 3.98 3.53 2.10 1.96 2.15 2.81 3.10

Cv 0.88 0.75 0.84 0.80 3.93 2.41 2.42 1.39 1.70 1.65 2.08 2.12

Minimum 0.01 0.01 0.01 0.01 0.01 0.01 0.04 0.12 0.14 0.16 0.02 0.01

Maximum 0.5 0.26 0.2 0.16 10.46 9.8 19.04 18.71 26.21 11.59 20.52 7.99

Source: BRS-DPWH

4.1.6 Flow Duration Curve (FDC)

General

For a realistic estimation of the yield of a river, long-term monitoring is required.

The firm yield of a river is defined as the flow discharge which can be expected to

be exceeded most of the time at a certain point along a river. For example, the

minimum flow discharge value can describe a firm yield since this discharge can

be expected to be exceeded (100%) at any day and all year round. The most

informative way of showing this is to derive a flow duration curve for the river. A

flow duration curve is a simple graphical depiction of a range of flow rates

expected and the chance that these values can be equalled or exceeded as a

percentage of the period (or probability)of record at a GAUGING station.

Typically, minimum (or low) flows are exceeded most of the time, while maximum

(or high) flows are exceeded very infrequently.

The flow duration curve can be used to set categories of flow and used as a

general indicator of hydrologic conditions. The various categories and their

corresponding flow intervals drawn from an FDC are summarized in Table 4.1-7.

Table 4.1-7 Flow Duration Categories

Category Prob. of Exceedance, %

High Flows 0-10

Wet Conditions 10-40

Mid-range flows 40-60

Dry Conditions 60-90

Low Flows 90-100

In defining design flows, the sustenance of natural ecological activities in the

stream as well as the riparian flow requirement based on NWRB guidelines,

which is set equal to 10% of the flow at 80% of the time the flow is equaled or

exceeded, should be considered.

Maragondon River

The daily streamflow record at Maragondon River varies significantly over the

year. Flow duration analysis on a monthly basis was conducted on the daily


4-10

historical data and the results are shown in Table 4.1-8. The daily discharge

values are generally higher during the rainy season (May-October).

Table 4.1-8 Monthly Flow Duration of Maragondon River (cms)

Probability of Exceedance

Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec

99 0.53 0.48 0.47 0.50 0.59 0.65 0.74 1.19 1.13 1.27 1.13 0.68

95 0.59 0.50 0.49 0.59 0.62 0.74 0.86 1.35 1.44 1.78 1.24 0.68

90 0.62 0.59 0.58 0.65 0.74 0.86 1.08 1.86 2.55 2.12 1.52 0.80

80 0.86 0.83 0.71 0.74 0.77 1.08 1.52 2.78 3.35 2.55 1.78 1.35

50 1.69 1.24 1.02 0.91 1.13 1.95 4.08 5.34 0.06 4.51 2.78 2.12

For Maragondon River, about ninety five percent (95 %) of the time, one may

expect flow rates to range from 0.49 cums to1.78 cums. A firm yield on a monthly

basis can be set at the lowest value of this range 0.49 cums (dry season, March).

A ninety nine percent (99%) exceedence for Maragondon River would set a firm

yield at about 0.47 cums (dry season, March).

When all daily flows are included in a curve and regardless of the time sequence

of the year, a flow duration analysis for Maragondon River yields the results in

Table 4.1-9.

Table 4.1-9 Daily Flow Duration Curve

Prob. of Exceedance

Maragondon River, cms

All Data Dry

Season Wet

Season

99 0.49 0.48 0.62

95 0.65 0.59 0.77

90 0.77 0.68 0.97

85 0.91 0.77 1.13

80 1.02 0.86 1.30

75 1.13 0.91 1.52

70 1.24 1.02 1.95

65 1.44 1.13 2.20

60 1.61 1.24 2.55

55 1.78 1.30 3.01

50 2.03 1.44 3.35

45 2.32 1.61 3.93

40 2.55 1.69 4.37

35 3.01 1.86 4.98

30 3.35 2.03 5.88

25 4.08 2.20 6.82

20 4.80 2.55 8.54

15 6.42 2.89 12.09

10 9.50 3.35 21.25

The graph of the flow duration for Maragondon Rive is shown in Figures 4.1-6.


4-11

Figure 4.1-6 Flow Duration Curve for Maragondon River

Considering sustenance of natural ecological activities in the stream as well as

the riparian flow requirement based on NWRB guidelines which is set equal to

10% of the flow at 80% of the time the flow is equaled or exceeded, the derived

flow duration values for Maragondon River is shown in Table 4.1-10.

Table 4.1-10 Flow Duration of Maragondon River (net of riparian flow requirements)

% of time equaled or exceeded

Maragondon River (cms)

Maragondon River (MLD)

99 0.388 33.523

95 0.548 47.347

90 0.668 57.715

85 0.808 69.811

80 0.918 79.315

50 1.928 166.579

Panaysayan River

Using daily stream flow record, a flow duration analysis on a monthly basis was

conducted on the daily historical data of Panaysayan River and the results are

shown in Table 4.1-11. For Panaysayan River, in about ninety five percent (95

%) of the time, one may expect flows to range from 0.06 cums to

0.19cumsacross the months. A firm yield on a monthly basis can be set at 0.06

cms. A ninety nine percent (99%) exceedence for Panaysayan River would set

the firm yield at about 0.03 cums (observed in May).

0.10

1.00

10.00

100.00

1000.00

0 20 40 60 80 100

Dis

ch

arg

e,

cm

s

Probability of Exceedance, %

All days

Dry Season

Wet Season


4-12

Table 4.1-11 Monthly Flow Duration of Panaysayan River (cms)

Probability of Exceedance


99 0.09 0.06 0.05 0.06 0.03 0.04 0.07 0.10 0.11 0.09 0.09 0.03

95 0.10 0.08 0.06 0.07 0.07 0.08 0.11 0.16 0.19 0.14 0.12 0.11

90 0.10 0.09 0.08 0.08 0.08 0.10 0.16 0.23 0.23 0.19 0.15 0.13

80 0.13 0.11 0.10 0.10 0.10 0.16 0.21 0.37 0.31 0.25 0.21 0.15

50 0.21 0.17 0.17 0.17 0.25 0.35 0.55 0.62 0.48 0.39 0.35 0.25

A flow duration analysis of all data for Panaysayan River wasconducted and the

resulting values are summarized in Table 4.1-12.

Table 4.1-12 Daily Flow Duration Curve

Prob. of Exceedance

Panaysayan River, cms

All Data Dry

Season Wet

Season

99 0.05 0.05 0.06

95 0.08 0.08 0.09

90 0.10 0.10 0.14

85 0.13 0.11 0.17

80 0.15 0.13 0.21

75 0.16 0.14 0.25

70 0.19 0.15 0.29

65 0.21 0.16 0.33

60 0.23 0.17 0.35

55 0.27 0.20 0.37

50 0.29 0.21 0.41

45 0.33 0.23 0.48

40 0.37 0.25 0.55

35 0.41 0.29 0.62

30 0.48 0.31 0.69

25 0.59 0.34 0.76

20 0.69 0.39 1.04

15 0.91 0.45 1.32

10 1.16 0.69 2.63

The graphs of the flow duration for Panaysayan River is shown in Figures 4.1-7.

The chart is organized to show values for the dry and wet season, and when all

flows are considered.


4-13

Figure 4.1-7 Flow Duration Curve for Panaysayan River

Considering the requirement based on NWRB guidelines, the derived flow

duration values are as shown in Table 4.1-13.

Table 4.1-13 Flow Duration of Panaysayan River (net of riparian flow requirements)

% of time equaled or exceeded

Panaysayan River (cms)

Panaysayan River (MLD)

99 0.035 3.024

95 0.065 5.616

90 0.085 7.344

85 0.115 9.936

80 0.135 11.664

50 0.275 23.760

Balsahan River

Using monthly gauged stream flow data available for Balsahan River, a statistical

analysis was conducted and the results are summarized in Table 4.1-14.

0.01

0.10

1.00

10.00

100.00

1000.00

0 20 40 60 80 100

Dis

char

ge, c

ms


All days

Dry Season

Wet Season


4-14

Table 4.1-14 Monthly Streamflow Statistical Analysis of Balsahan (cms)


Balsahan River

Mean 0.518 0.345 0.333 0.301 0.956 2.370 3.644 3.575 4.007 2.144 1.655 0.836

Std. Dev. 0.663 0.479 0.527 0.570 1.254 2.255 4.430 3.064 3.448 2.603 3.303 1.270

Correl 0.815 0.948 0.980 0.606 0.274 0.505 0.360 0.374 0.117 0.578 0.447 0.533

Skew 1.693 2.005 2.190 2.766 1.250 1.321 2.131 1.241 0.624 1.640 3.323 1.874

Cv 1.281 1.389 1.583 1.894 1.312 0.951 1.216 0.857 0.861 1.214 1.984 1.518

Minimum 0.070 0.060 0.020 0.000 0.020 0.080 0.210 0.270 0.190 0.040 0.060 0.040

Maximum 2.380 1.620 1.920 2.300 3.570 8.740 17.890 11.430 11.260 9.320 14.790 4.270

Source: BRS-DPWH

The statistical parameters of the generated streamflow sequences were

compared with those of historical data. The resulting flow duration values are

shown in Figure 4.1-8.

Figure 4.1-8 Flow Duration Curve for BalsahanRiver

Ilang-ilang River

Using monthly gauged stream flow data available for Ilang-ilang River, similar

statistical analysis was conducted and the results are summarized in Table 4.1-

15.

0.001

0.010

0.100

1.000

10.000

0 10 20 30 40 50 60 70 80 90 100

Dis

ch

arg

e,

cm

s


All Data

Dry Season

Wet Season


4-15

Table 4.1-15 Monthly Streamflow Statistical Analysis of Ilang-Ilang Rivers


Mean 0.122 0.076 0.062 0.052 0.528 0.863 1.737 3.537 4.385 1.676 2.269 0.880

Std. Dev. 0.107 0.058 0.052 0.041 2.074 2.079 4.195 4.901 7.459 2.761 4.729 1.866

Correl 0.726 0.928 0.805 -0.160 0.147 0.923 -0.028 0.806 0.006 -0.106 0.710 -0.035

Skew 1.931 1.296 1.140 1.117 4.759 3.980 3.533 2.104 1.959 2.151 2.811 3.103

Cv 0.875 0.754 0.841 0.798 3.925 2.409 2.415 1.386 1.701 1.648 2.084 2.122

Minimum 0.010 0.010 0.010 0.010 0.010 0.010 0.040 0.120 0.140 0.160 0.020 0.010

Maximum 0.500 0.260 0.200 0.160 10.460 9.800 19.040 18.710 26.210 11.590 20.520 7.990

Source: BRS-DPWH

The resulting flow duration values for Ilang-ilang River are charted in Figure 4.1-

9.

Figure 4.1-9 Flow Duration Curve for Ilang-Ilang River

Minor Rivers in Cavite

Transposition method is a common practice in hydrology for estimating river

discharge of the un-gauged river. This is resorted to if the observation period is

short, as spot data can only provide insights on flow pattern prevailing at the time

of observation. The transposition of design discharges from one basin to another

basin with similar hydrologic characteristics is accomplished by relating the

design discharge with the direct ratio of the respective drainage areas. This

synthetic method was used in areas of Canas, Labas and San Juan where flow

gauging stations are unavailable.

0.001

0.010

0.100

1.000

10.000

0 10 20 30 40 50 60 70 80 90 100

Dis

ch

arg

e,

cm

s

Prob. of Exceedance, %

All Data

Dry Season

Wet Season


4-16

Aside from the four (4) rivers identified as possible surface water sources, other

rivers were also observed in the study. The following are the observations made

during the survey of six (6) minor rivers in the Province of Cavite.

1) LULUNGISAN RIVER

Lulungisan River, a tributary of Maragondon River, originates from Brgy.

Kayquit III, Indang, approximately 1.5km from the town proper. The river is

surrounded by vegetation and rock formation. Access is difficult due to steep

slopes on both sides. According to local residents, the depth of the water

usually ranges from 0.5m to1.0m. No active signs of freshwater life were

observed during the site visit. The water looked clear and was flowing quite

fast.

2) LUMIPA RIVER

Lumipa River, also a tributary of Maragondon River, originates in Brgy.

Tabora of Gen. Emilio Aguinaldo, Cavite. The river is surrounded by

vegetation and rock formation. Slope is not that steep on both sides and

some locals have settled along the banks of the river.

According to residents in the area, the depth of the river varies from 1.0m to

1.5m or deeper. No active signs of freshwater life were observed during the

site visit. The water looked clear and was quite fast-flowing.

3) HALANG RIVER

Halang river, a tributary of Panaysayan River originates from the highlands of

Tagaytay and passes through the boundary of Silang and Amadeo.

The river is surrounded by vegetation and can be easily accessed through a

constructed pathway. Information from locals indicates that the water is

usually about 0.5m deep. No active signs of freshwater life were evident

during the time of the survey. Locals use the water for washing their clothes

and garbage was observed flowing over the river. Water was a bit turbid and

flowed moderately fast.

4) HABULING RIVER

Habuling River is also a tributary of Maragondon River.It originates

approximately 2km northwest of Indang town proper. The river is surrounded

by vegetation and access is difficult due to steep slopes. The water is

relatively clear despite the presence of garbage. River flow is slow and depth

was about 0.5m at the time of the survey.

5) CAISOBO RIVER

Caisobo River originates approximately 4km southeast of Naic and is a

tributary of Balsahan River.The river is surrounded by vegetation. Water is

turbid and flows very slowly and at times almost stagnant. According to

residents, the river never dries up during summer and the water depth was

less than 0.5m at the time of the survey. Presence of garbage on the river

was observed.


4-17

6) MAGAY RIVER

Magay River is a tributary of Maragondon River and originates at gen. Emilio

Aguinaldo. It is located approximately 4km southeast of Maragondon, Cavite.

The river is surrounded by vegetation and water is a bit turbid and fast

flowing. According to residents, the river never runs dry during summer and

its depth varies from 0.5m to 1.5m or deeper. No active signs of freshwater

life were observed during the site visit.

Table 4.1-16 shows the estimated cumulative discharges of the surveyed river basins in the province.

Table 4.1-16 Cavite River Survey Stations

RIVER BASIN DRAINAGE

AREA, km²

DISCHARGE (95% PROBABILITY OF EXCEEDENCE)

DRY WET

lps MLD lps MLD

Maragondon 242.0 590.0 51.0 779.7 67.4

Labac 22.0 40.0 3.5 98.0 8.5

Cañas 30.0 80.0 6.9 90.0 40.0

San Juan 60.0 10.0 0.9 30.0 2.6

Source: Cavite Water Supply and Development Study, JICA, 1995

4.1.7 Lakes

Two (2) huge bodies of water which are potential sources of surface water supply

for the province of Cavite are Laguna de Bay and Taal Lake. These sources are

situated east and southeast of the province of Cavite.

4.1.7.1 Laguna de Bay

Laguna de Bay is a trilobate lake with

three (3) corporate bays: The West Bay,

Central Bay, and East Bay that converge

towards the South carving out what

resembles a large bird or dinosaur. The

West and Central Bays are separated by

Talim Island, the largest and most

populated of the nine islands within the

lake. It is bordered by the ruggedly high

Sierra Madre mountain ranges on the

Northeastern portion, the high Caliraya

volcanic plateau in the East and the

chains of mountains of Laguna and

Batangas province to the South and

Southeast, which includes Mt. Banahaw

and Mt. Makiling. Source: NAMRIA

Figure 4.1-10 Laguna de Bay


4-18

Laguna de Bay is the second largest body of freshwater in Southeast Asia. It has

a surface area of approximately 90,000 hectares, an average depth of 2.8m, a

total volume of 3.2 billion cubic meters measured at elevation 11.50 meters

above the Laguna de Bay datum set at 10.0 meters below the Mean Lower Low

Water (MLLW) and a shoreline of 220 kms. There are 21 tributaries that drain into

the lake; 35% of freshwater that drains comes from Pagsanjan River while 15%

comes from the Sta. Cruz River. The only outlet of the lake is the Napindan

Channel which at its confluence with the Marikina River forms the Pasig River.

This river meanders along 24-km long course westward through a major part of

Metropolitan Manila, before finally discharging into Manila Bay.

Laguna de Bay Region boundaries include six (6) provinces, 60 municipalities of

which 28 towns are lakeshore and 32 non-lakeshore towns. The lake is the single

most important resource of the Region. At present it is a source of industrial

cooling water, irrigation water, and hydroelectric power; a transport route for oil

products and the lakeshore dwellers; a source of snails for duck feed; a venue for

recreation and most notably a source of fish supply. Also, the lake serves as a

huge sink for waste coming from domestic sources (household and service

sectors); non-point sources (surface run-off from urban areas, crop lands and

forest lands); industries, livestock and poultry production, fishery activities and

Pasig River and Manggahan Floodway inflow. The latter is most alarming since

its pollution and sediment load will jeopardize the existing and potential uses of

the water body.

The hydrology of the lake has a natural stage regime which in the dry season

results in a minimum lake elevation of about 10.5 m controlled by mean level in

Manila Bay. At the end of the dry season, the lake level may drop below the level

of high tide in Manila Bay, resulting in the intrusion of seawater up the Pasig river.

With this diurnal reversal, the highly polluted waters of the Pasig river system are

carried into the lake. The tidal influx is also the primary cause of elevated salinity

in the lake during this part of the year (Francisco, 1985).

During the wet season, precipitation results in an annual mean high water

elevation of 12.5m and a peak elevation which may reach as high as 14.6m for a

100 year recurrence interval. During extremely wet years, widespread flood

damage occurs along the lakeshores because the land is relatively flat for several

kilometers inland in most areas. Also during this period, the Marikina river floods

the Pasig river and overflows into the Laguna de Bay via the Napindan Channel

because the Marikina river can generate flood flows of about 200 cms to 4000

cms, and because the Pasig river bank full channel capacity varies from as little

as 50 cms to only about 750 cms.


4-19

Source: NAMRIA

Figure 4.1-11 Taal Lake

4.1.7.2 Taal Lake

Taal Lake is a freshwater lake located in

the province of Batangas and right at the

border of Cavite Province. Lake Taal lies

less than 18 km southwest of Laguna de

Bay and around 9 km northeast of

Balayan Bay off the coast of Batangas.

The fresh water lake is located within a

complex volcanic caldera, one of the

great volcano-tectonic depressions of

the world. Its altitude is only 2.5m and its

surface measures 234.2 sq.km. It is the

deepest lake in the Philippines with a

depth of 172m.About 37 tributaries drain

into the lake and its only outlet is Pansipit

River which leaves the lake in its southwest corner and travels about 10 km and

drains into Balayan Bay. Taal Lake is the third largest lake in the Philippines after

Laguna de Bay and Lake Lanao.

There is a small volcanic island in the middle of the lake which has been the site

of almost all the historic volcanic activity and responsible for the lake's sulfuric

content. The Taal Volcano itself has a lake of its own inside its crater called

"Crater Lake". Taal Lake is situated in a highly populated and rapidly growing

agricultural and industrial region. A high ridge, part of the crater wall, rises to

640m above sea level to the northwest of the lake, upon which is located the

chief town in the catchment area, Tagaytay City. To the south and east, the land

is more gently sloping.

The catchment area is largely deforested and given over to agriculture. Coconut

cultivation is important, with additional crops such as coffee, cocoa and cassava

grown underneath the coconut trees. Other areas are dominated by grassland

and there is some livestock raising.

The physical dimensions of the lake are given as follows;

Surface Area 234.2 km²

Surface Elevation 5.0 m

Maximum depth 172 m

Mean depth 100 m

Water Level Fluctuation 2.0 m

Length of Shoreline 82.5 km

Catchment Area 380 km²

http://en.wikipedia.org/wiki/Freshwater

http://en.wikipedia.org/wiki/Provinces_of_the_Philippines

http://en.wikipedia.org/wiki/Batangas

http://en.wikipedia.org/wiki/Laguna_de_Bay

http://en.wikipedia.org/wiki/Lake_Lanao


4-20

4.1.8 Summary and Conclusions : Surface Water Assessment

River Flow

Flow duration curves for the gauged and selected ungauged rivers in Cavite were

analysed. A comparison of the flow duration values across the selected rivers,

considering riparian flow requirement based on NWRB guidelines, shows that

Maragondon has the highest significant sustainable flow. Based on available flow

data, the flows in Maragondon River during the critical months at selected

dependability levels are as follows:

Table 4.1-17 Flow Duration of Maragondon River at Critical Months, cms


Jan Feb Mar Apr May

99 0.53 0.48 0.47 0.50 0.59

95 0.59 0.50 0.49 0.59 0.62

90 0.62 0.59 0.58 0.65 0.74

80 0.86 0.83 0.71 0.74 0.77

50 1.69 1.24 1.02 0.91 1.13

From the estimated flow duration curve, Maragondon River has the best potential

as possible source of water supply in the province. Besides having a much

greater drainage area as compared to others, its source in the headwaters of

Magallanes and partly from Alfonso are generally forested and uninhabited.

Water Quality

In terms of quality, Maragondon River recieves contaminant effluents from large

tracts of agricultural production areas. It suffers from quality issues characterized

by its exceeding the limits for : (i) BOD5 and Total suspended solids (132-153.5

mg/l); (ii) allowable Total Coliform; and (iii) Fecal coliform, Phosphate, Dieldrin,

Heptachlor and Toxaphene.

While Maragondon River, has the largest sustainable yield, using it as a main

souce of water supply will present some challenges in terms of water treatment.

4.2 GROUNDWATER ASSESSMENT

4.2.1 Groundwater Resources Inventory

Groundwater assessment was informed by : (i)well inventory covering information

on well depth, elevation, diameter of casings and screens, test pumping, and

water quality test results; (ii)geologic maps that give information on the geologic

units present in the province; (iii)driller‘s logs from existing wells containing useful

information on well depth, yield, and water quality; and (iv) previous studies for

municipal, barangays, residential subdivision, industrial and commercial water

supply development projects.


4-21

The above documents served as sources of background information on

hydrogeological conditions and the assessment of groundwater potential. Aside

from these documents, raw data from well drilling contractors, private well

owners, as well as from the Philippine Groundwater Data Bank (PGDB) of the

Local Water Utilities Administration (LWUA) and the National Water Information

Network (NWIN) of the National Water Resources Board (NWRB) were collected.

Well Inventory

Records of wells were obtained from the LWUA Groundwater Data Bank,

National Water Resources Board, WATCON, Inc., local water districts, and well

drilling contractors. Available information on well owner, location, depth, casing

diameter, capacity, strata logs, test pumping results, and water quality are

presented in the Annexes to the Report.

Collected data from the NWRB that include records of 308 wells are presented in

Annex II-23. Well information includes location, depth, diameter of casings and

screens, and static and pumping water levels. Also obtained from the NWRB are

recent water quality test results of 308 wells and water level measurements of

155 wells.

A summary of well data collected from the LWUA Groundwater Data Bank is

presented in Annex II-24. There are 1,174 records of wells in the province.

However, except for the location of the well, most of the records, particularly

those on strata logs, test pumping results, and water quality test results, are

incomplete.

The Dasmariñas Water District operates and maintains the most number of wells

with complete records. As of August 2009, the water district has 100 operational

wells. Production from these wells ranges from 0.356 – 3.040 MLD (4.12 – 35.18

lps) for a total production of about 77.343 MLD.A summary of information

obtained from the Water Safety Plan of the Dasmariñas Water District is

presented in Annex II-25.

Data obtained from the SWECO4 report shows that a total of 642 wells were

inventoried during the study. Most of the wells were constructed by the then

Bureau of Public Works. These wells were test pumped with very low discharge

because the wells were commonly provided with very small casings as they were

intended for Level I barangay water supply sources only. Annex II-26 shows the

well data summary from the SWECO report.

The data provided by WATCON, Inc5. includes geo-resistivity survey results in 84

sites, distributed all over the province. The surveys were made for local water

4Water Resources Assessment and Development Plan for Sustainable Utilization of Water Resources in Nine (9) Local Government Units in Cavite Province, Philippines. SWECO International/WATCON, Inc. – United Nations Office for Project Services (UNOPS), 2004. 5Groundwater Resources Investigation and Geo-resistivity Survey for Various Projects. WATCON, Inc. 1991 – 2011


4-22

districts and residential and industrial developments to determine the presence,

thickness and depth of potential aquifer layer/s. Also included in the reports are

information on 465 wells, mostly gathered from well drilling contractors. No geo-

resistivity surveys were carried out in the Municipalities of Maragondon, Mendez,

Noveleta and Rosario. A summary of the data is presented in Annex II-27.

Available information shows that the Municipality of Maragondon has the least

number of information, which is limited to four(4) wells with only one (1) well

having lithologic logs and test pumping records. The Municipality of Dasmariñas

on the other hand, has the most number of well records. It must be mentioned

however that except for the records obtained from well drilling contractors, the

records are usually not complete for most of the wells particularly those on test

pumping and water quality test results.

Annex II-20 presents information on selected wells distributed within the

province. The selection of these wells was primarily based on the completeness

of records that can be used in the preparation of various thematic maps to

include specific capacity and transmissivity maps, and lithologic cross sections.

Test pumping records served as basis for the evaluation and assessment of

available groundwater in each of the municipalities and cities. Also, the selected

wells are representative of wells drilled at the coastal, flood plain, hilly and

elevated areas of the province. Figure 4.2-1 shows the location of these wells.

Figure 4.2-1 Selected Deepwell Location


4-23

The results of well inventory reflected the trend of urban and industrial

developments, which began as early as the 1970‘s. The main centers of

groundwater pumping at present are Dasmariñas City, Trece Martires, Gen.

Trias, Bacoor, Carmona, Imus, Tanza, and Silang. These areas have the biggest

number of groundwater permits granted as of December 2011. Records from the

NWRB show that there were no groundwater permits granted in the Municipality

of Gen. Emilio Aguinaldo and the Municipality of Indang. Level III water supply

systems in these towns rely on spring sources.

Spring Inventory

There are numerous springs and seepages in the province, most of which are

very low yielding. The bigger yielding springs are being utilized by the various

water districts and barangay waterworks systems as water supply sources. Some

of the productive springs are described as follows:

Amadeo Springs

Banga Spring Located at elevation 372 masml at the boundary of Minantok Kanluran and Minantok Silangan. This spring is provided with a spring box and is being utilized by Barangay MinantokSilangan residents as domestic water supply source.

Banio Spring Located in Barangay Minantok Silangan at elevation 370 mamsl at a ravine close to the Halang River. This spring is provided with a spring box and is being utilized by Barangay Banaybanay residents as a Level III water supply source.

Balite 1 and 2

Springs

These springs, also called Halang Falls, are located in Barangay Halang at elevations 278 and 300 mamsl, respectively. Discharge of Balite Spring measured in December 2003 was 0.527 MLD (6.1 lps) while discharge of Balite 2 Spring measured in May 1994 was 3.672 MLD (42.5 lps).

Bukal Spring Located in Barangay Halang at elevation 329 mamsl. This spring is provided with a spring box and is being utilized by Barangay Halang residents as a Level III water supply source.

Indang Springs

Ikloy Spring Located in Barangay Kayquit 2 at elevation 279 mamsl. It is the main water supply source of the Indang Water District. The spring discharge measured in 1994 was 18.058 MLD (209 lps) during the wet season and 15.638 MLD (181 lps) during the dry season.

Ulo Spring Located in Barangay Alulod at elevation 261 mamsl. With discharge of about 0.605 MLD (7 lps), this spring is being utilized by the Barangay Alulod Water Supply System.

Siloy Spring Located in Barangay Carasuchi in Indang at elevation 410 mamsl. The discharge measured in 1994 was 5.918 MLD (68.5 lps) during the wet season and 3.344 MLD (38.7 lps) during the dry season. This spring is being utilized as a Level III water supply source.

Saluysoy Spring Located in Barangay GuyamMalaki at the boundary with Alfonso. In December 2003, the spring discharge was measured at about 0.864 MLD (10 lps). It is being used as a barangay Level III water supply system.

Makabag Spring Llocated in Lumampong Balagbagat elevation 310 mamsl. In December 2003, the spring discharge was measured at about 1.037 MLD (12 lps). It is being used as a barangay Level III water supply system.

Bulbok Spring Located in Barangay Lumampong Balagbag at elevation 310 mamsl. In


4-24

December 2003, the spring discharge was measured at about 1.037 MLD (12 lps). It is being used as a barangay Level III water supply system source.

Sibol Spring Located in Barangay Pulo at elevation 318 mamsl. It is provided with a spring box and is being utilized as a Level III water supply source by the barangay residents.

Madilim Spring Located at Villa Verde Resort in Barangay Pulo at elevation 315 mamsl. It is provided with a spring box and is being utilized as a Level III water supply source by Barangay Tambo Malaki and Barangay Tambo Ilaya residents. Discharge measured during the wet season in 1994 was 3.871 MLD (44.8 lps) and 0.259 MLD (3.0 lps) during the dry season of the same year.

Makawayan

Spring

Located in Barangay Tambo Kulit at elevation 318 mamsl. It is provided with a spring box and is being utilized as a Level III water supply source by Barangay Tambo Kulit residents.

Ipie 1 and Ipie 2

Springs

Located in Barangay Kayquit 2 in a ravine approximately 50 meters apart. Ipie 1 Spring is provided with a spring box and is being utilized by Barangay Banaba Cerca residents. Ipie 1 Spring flow was measured in 1994 at 6.048 MLD (70 lps) and 5.011 MLD (58 lps) during the wet and dry seasons, respectively.

Makanda Spring Located in Barangay Kaytapos at elevation 285 mamsl. It is provided with a spring box and is being utilized as a Level III water supply source by Barangays Agus-os, Bancod and CalumpangCerca residents.

Niyog Spring Located at a ravine in Barangay Buna Cerca at elevation 313 mamsl. It is provided with a spring box and is being utilized as a Level III water supply source by Barangay Buna Cerca residents.

Mendez-Nunez Spring

Ulo Spring This spring is located at elevation 446 mamsl in Barangay Punongyan 2. This spring is provided with a spring box and it used to be the water supply source of the Mendez Water District. It was abandoned by the water district due tohigh cost of pumping to its service areas. Flow measured in December 2003 was 0.349 MLD (4.5 lps).

Silang

Lucsuhin Spring Located in Barangay Lucsuhin at elevation 329 masml. This spring is provided with a spring box and is being utilized by the Silang Water District as a water supply source. This spring has varying flows of 1.037 MLD – 1.728 MLD (12 – 20 lps).

Batas Spring Located in Barangay Batas at elevation 268 mamsl. This spring is provided with a spring box and is being utilized by the Silang Water District as a water supply source.

Cabangaan

Spring

Located in Barangay Cabangaan in a ravine close to a river. It is provided with a spring box and serves as a Level III water supply source of Barangay Cabangaan residents. Overflow measured in November 2003 was 0.173 MLD (2 lps).

Tagaytay City

Kaybubutong

Spring

Located in Barangay Sambong at elevation 395 mamsl, on the western side of the Tagaytay Ridge. It is the main water supply source of the Tagaytay City Water District. In 1994, discharge during the wet season was measured at 15.293 MLD (177 lps) while discharge of 14.550 MLD (168.4 lps) was measured during the dry season. Discharge of 11.232 MLD (130 lps) was measured in June 2004.

MatangTubig

Spring

Located in Sitio Matang Tubig in Barangay San Francisco at elevation 395 mamsl. It is one of the oldest sources of the Tagaytay City Water District. Spring discharge measured during the wet season in 1994 was 2.272 MLD (26.3 lps) and 0.705 MLD (8.16 lps) during the dry season of the same year.


4-25

Pulong Usiw

Spring

Located in Iruhin Central at elevation 545 mamsl. This spring is provided with a spring box and is being utilized by the Tagaytay City Water District as a water supply source. Spring flow measured in 1994 was 0.014 MLD (0.16 lps).

Kaybubutong

Spring 2

Located in Barangay Sambong at elevation 410 mamsl about 400 meters east of Kaybubutong Spring. The Tagaytay City Water District has plans to utilize this spring as an additional water supply source.

Trece Martires

Agtas Spring Located in Barangay Cabuco near the boundary with Barangay Aguado at elevation 95 mamsl. Discharge measured in November 2003 was about 0.864 MLD (10 lps). It is being utilized as a Level I water supply source for Barangay Aguado residents.

Water Quality

Recent water quality test results were obtained from the NWRB records covering

13 municipalities and two (2) cities of the province while WATCON, Inc.‘s records

from year 1991 to year 2011 covered 12 municipalities and two (2) cities.

The analysis of the physical properties such as color, turbidity, and odor generally

indicated no impurities that would be offensive to taste and smell were present in

most of the water samples from the whole province. High turbidity and color from

the samples collected in Gen. Aguinaldo, Dasmariñas, Gen. Mariano Alvarez,

Alfonso and Silang could be attributed to well design and construction, failure to

include screens or place well intakes opposite clayey and silty layers, incomplete

well development, and surface contaminants entering the granular space

between the casing and the borehole.

PARAMETER DETAILS

pH Value The pH value, which is the expression for the concentration of hydrogen ion ranged from 6.1 – 8.5. The pH value of 7 indicates neutral water while a pH value less than 7 indicates acidic water. Groundwater with very low pH value reacts to iron, and concrete and thereby causes corrosion problems. The PNSDW’s permissible limit for pH is 6.5 – 8.5, which is based on aesthetic consideration only.

Total Dissolved Solids (TDS)

TDS varied from 26 – 3,296 mg/l. It represents the amount of elements in the water, which is mainly salt. TDS in groundwater originate from natural sources, sewage, urban runoff, and industrial wastewater. High values of 580 – 3,296 mg/l were obtained in Cavite City and Noveleta, which are located near the coastline. The PNSDW’s permissible limit is 500 mg/l.

Chloride Chloride varied from 1.48 – 1,204.00 mg/l. Again, high concentrations of chloride of 383 – 1,204 mg/l could be observed in Cavite City. Chloride in groundwater originates from natural source, sewage, industrial effluents, urban runoff, and seawater intrusion. The PNSDW’s permissible limit is 250 mg/l.

Sodium Sodium from the NWRB’s records varied from 1.96 – 216.35 mg/l. It is usually associated with chloride and it has the same source as chloride. High sodium content was observed from one (1) sample in Noveleta. The PNSDW’s permissible limit is 200 mg/l.

Hardness Hardness varied from 15 – 594 mg/l. Hardness is due to the presence of naturally- occurring divalent cations, such as calcium, magnesium, and strontium


4-26

PARAMETER DETAILS

resulting from the contact of acidic groundwater with limestone and dolomite. Again, a high hardness is observed in areas near the coastline, particularly in Cavite City. The PNSDW’s permissible limit is 300 mg/l as CaCO3. Hardness beyond the permissible limit maybe acceptable in certain areas.

Calcium Calcium varied from 5 – 174 mg/l. Hardness is due to the presence of naturally occurring divalent cations, such as calcium, magnesium and strontium resulting from contact of acidic groundwater with limestone and dolomite. Again high hardness was observed in areas near the coastline. The PNSDW’s permissible limit is 300 mg/l as CaCO3.Hardness beyond the permissible limit may also be acceptable in certain areas.

Iron Iron varied from 0.05 – 9.02 mg/l. It is found in natural freshwater and may be present in drinking water as a result of the use of iron coagulants or the corrosion of steel and cast iron pipes during distribution. High concentration of iron will color laundry and give an ink-like taste. The PNSDW’s permissible limit is 1.0 mg/l.

Magnesium Magnesium varied from 1 – 50 mg/l. It is naturally-occurring but usually in very small concentrations. High manganese content will yield a blackish color upon oxidation or contact with air.

Manganese Manganese varied from 0.05 – 0.61 mg/l. It is naturally-occurring but usually in very small concentrations. High manganese content will give blackish color upon oxidation or contact with air.

Nitrate Nitrate varied from 0.05 – 0.15 mg/l. The nitrate concentration in groundwater can reach high levels as a result of leaching or run-off from agricultural land or contamination from human or animal wastes. The PNSDW’s permissible limit is 50 mg/l.

Flouride Flouride varied from 0.04 – 0.67 mg/l. The PNSDW’s permissible limit is 1.0 mg/l.

Aluminum Aluminum varied from 0.004 – 0.157 mg/l. The PNSDW’s permissible limit is 0.2 mg/l. Aluminum sulfate is used in water treatment as a coagulant.

Lead Lead varied from 0.006 – 0.01 mg/l. The PNSDW’s permissible limit is 0.01 mg/l. Lead may be present in water primarily from plumbing systems containing lead pipes, solder fittings. It is rarely present in water supply as a result of dissolution from natural sources.

Chromium Chromium from a water sample collected in Carmona was 0.001 mg/l. The PNSDW’s permissible limit is 0.05 mg/l. It is widely distributed in the earth’s crust and commonly occurs in wastewater in certain industries as chromium plating.

Due to relative uniformity of the hydro-geologic environment and similar

residency time of groundwater in the same pyroclastic rocks, the quality of

groundwater in the province is almost the same except from those wells drilled

near the coastline. Higher TDS, magnesium, chloride, hardness in Cavite City

could be attributed to saline water intrusion. Decline of piezometric water level

below mean sea level due to pumping in this area resulted to inland movement of

seawater.

4.2.2 Results of Geo-resistivity Survey

A geo-resistivity survey is a non-intrusive method of groundwater resources

investigation which is based on measuring the electrical resistance properties of

underground rocks layers. The presence of water and the amount of dissolved


4-27

solids are the principal controls on the flow of electric current. The resistivity

decreases as porosity, hydraulic conductivity, water content, and water salinity

increase. Lesser resistance indicates the rocks‘ lower ability to transport water

and less chances of finding productive aquifer. Electrical resistivity values of 30 -

200 ohm-meter are normally associated with increasing ability of underground

layers to transmit water. The points with these values are normally selected as

sites for drilling of wells.

From the geo-resistivity surveys carried out in 84 sites in the province, a total of

15 Vertical Electrical Sounding (VES) points were selected to be able to

represent the electrostratigraphic sections near the coastline, at the low lying

areas, the central hilly areas, and the elevated areas of the province. Annex II-

21 presents the summary of the geo-resistivity data while Figure 4.2-2 shows the

location of the selected VES stations. Medium to high resistivity values indicate

predominance of coarse-grained materials, while very low resistivity values

indicate presence of very fine-grained materials, which are considered as very

poor aquifer owing to their very low permeability. This also refers to formations

saturated with brackish to saline water.

Figure 4.2-2 VES Location

Electrostratigraphic Section A – A’, which represents the coastal areas, shows

the potential aquifer layer located at 80 – 100 meters below mean sea level with

a thickness of about 100 meters (Figure 4.2-3). The potential aquifer section

consists of intercalation of tuff, tuffaceous sandstone, clay, and silt. A very low


4-28

resistivity value of 0.8 ohm-meter determined at the Fort San Felipe in Cavite City

indicates formations saturated with saline water.

Figure 4.2-3 Electrostratigraphic Section A-A’

Electrostratigraphic Section B – B’, which represents the low lying areas of the

province, shows the potential aquifer layer located near the surface down to

about 100 meters below mean sea level. Resistivity values of 22.7 – 24.0 ohm-

meter correspond to intercalation and/or mixture of sand, gravel, clay, silt, and

tuffaceous sandstone with predominance of fine-grained materials. This is the

section being tapped into by the productive wells in Naic, Tanza, and Bacoor.

Electrostratigraphic Section C – C’ represents the central and hilly areas of the

province and shows better potential in terms of resistivity values. The blue color,

that shows resistivity values of 78.0 – 100 ohm-meter, corresponds to tuff and

tuffaceous sandstone intercalated with lenses or thin layers of clay/shale. This is

the section being tapped into by the productive wells in Indang, Silang, and

Carmona.

Electrostratigraphic Section D – D’ represents the upland areas of the province

and shows medium to high resistivity values. These correspond to tuff and

tuffaceous sandstone intercalated with lenses or thin layers of clay/shale. These

sections are the aquifer layers being tapped by the productive wells in Alfonso

and Tagaytay City. Lower well yields in these areas are not due to geologic

composition but due to other hydrogeologic consideration, depth of burial,

available recharge, etc.


4-29

It must be mentioned however that the interpretation of the geo-resistivity survey

results must be correlated with the geology of the area and with the lithologic and

test pumping results of existing wells. For instance, geo-resistivity survey results

in Tagaytay City and in Imus cannot be compared. The aquifer layers in Tagaytay

are located at greater depths due to its higher elevation and it is more compacted

due to its deeper burial. A geo-resistivity survey needs to be done particularly in

areas where available data is limited.

4.2.3 Water Balance

Meteoric or atmospheric water in the form of rainfall represents by far the

greatest source for replenishing surface and subsurface waters. It is therefore

important to assess monthly, yearly, and long term rainfall variations; the total

rainfall available; as well as its dependency on the geographic and topographic

features of the catchment areas. Almost all groundwater, including surface and

meteoric water are considered as part of the hydrologic cycle. Hence, rainfall

data are important input for evaluating groundwater recharge and recoverable

groundwater. Evaporation and transpiration represent the loss of water in the

catchment area.

The water balance components: evaporation, effective rainfall, runoff, and

recharge to the groundwater system were computed using the ARMA Hydrologic

Model. The average monthly rainfall records obtained from the Philippine

Athmospheric, Geophysical and Astronomical Administration‘s (PAGASA)

stations in Ambulong, Nasugbu, Amadeo, Sangley, Bacoor were used. Records

from the Tagaytay station were not utilized due to its shorter period of monitoring

and records were believed to be less reliable.

Under natural conditions, groundwater reservoirs in Cavite are recharged

perennially by precipitation on the outcrop covering the whole province from

Tagaytay City to the south to Cavite City to the north. Local recharge may also

occur as seepages from streams and rivers during periods of high flows but this

is a minor contributory factor as it is groundwater that provides stream flows most

of the time.

ARMA Model

The ARMA model was developed to provide values of monthly runoff and

groundwater recharge from which the groundwater resources potential of a given

area can be evaluated.

Monthly rainfall and temperature of the model area were calculated by

transporting the average rainfall of the Nasugbu, Ambulong, Amadeo, and

Sangley Stations. These measuring stations are located in the same climatic

zone. Annex II-19 presents the rainfall and temperature from the different

climatological stations.


4-30

Because of the differences in topographic characteristics of the Province of

Cavite, the province was divided in three (3) sub-areas. Figure 4.2-4 shows the

sub-division of the three (3) model areas.

Figure 4.2-4 ARMA Model Area

In determining the effective rainfall and runoff components, the runoff coefficient

was assumed according to vegetative cover, type of soils, slope, and land use.

Slope, land use, geology, and soil maps presented in Figure 2.1-6 – 2.1-8 in

Chapter 2 were used for the determination of the runoff coefficients. The runoff

coefficients varied according to the type of vegetative cover, type of soil, and

slope.

Effective Rainfall, Direct Runoff and Groundwater Recharge

Figures 4.2-5 – 4.2-7 present the water balance components in Areas 1 – 3. Also

presented in the figures are the tables on mean annual rainfall, mean areal

temperature, evapotranspiration, effective rainfall, direct runoff, recharge to the

groundwater system, and generated discharge.

As shown in Figure 4.2-5, which covers Area 1, the effective annual rainfall of

1,280 mm is about 48% of the annual rainfall; while direct runoff of 1,176 mmis

44% of the annual rainfall. The negative effective rainfall values of -33 mm to -

113 mm from December to April indicate soil moisture deficit during these months

which needs to be satisfied before direct runoff and recharge can take place.

However, considering that there are still irrigated farmlands, water imported from

surface water sources will reduce soil moisture deficit and promote recharge

provided that the piezometric level of the water table aquifer is not close to the

ground surface.


4-31

Figure 4.2-5 Water Balance – Area 1

The table shows that the mean annual recharge to the groundwater system is

104 mm, which is about 4% of the annual rainfall. The recharge occurs from May

to November when the soil moisture deficit has been satisfied. During this period

the available rainfall is adequate enough to force downward percolation from the

unsaturated zone. Recharge is fairly constant from June to October.

Input Values

Mean Areal Mean Areal Evapotrans- Evapotrans- Effective Direct Recharge Generated Baseflow Watershed Area in sq. km. 531.2

Month Rainfall Temperature piration "1 piration "2 Rainfall Runoff to GW Disharge Length of the Watershed in km.

mm C mm mm mm mm mm cum/s cum/s mm Watershed Condition Poor

Jan 28 26.4 101 101 -74 0 -74 0.00 0.00 0 Rice 0.29

Feb 12 27.0 108 111 -96 0 -96 0.00 0.00 0 Built Up Areas & Wetlands 0.31

Mar 18 28.3 123 137 -104 0 -104 0.00 0.00 0 Coconut w ith Coffee, Banana, Fruit Trees 0.04

Apr 26 29.7 139 167 -113 0 -113 0.00 0.00 0 Grass, Shrubs, Bushes. Pasture, Golf Course 0.30

May 207 29.7 134 167 73 27 46 0.00 0 Crops (Banana, Sugarcane, Corn, Pineapple) 0.07

Jun 318 28.9 122 150 196 119 77 18.33 0 Curve Number; CN 66.63

Jul 522 28.1 108 133 414 317 97 63.73 0 U 0.50

Aug 586 27.9 104 129 481 381 101 79.46 0 Max.storage capability;Fp, mm 127 Watershed Condition

Sep 393 28.0 110 130 284 196 88 42.66 0 Ia, mm 25 Poor

Oct 312 28.0 112 131 200 122 78 31.43 0 K 0.180

Nov 164 27.8 113 126 51 15 37 9.10 0 Annual Infiltration, mm 104

Dec 71 26.7 104 106 -33 0 -33 5.59 0 Percentage of Annual Rainfall 4

Annual 2,658 1,378 1,589 1,280 1,176 104 Annual Net Change in GS, mm 104

Mean 221 28.1 115 132 107 98 20.86 GW recharge cum/yr 55,180,401

% of AR 52 60 48 44 4 GW recharge cum/d 151,179

Evapotranspiration "1 - Traw ons Equations, "2 - Thorntw aites Equations

Auto Regressive Moving Average (ARMA) Hydrological Model

Water Balance Simulation Run - ARMA Model Area 1

-200

-100

0

100

200

300

400

500

600

700


(mm

)

Month

ARMA Model Area IWater Balance Components

Groundwater Recharge

Run Off

RainfallEvapotranspiration

Effective Rainfall

Figure 6.9 Water Balance - Area 1


4-32

As presented in Figure 4.2-6 the effective annual rainfall in Area 2 of about 2,086

mm is 61% of the annual rainfall; while direct runoff of 1,870 mm is 55% of the

annual rainfall. The negative effective rainfall of – 15 mm to – 104 mm from

December to April is to be satisfied before direct runoff and recharge could take

place. Located at the central portion of the province and at higher elevation, Area

2 has no irrigated farmlands. Vegetative cover consists of fruit bearing trees and

the piezometric level in this area is deeper when compared to Area1.


Input Values



mm C mm mm mm mm mm cum/s cum/s mm Watershed Condition Fair

Jan 43 25.6 98 91 -55 0 -55 0.00 0.00 0 Rice 0.03

Feb 16 26.2 106 100 -89 0 -89 0.00 0.00 0 Built Up Areas 0.22





Jul 666 27.2 102 117 564 467 97 74.13 0 U 0.46


Sep 484 27.1 106 116 378 289 89 48.25 0 Ia, mm 23 Fair

Oct 418 27.1 108 116 310 226 85 41.18 0 K 0.180









-200

-100

0

100

200

300

400

500

600

700

800


(mm

)

Month

ARMA Model Area 2Water Balance Components


Run Off


Effective

Figure 6.10 Water Balance - Area 2


4-33

Water balance components for Area 3 are shown in Figure 4.2-7. The effective

annual rainfall of 2,480 mm is 69% of the annual rainfall; while direct runoff

of2,025 mm is 56% of the annual rainfall. Negative effective rainfall of – 14 mm to

– 87 mm from December to April corresponds to the soil moisture deficit during

these months. The mean annual recharge to the groundwater system is 455 mm

which is 13% of the annual rainfall. Recharge occurs from May to November

when the soil moisture deficit has been satisfied. During this period the available

rainfall is adequate enough to force downward percolation from the unsaturated

zone.


Input Values



mm C mm mm mm mm mm cum/s cum/s mm Watershed Condition Poor

Jan 66 24.1 80 78 -14 0 -14 0.30 0.30 3 Rice 0.29

Feb 14 24.7 88 85 -75 0 -75 0.03 0.03 0 Built Up Areas & Wetlands 0.18





Jul 696 25.6 84 96 612 488 124 46.76 0 U 0.61


Sep 451 25.6 89 96 361 252 109 26.28 0 Ia, mm 31 Poor

Oct 479 25.5 88 95 391 280 111 30.59 0 K 0.180









-200

-100

0

100

200

300

400

500

600

700

800


(mm

)

Month

ARMA Model Area 3Water Balance Components


Run Off


Effective


4-34

Groundwater Resource Potential

Based on the water balance analysis, the total groundwater replenishment for the

whole Province of Cavite is estimated at 298.48 million cum per year or an

average of 817.755 MLD. The total recoverable groundwater is 208.94 million

cum per year or 572.429 MLD. Table 4.2-1 presents the recharge and

recoverable groundwater for each of the towns and cities in the province.

Table 4.2-1 Recharge and Recoverable Groundwater per City/Municipality

City/ Municipality Model Area Area

sq. km Recharge

MLD Recharge

lps Recoverable

MLD Recoverable

lps

Alfonso 3 64.6 81.060 938 56.742 657

Amadeo 2,3 47.9 44.094 510 30.866 357

Bacoor 1 25.0 7.329 85 5.130 59

Carmona 1,2 40.2 17.677 205 12.374 143

Cavite City 1 11.8 3.459 40 2.421 28

Dasmariñas 1,2 90.1 39.619 459 27.734 321

Gen. Emilio Aguinaldo 2 51.1 29.960 347 20.972 243

Gen.Mariano Alvarez 1,2 11.4 5.013 58 3.509 41

Gen. Trias 1,2 87.0 38.256 443 26.779 310

Imus 1 89.0 26.090 302 18.263 211

Indang 2,3 81.8 75.301 872 52.711 610

Kawit 1 13.4 3.928 45 2.750 32

Magallanes 2 78.6 46.083 533 32.258 373

Maragondon 1,2 139.8 61.474 712 43.032 498

Mendez 3 16.7 20.955 243 14.669 170

Naic 1,2 78.6 34.562 400 24.194 280

Noveleta 1 5.6 1.642 19 1.149 13

Rosario 1 3.6 1.055 12 0.739 9

Silang 2,3 141.7 130.442 1,510 91.309 1,057

Tagaytay City 3 74.0 92.855 1,075 64.998 752

Tanza 1 72.4 21.224 246 14.857 172

Ternate 1 43.5 12.752 148 8.926 103

TreceMartires City 2 39.1 22.924 265 16.047 186

Total 1,306.9 817.755 9,465 572.429 6,625

Source: Water Resources Assessment and Development Plan in Nine (9) LGUs in Cavite Province, SWECO-WATCON. 2004

Rainwater that infiltrates into the ground is discharged by drainage into the

various river systems, by pumping wells and by groundwater flow through the

water table and artesian aquifers into the Manila Bay or the Laguna de Bay.

The recoverable groundwater depends on the hydraulic properties of the aquifer

and the available drawdown in a given location. The wells have to be distributed

in such a way that minimal well to well interferences drawdown is developed and

yet be able to capture the greatest amount of recharge without running out of

available drawdown or causing unacceptable water quality. The present

distribution of wells in the province is causing over withdrawal in some

municipalities while at the same time groundwater is lost through unutilized flows

in some of the towns where groundwater withdrawal through wells is minimal.


4-35

4.2.4 Aquifer and Characteristics

Composition and Extent

The geological map of Cavite as supplemented by the stratigraphic logs of

existing wells in the province provided a picture of the composition and extent of

the potential aquifer layers. However, the construction of accurate aquifer

geometry could not be made because of the generalized description of drill

cuttings and the differences in the description made by different drillers.

From the logs of the inventoried wells, 13 wells with strata logs were selected for

the presentation of the lithologic sections near the coastline, at the low lying

areas, the central hilly areas, and the elevated areas of the province. Figure 4.2-

8 shows the location of the selected wells, for which lithologic sectional analysis

were made.

In terms of groundwater availability, the blue color that represents permeable

sand and gravel has the highest potential for groundwater abstraction followed by

the green color that represents permeable tuffaceous sandstone and tuff. The red

color represents a semi-permeable mixture of sand, gravel, clay, and silt or very

fine-grained tuffaceous sandstone while the orange color represents

impermeable clay, silt, and shale.

Figure 4.2-8 Lithologic Section


4-36

Lithologic Cross Section A – A’ represents wells drilled in the coastal areas,

showing intercalation of permeable and permeable sediments. The permeable

sections are generally located at shallow depths.

Lithologic Cross Section B – B’ represents wells drilled in the low lying areas

farther from the coastline, and shows intercalation of permeable and

impermeable materials with predominance of coarse-grained sediments.

Lithologic Cross Section C - C’ represents wells drilled in the hilly central area

of the province and shows intercalation of permeable and impermeable materials

with predominance of coarse-grained sediments.

Lithologic Cross Section D - D’ represents wells drilled in the upland area of

the province, shows intercalation of permeable and impermeable materials with

predominance of fine-grained materials at Well No. 83 in Barangay Guinhawa,

Tagatay City. Groundwater availability in the upland areas is not solely

dependent on the geologic composition of the underlying formations but on other

hydrogeologic considerations as well.

It is clear that no single extensive aquifer exists in the province. The aquifer

system consists of numerous aquifers, which, taken as a whole, function as one.

It is composed of interconnected aquifers intercalated with lenses or thin layers of

impermeable to semi-permeable materials.

The description of the penetrated strata indicates that the aquifers consist mainly

of tuff and tuffaceous sandstone, while the confining layers consist of clay and

clayey tuff. It should be mentioned that the depth of burial affects the permeability

of geological units and consequently aquifer. Permeability of the aquifer

decreases gradually with increasing depth of burial. Higher permeability at the

upper portion of the aquifer is due to a lesser degree of consolidation and

compaction and also being near the surface, a higher degree of weathering.

Water Level Conditions and Movement of Groundwater

Studies on water level conditions and groundwater movement made by the

National Water Resources Council and the NHRC in the early 1980‘s showed the

static water level and the general flow pattern of groundwater movement. Figure

4.2-9 shows flat to steep gradient reflecting the general topography of the area.

Water gradient at higher elevations, particularly in Tagaytay City was steeper and

it became flatter towards the lower reach near Manila Bay.


4-37

Figure 4.2-9 Groundwater Level - 1980

A more detailed water level contours and groundwater flow direction was

prepared in 2004 by the SWECO International and WATCON, Inc. for the Water

Resources Assessment and Development Plan for Sustainable Utilization of

Water Resources in nine (9) Local Government Units in Cavite Province,

Philippines with the assistance of the United Nations Office for Project Services.

Figure 4.2-10 shows the contours of elevation of groundwater level and direction

of groundwater flow before 1990, prior to the start of intensive groundwater

withdrawals in some parts of the province. The direction of groundwater flow was

towards the northwest to Manila Bay and towards the northeast towards the

Laguna de Bay.


4-38

Figure 4.2-10 Elevation of Groundwater Level before 1990

Figure 4.2-11 shows the contours of groundwater level elevation in 2003. It

shows that in Silang, Trece Martires, General Trias, General Mariano Alvarez,

and Carmona, groundwater contours were converging toward numerous centers

of withdrawals where water districts and residential and industrial developments

are located. In the northern part of General Trias, contours of elevation of

groundwater level were already at sea level. A further increase in groundwater

withdrawal in this area could cause a reversal of the hydraulic gradient from the

sea and consequently bring about saline water intrusion or the upconing of the

underlying saltwater edge into wells which are further inland.


4-39

Figure 4.2-11 Elevation of Groundwater Level - 2003

Figure 4.2-12 shows the change in water level between 1990 and 2003. In areas

of intensive withdrawal in Silang and General Trias, groundwater levels have

been lowered by as much as 25 meters, and in General Mariano Alvarez and

Carmona by more than 25 meters. In Dasmariñas, the water level has been

lowered by 25 – 50 meters. The average decline of water level in the areas of

intensive withdrawal was about 15 meters over the 13 years period, which was

more than 1 meter per year.


4-40

Figure 4.2-12 Groundwater Level Change 1990-2003

Records of recently drilled wells show static water levels of 63.10 m bgl (121.05

m amsl) in Dasmariñas, 64.00 - 101.95 mbgl (164.01 – 236.00 m amsl) in Silang,

43.65 m bgl (146.35 m amsl) in Magallanes, 19.8 m bgl (75.2 m amsl) in Trece

Martires, 16.2 m bgl (9.8 m amsl) in Carmona, and 6.10m bgl (1.9 m asml) in

Imus.

In Barangay Javalera in the Municipality of Gen. Trias, groundwater withdrawal

made for the industrial estate in the area resulted in the decline of static water

level from 7.1 mbgl in 1990 to 25.5 mbgl in 2000 for a total decline of 18.4 meters

during the 10-year period. Records of the Tagaytay City Water District wells on

the other hand show more or less the same water level in some of the wells,

while other wells showed minimal decline of water levels.

The decline of static water level in the centers of big groundwater withdrawal was

due to groundwater mining from wells distributed in small area, which caused

acceleration in decline rate, as more of the saturated was dewatered. It is

expected that the recharge within the well capture zone or within the wellfield will

increase due to the available storage in the upper portion of the aquifer, which

could accommodate additional runoff. Consequently, it can be expected that

river base flow will decrease on the account of increase groundwater withdrawal.

Near the coast, particularly Cavite City, all deepwells have been abandoned due

to the decline of water level below mean sea level that resulted to saline water

invasion. Overdevelopment of groundwater resources through wells in areas near


4-41

the coastline will ultimately result to inland movement of seawater once the cone

of depression created by pumping reaches the sea.

Aquifer Hydraulic Properties

The worth of an aquifer as water supply source depends on two inherent

characteristics; its ability to store and transmit water. The principal method of

analysis of groundwater hydraulics is through the test pumping of the well to

stress the aquifer with the flow rates and water levels measured during the test.

These measurements are then used in an appropriate well flow equation to

calculate the hydraulic characteristics of the aquifer.

There are two types of aquifer tests, which are commonly performed on newly

constructed wells: the step-drawdown test and the constant discharge test. In the

step-drawdown test, the well is pumped with varying discharge rates for relatively

short periods, whereas in a constant discharge test, the well is pumped

continuously for a significant length of time with one discharge rate. Data from

both tests are analyzed to determine hydraulic characteristics of the aquifer and

efficiency of the well, which are then used to determine sustainable well yield.

Test pumping results also serve as baseline data for future evaluation of well

performance.

Aquifer Loss and Well Loss

From the well data summary in Annex II-20, there are 19 wells out of 84 wells

with step-drawdown test records. There are 11 wells with an aquifer loss

coefficient of less than 300 sec/m2while there are five (5) with an aquifer loss

coefficient of more than 1,000 sec/m2.To illustrate the significance of the aquifer

loss coefficient,withdrawal of 0.864 MLD (10 lps) will create 3.0 meters drawdown

due to formation loss for a well with aquifer loss coefficient of 300 m/s2 and 10

meters drawdown due to aquifer loss for a well with aquifer loss coefficient of

1,000 m/s2.

Aquifer loss coefficient of less 100 m/s2 was determined from a well in Silang

drilled near the Marikina Fault while intermediate values of 200 – 400 s/m2were

determined from wells drilled in Imus, Bacoor, and Kawit and more than 1,000

s/m2 in some areas in Silang, Dasmarinas, Tagaytay City, and Magallanes.

Aquifer Yield

As also presented in Annex II-20, all the wells have specific capacity values

while only 80 wells with transmissivity values. Transmissivity is the rate at which

water flows through a vertical strip of the aquifer 1 meter wide and extending

through the full saturated thickness, under a hydraulic gradient of 1.The specific

capacity of a well is its yield per unit of drawdown usually expressed as liters per

second per meter of drawdown.


4-42

The specific capacity values which ranged from 0.35 – 3.60 lps per meter of

drawdown indicate wells with poor to high yielding properties. Figure 4.2-13

shows the distribution pattern based on the test pumping records collected during

this study. High specific capacity values of more than 3 lps per meter of

drawdown were observed in some parts of Trece Martires, Naic, Gen. Trias,

Carmona, and Silang, while low specific capacity values of less than 1 lps per

meter of drawdown were observed in Alfonso, Amadeo, Tagaytay City,

Magallanes, Ternate, and parts of Silang.

The high specific capacity of wells in Silang could be attributed to its location,

being within the Marikina Fault, and in areas where thick layers of coarse-grained

pyroclastic rocks are present.

Figure 4.2-13 Specific Capacity

From the same Annex II-20, the transmissivity of selected wells ranged from

0.18 – 7.06x10-3 m2/s, which indicates aquifer with very poor to very good yielding

properties. Again, very high transmissivity values of more than 5 x10-3 m2/s could

be observed among wells drilled within the Marikina Fault. Wells drilled at the

higher elevations showed transmissivity of less than 1.0 x 10-3 m2/s, which

indicate aquifer with very low yielding properties.

There is no information on the storage properties of the aquifers from any of the

previously conducted test pumping. Storage coefficient of water table could be

assumed to range from 0.001 to 0.0001 and less than 0.0001 for artesian

aquifers.


4-43

Figure 4.2-14 Transmissivity

Yield of Individual Wells

The total drawdown in a pumping wells were calculated from the following:

Jacob‘s formula (BQ + CQ2) for the first 60 minutes of pumping; the effect of long

term pumping without recharge; interference‘s from other pumping wells; and

correction for the decrease of saturated thickness of aquifer and decline of water

level due to seasonal effect.

Annex II-22 presents the sustainable yields of 16 selected wells all over the

province. The estimated sustainable yield of individual well was based on

allowable drawdown and well designs and not based on recoverable discharge in

a given area. As shown in the table, wells in Bacoor, Imus, Trece Martires, and

Indang have the biggest sustainable yield of more than 2.592 MLD (30 lps) while

wells in Noveleta and Gen. Mariano Alvarez have the lowest sustainable yields of

less than 0.432 MLD (5 lps).

4.2.5 Summary of Groundwater Resource Assessment

On Groundwater Availability

With an average recoverable recharge of 572.429 MLD and a projected water

demand of 1,756 MLD by 2040 (excluding agriculture demand) it is clear that

groundwater resources through wells are not capable of supporting the long-term

water requirements of the province.


4-44

At present, water demands in the Municipalities of Bacoor, Cavite City, Carmona,

Dasmariñas City, General Trias, General Mariano Alvarez, Silang, Imus, Kawit,

Noveleta, Rosario, and Tanza have exceeded their recoverable discharges.

Large-scale groundwater mining has to be resorted to unless other water supply

sources can be developed and tapped at the soonest possible time.

It is only in Tagaytay City and the Municipalities of Amadeo, Gen. Emilio

Aguinaldo, Indang, Naic, Alfonso, Ternate, Mendez, Magallanes, and

Maragondon where recoverable groundwater recharge is higher than the

municipal/city water demands. As part of mitigating measure, surplus

groundwater from the Municipalities of Amadeo, Gen. Emilio Aguinaldo, Indang,

Naic, Alfonso, Ternate, Mendez, Magallanes, and Maragondon can be harnessed

to support portions or a part of the deficit in the nearby towns.

Development of groundwater resources through wells is not recommended in

Tagaytay City. Also, elevated areas of the Municipalities of Ternate and

Maragondon are not being considered as potential well sites due to poor aquifer

potential in these areas. The coastal areas of the Municipalities of Naic and

Ternate are also to be avoided due to possible saline water intrusion.

Water Resources Conjunctive Use

To support the long-term water requirements of the province, the conjunctive use

of surface water and groundwater sources, or the importation of water from

nearby provinces becomes imperative. Because groundwater resources have

become fully appropriated in some municipalities, whatever water is available

must be used. The conjunctive use of both surface water and groundwater will

require a detailed knowledge of the hydrogeology of the basin, records of

pumping and recharge rates, and updates on groundwater levels and quality.

This will involve coordinated and planned operation of both surface water and

groundwater resources to meet water requirements in a manner whereby water is

conserved. The basic difference between the usual surface water development,

with its associated groundwater development and conjunctive use, is that the

separate yields of the former can be replaced by the larger and more economic

joint yields of the latter. During periods of above normal precipitation, surface

water is utilized to the maximum extent possible. During the dry periods, limited

surface water is supplemented by pumping groundwater.

4.2.6 Sewerage, Septage and Water Quality

Both water quantity and quality become dominant issues with the growth in

population and economic activities and the corresponding increasing demand for

water as a consequence of the same. In the case of the Province of Cavite, this

becomes more pronounced given the lack of any septage collection and treatment

system, as well as the absence of any piped waste water collection and treatment

system or a centralized sewerage system.


4-45

Due to the lack of the necessary sewerage and septage systems, septic tank

effluent is generally allowed to leach into the ground while untreated waste water

from households and industrial establishments is returned to the water sources. In

some cases, septic tank effluents are discharged into nearby drains, ditches, or

watercourses, which cause particular problems especially in coastal areas where

the ground water table is relatively high.

4.3 GENERAL CONCLUSIONS

The analysis made in the foregoing points to the following salient findings:

With an average recoverable recharge of about 572 MLD and a projected water demand of 1,756 MLD by 2040 (excluding agriculture demand), groundwater resources will not be adequate to meet the long-term water requirements of the province. Groundwater mining, which could adversely affect the environment and which already appears to be occurring in some cities/municipalities, may be bound to increase if no alternative sources of water are developed.

It is only in Tagaytay City and the Municipalities of Amadeo, Gen. Emilio Aguinaldo, Indang, Naic, Alfonso, Ternate, Mendez, Magallanes, and Maragondon that recoverable groundwater recharge is higher than the municipal/city water demands.

Use of groundwater resources through additional wells is not recommended in Tagaytay City. The same is true with the elevated parts of the Municipalities of Ternate and Maragondon due to the poor aquifer potential in these areas, as well as the coastal areas of the Municipalities of Naic and Ternate where there is potential for saline water intrusion.

To support the medium to long-term water requirements of the province, the conjunctive use of surface water and groundwater sources becomes necessary.

In the absence of a system-wide wastewater treatment and collection system, immediate interventions to address the dire environmental effects of this deficiency is imperative.


5-1

CHAPTER 5 WATER RESOURCE DEVELOPMENT FRAMEWORK

5.1 PRINCIPLES FOR INTEGRATED WATER RESOURCES DEVELOPMENT AND MANAGEMENT

Water is a valuable and limited natural resource and its development should be

governed by principles that will benefit all the stakeholders. The Cavite integrated

water resources development and management framework aims to harness the

potential of provincial water resources in an economically sustainable manner to

spur inclusive development of all stakeholders. The framework is anchored on five

(5) pillars, namely:

Water Resource Use Optimization by advocating rational use and

combatting unproductive losses implemented under a viable water governance system

Balanced Development of all types of available water, performed within

hydrographic boundaries in accordance with basin morphology and considering the unique climatic conditions

Private-Public Partnership not only in governance, but also in funding, maintenance, planning and development.

Strengthened Governance Institutions and Linkages, based on legal

mandates

Transparency and Accountability through open exchange of vital information

Water resources development shall be governed by balancing the development

and management of both surface and underground water resources. In view of

conflicting uses and demands, the concerned institutions need to coordinate with

all stakeholders to rationalize the use and allocation of this scarce resource

based on current laws and regulations.

Given the existing institutional and legislative frameworks currently in place,

implementing an Integrated Water Resource Management System (IWRMS) in

the province of Cavite is likely to require significant reforms in all aspects of

project development. A clear provincial water policy which imbeds the principles

of sustainable management of water resources in the governance framework

needs to be put in place to enable a more effective mobilization of resources to

spur development in the right direction.

The implementation of new infrastructure projects on water resource

development has to take into account environmental and social impacts and the

basic requirement to be financially and economically viable to achieve long-term

sustainability.


5-2

The framework for implementing the IWRMS is conceptually summarized in

Figure 5.1-1.

Figure 5.1-1 Framework for the Cavite Integrated Water Resource Management System

To implement IWRMS, the Provincial Government of Cavite has to put in place

the required institutional arrangements and legal frameworks needed to:

Enable the Provincial Government to coordinate the management of water resources, in conjunction with concerned institutions based on legal mandates;

Mobilize a consortium of stakeholders involved in project development and decision making;

Clarify the entitlement and responsibilities of users and water providers;

Formalize a more rational allocation of water;

Provide legal status for water management institutions at sub-national levels; and

Imbed the principles of sustainability in the use of water resource.

5.2 THE KEY ISSUES

On the basis of the sector scanning and assessment detailed in the preceding

chapters, a number of key issues begin to surface. In summary, these are:

Institutional and Legal Framework

Policies and Strategies

Infrastructure Development

Management Systems

Water Resources

Water Supply

Wastewater and Environmental Control

AgricultureHydropower

and Other Uses

INTEGRATED WATER RESOURCE MANAGEMENT SYSTEM


5-3

Widening Demand vs Supply Gap

The present water supply and distribution systems covering the Province of

Cavite is no longer able to meet the present and future aggregate demand for

water. Groundwater abstraction in a number of areas in the Province has already

reached critical points causing decreased groundwater levels and resulting in

groundwater mining and salt-water intrusion in coastal areas (Table 5.2-1).

Table 5.2-1 2012 Groundwater Supply-Demand Gap (in MLD)

CITY/ MUNICIPALITY

Recoverable Ground Water

Domestic Demand

Industrial Demand

Recreation Demand

Agriculture Demand

Total Groundwater Withdrawal

Surplus (Deficit)

District I

Cavite City 2.42 23.16 6.27 - 0.01 29.43 (27.01)

Kawit 2.75 16.93 1.66 0.21 0.69 19.49 (16.74)

Noveleta 1.15 8.09 0.05 - 0.74 8.88 (7.74)

Rosario 0.74 19.28 20.16 - 0.76 40.20 (39.46)

District II

Bacoor 5.13 98.52 0.42 - 2.58 101.53 (96.40)

District III

Imus 18.26 59.85 10.86 - 7.95 78.66 (60.40)

District IV

Dasmariñas 27.73 95.19 14.22 1.61 15.45 126.47 (98.74)

District V

Carmona 12.37 10.53 12.39 3.21 1.74 27.87 (15.50)

Gen.Mariano Alvarez

3.51 22.01 0.48 - 0.72 23.21 (19.70)

Silang 91.31 35.52 15.95 0.90 25.59 77.96 13.35

District VI

Trece Martires 16.05 16.91 7.00 1.78 12.06 37.74 (21.70)

Amadeo 30.87 4.63 - - 2.39 7.02 23.85

Gen. Trias 26.78 40.04 27.80 1.75 14.57 84.16 (57.39)

Tanza 14.86 22.01 2.57 - 17.92 42.50 (27.64)

District VII

Tagaytay City 65.00 13.72 0.08 1.39 4.09 19.29 45.71

Alfonso 56.74 6.57 0.16 0.54 26.25 33.51 23.23

Gen. E. Aguinaldo 20.97 2.20 - - 6.08 8.28 12.69

Indang 52.71 8.53 0.10 - 4.18 12.82 39.89

Magallanes 32.26 2.16 0.81 - 9.42 12.39 19.87

Maragondon 43.03 4.39 - - 2.59 6.98 36.05

Mendez 14.67 4.34 - 0.06 2.75 7.15 7.52

Naic 24.19 8.93 0.99 - 3.20 13.13 11.07

Ternate 8.93 1.04 - 0.58 0.77 2.39 6.54

TOTAL 572.43 524.57 121.98 12.02 162.50 821.06 (248.63)


5-4

Infrastructure Backlog

With an estimated 572 MLD of available groundwater to supply domestic

demand, the current supply is not enough to cater to the future requirement for

potable water (Table 5.2-2)

Table 5.2-2 Water Requirements Summary (MLD), 2012-2040

Category 2012 2015 2020 2025 2030 2035 2040

Domestic 525 538 669 838 1,063 1,297 1,549

Industrial 122 136 160 172 184 188 192

Recreation 12 12.5 13 13.5 14 14.5 15.2

Agriculture 1,094 1,090 1,087 1,077 1,074 1,077 1,089

TOTAL 1,753 1,777 1,929 2,100 2,335 2,576 2,845

Moreover, the planning, development and provision of water supply is de-linked

from that of sanitation facilities, particularly sewerage and septage facilities. As a

consequence, there is a lack of septage collection and treatment system, as well

as any piped waste water collection and treatment system or a centralized

sewerage system. Due to this lack, septic tank effluent is generally allowed to

leach into the ground while untreated waste water from households and industrial

establishments is returned to the water sources.

Irrational Allocation of Water Resources

There is a mismatch between the granting and utilization of water rights vis-a-vis

needs and nature of usage. As of December 2011, the NWRB has granted water

rights to 32,759.17 entities in the province for domestic/municipal, industrial/

commercial, irrigation, recreational and other purposes.

Table 5.2-3 Allocation of Water Rights by Source and Purpose, Cavite, 2011

Source

Liters per second

Domestic/

Municipal

Commercial/

Industrial Recreation Irrigation Livestock Others Total

Spring 200.05 0.20 8.25 208.50

Surface 28,345.26 28,345.26

Deepwell 3,022.32 818.67 192.52 113.02 29.03 29.85 4,205.41

Total 3,222.37 818.87 200.77 28,458.28 29.03 29.85 32,759.17

Source: NWRB


5-5

Source: NWRB

Figure 5.2-1 Allocation of Water Rights by Source and Purpose, Cavite 2011

Surface water is used solely for irrigation while water from springs is

predominantly used for domestic/municipal purposes. Groundwater from deep

wells has the widest variety of usage ranging from domestic to industrial and

irrigation.

With the changing land use in Cavite from agricultural to industrial, there is a

possibility that some water rights are no longer used for the very purpose they

were granted. For instance, in view of the decreasing size of irrigable land areas,

water rights that have been allocated for agriculture remain largely unutilized or

underutilized. In the same breath, parties without water rights resort to illegal and

extra-legal means to supply their demand, leading to an unfavourable situation

wherein water resources are unmonitored and become unaccounted for. This

situation is best illustrated in Table 5.2-4 Irrigation Water Rights Granted vs.

Estimated Water Requirements. It is worthy to note that the original service area

of the CFLIS of 15,000 hectares has been reduced to 8,618.09 hectares

(57.4%)in 2010 due to land conversion, but the original water right allocation of

22,278lps was not adjusted. Moreover, the total irrigated areas developed by the

private systems, as of 2010, totaled 5,493 hectares. But the total water rights

granted is only 581 lps, just enough to serve about 468 hectares. It shows that

roughly 70% of the private systems‘ irrigated areas do not have actual water right

allocation.

-

5,000.00

10,000.00

15,000.00

20,000.00

25,000.00

30,000.00

Domesti

c/ M

unicipal

Comm

ercia

l/ Ind

ustria

l

Recre

ation

Irrig

ation

Livest

ock

Others

Spring

Surface

Deep well


5-6

Table 5.2-4 Irrigation Water Rights vs. Estimated Water Requirements

Hectares

Allocated

Water

Rights @

1.5 lps/ha

Firmed Up

Service Area

(Hectares)

Water Rights

Granted, lps

Estimated

Water

Requirements

(lps) @ 1.5

lps/ha

Estimated

Water

Requirements

(lps) @ 1.24

lps/ha

Remarks

National Irrigation

System 15,000 22,278 8,618.09 22,278.00 12,927 10,686

9,351 11,592 With

excess

Communal

Irrigation Systems 430.63 526.73 646 534

(119) (7) Deficit

Private Systems 5,492.86 580.90 8,239 6,811

(7,658) (6,230) No water

rights

Total 14,541.57 23,385.63 21,812 18,032

1,573 5,354 Total

excess Source: NIA - Naic, Cavite SEPP 2010

Weak Institutional Linkage and Coordination

Existing institutional and regulatory frameworks both at the national and

provincial/local levels appear to be weak and fragmented. To address the issue

of fragmentation and weak regulatory framework at the national level, two bills

have been proposed seeking to initiate a reform in the water sector and

restructuring its management and development. These are :

Senate Bill 2641, “Water Regulatory Act of 2011,” which rationalizes the economic regulation of water utilities through the creation of a Water Regulatory Commission, an independent, quasi-judicial body that has the responsibility and power to create policies for water supply, sewerage, and septic management; issue licenses; set, review, and approve rates; review and suspend contracts; and ensure that the welfare of consumers is prioritized; and

Senate Bill 2997, “Water Sector Reform Act (WSRA) of 2011” aims to institute reforms in the water industry by adopting the Integrated Water Resources Management Approach of the Global Water Partnership (GWP). The bill also opens up the industry to private investment by allowing participation in Public-Private Partnerships (PPPs) of water and sanitation services.

Funding Shortfall

There appears to be a lack of a coherent financing framework that can rationalize

financing in the water sector to make the fullest use of limited public funds and

encourage concessional financing and private sector investments. The Local

Government Code of 1991 has given more powers to the LGUs and allocated

about 20% of national revenues for block grants or transfers. Internal revenue

allotments, however, have proven to be insufficient to cover all development

requirements of most LGUs. As a consequence, LGU‘s participation in the

provision of water supply infrastructure has not expanded much. The province of

Cavite is poised to implement a private-public partnership approach after crafting

a Provincial PPP Code.


5-7

5.3 MEETING THE DEVELOPMENT CHALLENGES

To address the foregoing issues, there is a need to improve the business

environment and institute reforms in the management system. This calls for an

integrated approach which underpins the implementation of the Cavite Integrated

Water Resources Management Master Plan. CIWRMMP is focused on the

achievement of results in the targeted issues - widening demand-supply gap,

infrastructure backlog, irrational allocation of water resources, weak institutional

linkages and coordination, and funding shortfall.

Figure 5.3-1 provides a conceptual overview of the development strategy and

implementation framework for the CIWRMMP. It consists of provincial level

support, comprising of specific tasks to be performed along with activities

undertaken simultaneously by private sector development partners. The

Development Strategy is divided into three (3) formative phases, each one

consisting of specific targeted outputs, leading to the achievement of

sustainability.

Figure 5.3-1 Conceptual Overview : Development Strategy and Implementation Framework

Province of Cavite

Private Sector Development

Partner

Phase 1 Diagnostic

Stage

Phase 2 Development

Stage

Phase 3 Sustainability

Stage

• Assessment of Allocated Water Rights

• Review of Organizations and Mandates

• Mainstream CIWRMMP• Formulate Relevant

Legal Issuances and Implementing Guidelines

• Systems Design• Risk Evaluation and

Concession Agreement• Fund Syndication

• Organization of Cavite Integrated Water Management Board

• Application for Water Permit

• Concessions/Joint Venture Undertaking

• Assistance to ROW Acquisition

• Organization of Consortium Partners

• Implementation of Short-term/urgent water supply projects

• Capacity-building for Water Resource Management Organization

• Facility Management and Maintenance

• Implementation of Long-term water supply projects

• Standardization of Processes and Documentation

• Planning for Future Activities

• Planning for Future Activities

• Monitoring and Evaluation

• Continuous Improvement of Governance Processes

Development Strategy


5-8

5.4 ADDRESSING THE SUPPLY-DEMAND GAP

Figure 5.4-1 presents a map indicating areas with available water and areas which

will have difficulty of accessing water within its boundaries in the future.

The groundwater sources in the province consist of springs and wells which have

great potential to augment the existing supply for the increasing demand in the

province. There are many springs in the province, most of which, however, have

already been tapped and being utilized to supply domestic demand and recreation

and agricultural demand. The inventory of existing wells and their potential to

augment the supply to meet the future demand is discussed in detail in the chapter

on ground water assessment. Additional deep wells may still be drilled within the

specific area.

Figure 5.4-1 Groundwater Availability, 2012

Surface water resources in the province consist mostly of rivers, creeks and

rivulets that abound in many parts of the province. There are no major lakes in the

province. The major rivers that have potential to supply the demand are

Maragondon River, Panaysayan River, Balsahan River and Ilang-ilang River.

These rivers and some tributaries may also be tapped as possible source of supply

for the province.


5-9

5.5 SEWERAGE AND SANITATION DEVELOPMENT FRAMEWORK

As earlier established, there is a lack of necessary sewerage and septage systems in the Province of Cavite. Due to this lack, septic tank effluent is generally allowed to leach into the ground while untreated waste water from households and industrial establishments is returned to the water sources. It is also noted in some cases that septic tank effluents are discharged into nearby drains, ditches, or watercourses, which cause particular problems especially in coastal areas where the ground water table is relatively high Given the present situation, the Provincial Government‘s primary objective for this sector is to improve Cavite‘s sanitation and sewerage. As stated in the Water Supply, Sewerage and Sanitation Master Plan, this involves the expansion of the coverage of sanitation and sewerage services and their institutionalization. The selection and allocation of new projects for sanitation will be based on the following criteria: ―(i) Community commitment; (ii) Inadequacy of existing water supply and sanitation; (iii) Prevalence of water-related diseases; (iv) Community development level and potential; (v) Capital cost per capita; and (vi) Proportion of households served by flush toilets, water sealed latrines or sanitary latrines deemed suitable by local health authorities.” For sewerage projects, the criteria are: “(i) Presence of existing sewerage system; (ii) Existence of economically and efficiently operated and maintained water supply system; (iii) Population density; and (iv) Community commitment.” Cavite‘s Water Supply, Sewerage and Sanitation Master Plan is in keeping with Republic Act No. 9275 or the Philippine Clean Water Act of 2004, which mandates the DPWH, LGUs, and other concerned agencies to prepare a national sewerage and septage management program which also covers domestic sewage collection, treatment, and disposal. The program includes the identification of priority LGUs for sewerage, septage, and combined sewerage-septage projects; as well as the allotment of funds for the construction and rehabilitation of facilities. Other environmental laws that govern sewerage and sanitation are the following:

the Sanitation Code of the Philippines (1975); Presidential Decree No. 984 –

Pollution Control Law (1976); DAO No. 34 – Revised Water Usage and

Classification Criteria (1990); DAO no. 35 – Revised Effluent Regulations (1990);

and Republic Act No. 4850 – The Creation of the Laguna Lake Development

Authority.


6-1

CHAPTER 6 LEGAL FRAMEWORK AND INSTITUTIONAL ARRANGEMENTS

6.1 FRAMEWORKS AND PRINCIPLES

The objective of the Cavite Integrated Water Resource Management Master Plan

(CIWRMMP) is guided by the Philippine Integrated Water Resource Management

(IWRMP) Framework6 which enables the integration of the water supply sector to

the overall social and economic agenda of the Province of Cavite. In order to

decentralize water governance, management by the Local Government Units

(LGUs) will be promoted, as mandated in Republic Act No. 7160 or the Local

Government Code of 1991 (LGC). The CIWRMMP also aims to support the

Province of Cavite‘s vision of having sustainable water resources and responsive

services for present and future needs; and to map out a development strategy

that will promote the optimal and sustainable development and management of

the water resources of one of the fastest growing provinces in the country.

Around 112 billion cubic meters, roughly 70% of the country‘s total water

resources is either wasted or lost each year. Water is lost from leaking pipes and

illegal connections. In addition, rainwater just flows back into the sea instead of

being preserved for irrigation, industrial purposes, or domestic use due to lack

water catchments and other appropriate infrastructure. 7

In the province of Cavite, there is an impending deficit in water supply of 4,745

lps by year 2040 in view of the increasing demand of households, industrial

establishments, institutions, recreation facilities and agricultural production,

among others. The previous chapters discussed measures to address this

problem by tapping surface and ground water sources and storing rainwater in

reservoirs during monsoon season. However most of the rights to these water

sources have already been allocated to several entities for various purposes.

The core of the problem was the disjointed water policy.8 Around 16 major

agencies and 5,000 water service providers have some hand over the country's

water resources.9 This Integrated Water Resources Management (IWRM) plan

will hopefully help manage the water sector efficiently and effectively.10

6.2 KEY WATER-RELATED LEGISLATION11

The relevant legislations pertaining to the development of the Water Resources sector in

Cavite, including their status of implementation, are summarized in Table 6.2-1.

6 Integrated Water Management Plan Http://Www.Wepa-Db.Net/Pdf/0710philippines/4_NWRB.Pdf (Last

Accessed 06 September 2012) 7 Press Release, April 9, 2012, Http://Www.Senate.Gov.Ph/Press_Release/2012/0409_Angara1.Asp

8 Press Release, April 9, 2012, Http://Www.Senate.Gov.Ph/Press_Release/2012/0409_Angara1.Asp

9Press Release No. 3, May 3, 2012, Http://Www.Senate.Gov.Ph/Press_Release/2012/0503_Angara1.Asp

10 Press Release, April 9, 2012, Http://Www.Senate.Gov.Ph/Press_Release/2012/0409_Angara1.Asp

11 Senate Policy Brief Published August 2011 Turning The Tide: Improving Water Resource Management In

The Philippines,Http://Www.Senate.Gov.Ph/Publications/PB%202011-08%20-%20Turning%20the%20Tide.Pdf (Last Accessed 06 September 2012)

http://www.wepa-db.net/pdf/0710philippines/4_NWRB.pdf

http://www.senate.gov.ph/press_release/2012/0409_angara1.asp




http://www.senate.gov.ph/publications/PB%202011-08%20-%20Turning%20the%20Tide.pdf


6-2

Table 6.2-1 Relevant Legal Issuances

STATUTE PURPOSE/MANDATE STATUS OF IMPLEMENTATION

Commonwealth Act No. 383, Anti-

Dumping Law (1938)

Prohibits dumping of refuse, waste matter or other

substances into rivers

Not fully enforced

Republic Act No. 4850, Laguna Lake Development

Authority (LLDA) Act (1966), as amended by

Presidential

Decree No. 813 (1975)

Regulates and controls the pollution of the Laguna de

Bay Region, including sewage works and industrial

waste disposal systems

Strictly enforcing except as to domestic wastewater

Republic Act No. 6234, Metropolitan Waterworks and

Sewerage System (MWSS) Act (1971)

Constructs, operates and maintains water systems,

sewerage and sanitation facilities in the Metro Manila

area

Limited sewerage and sanitation service coverage

Presidential Decree No. 198,

Provincial Water Utilities Act (1973)

Authorizes the creation of water districts to operate

and administer water supply and wastewater disposal

systems in the provincial areas

Operation and management of wastewater disposal

system not implemented

Presidential Decree No. 281, Pasig River Development

Council Act (1973)

Regulates and controls the pollution of the Pasig River Not fully enforced

Presidential Decree No. 600, Marine Pollution Decree

(1974), as amended by Presidential Decree No. 979

(1976)

Regulates and controls the pollution of Seas Coverage is not efficiently monitored due to limited

resources

Presidential Decree No. 705, Revised Forestry Code

(1975)

Provides criteria, guidelines and methods for the

proper and accurate classification and survey of all

lands of the public domain

Not fully enforced


Sanitation Code (1975)

Requires cities and municipalities to provide an

adequate and efficient system for sewage collection,

transport and disposal in their areas of jurisdiction

Not enforced and monitored, e.g.,

connection to sewer system by houses in areas where

sewerage system is available

Presidential Decree No. 984, National Pollution

Control Decree (1976)

Provides guidelines for the control of water pollution

from industrial sources and sets penalties for

violations; requires all polluters to secure permits

Not strictly enforced; compliance on the provision of

sanitation and

sewerage are not met


6-3


Presidential Decree No. 1067, Water Code (1976) Consolidates legislation relating to ownership,

development, exploitation

and conservation of water resources

Not fully enforced

Presidential Decree No. 1096, National Building Code

(1977)

Requires connection of new buildings to a water‐borne

sewerage system

Wastewater or sewage disposal are not fully enforced

Presidential Decree No. 1151, Environmental Policy

Decree (1977)

Recognizes the right of the people to a healthy

environment

Not strictly enforced especially on sanitation and

sewerage provisions

Presidential Decree No. 152, Environment Code

(1977)

Provides guidelines to protect and improve the quality

of water resources and defines responsibilities for

surveillance and mitigation of pollution incidents

Only enforced on big polluters (i.e., industries)


Environmental Impact Statement System Decree

(1978)

Mandates the conduct of environmental impact

assessment studies for all investments undertaken by

the government and private sector

Project review is not strict on

sanitation and sewerage provisions

Republic Act No. 6716, Rainwater Harvesting Act

(1989)

Mandates the construction of water wells and

rainwater collectors in all barangays

Not enforced and monitored

Republic Act No. 7160, Local Government Code (1991) Devolves enforcement of laws on sanitation to local

government units (LGUs) and the provision of basic

services such as water supply, sanitation and flood

control

Not strictly enforced due to budgetary constraints and

low priority for sanitation and sewerage projects

Republic Act No. 7586, National Integrated Protected

Areas System

Act (1992)

Calls for the protection of outstanding, remarkable

areas and biologically important public lands,

bio‐geographic zones, and related ecosystems


lack of manpower

Republic Act No. 8041, National Water Crisis Act

(1995)

Provides urgent and effective measures to address the

nationwide water crisis relating to issues on water

supply, distribution, finance, privatization of state‐run

water facilities, the protection and conservation of

watersheds and the waste and pilferage of water,

including the serious matter of graft and corruption in

all the water agencies

Was implemented during that period and resulted in

the reorganization of the MWSS and LWUA


6-4


Republic Act No. 8371, Indigenous Peoples Rights Act

(1997)

Protects the rights of indigenous peoples to own and

participate in the planning for and management of

natural resources found within their ancestral domain


lack of manpower

Republic Act No. 9003, Ecological Solid Waste

Management Act (2000)

Provides the legal framework for a national program

that will manage the control, transfer, transport,

processing and disposal of solid waste in the country

Not strictly enforced

Republic Act No. 9147, Wildlife Resources

Conservation and

Protection Act (2001)

Mandates to conserve and protect wildlife species and

their habitats in order to promote ecological balance

and enhance biological biodiversity

Not fully enforced due to budgetary constraints and

lack of manpower

Republic Act No. 9275, Clean Water Act (2004) Provides for a comprehensive and integrated strategy

to prevent and minimize water pollution from land-

based sources

Not strictly enforced; compliance with the provision of

sanitation and sewerage facilities have not been met

Republic Act No. 9729, Climate Change Act (2009) Institutionalizes the government’s climate change

response mechanisms and harmonizes existing policies

and programs

Not yet fully carried out and

implemented due to budgetary

constraints


6-5

6.3 EXISTING ORGANIZATIONAL STRUCTURE, FUNCTIONS AND ACTIVITIES OF KEY AGENCIES

The water supply sector consists of several agencies with different regulatory

practices. The absence of a single lead agency to coordinate development in the

water sector is one of the major hurdles to the efficient implementation of

strategic water infrastructure. There are at least 30 agencies involved in the water

sector, with specific but often overlapping or conflicting mandates for water

supply, irrigation, flood management, pollution control, watershed management,

financing, policy formulation and coordination, among others. This situation

presents difficulties for effective coordination and implementation of projects and

programs to sustainably meet water use and management. (e.g., in meeting the

needs of competing users of water; linking water service provision with basic

sanitation services; and ensuring effective and efficient flood risk reduction and

management).12

The National Economic and Development Authority (NEDA), formulates policies

concerning the water and sanitation sector in its Philippine Development Plan

(PDP)13. The PDP recognizes and underscores the necessity of adopting and

institutionalizing the IWRM approach as the preferred strategy for water

resources management. Particularly, there is focus on the Bulk Water Supply

System.14 The Strategic Plan and Framework to address the issue on the equity

and access to water are as follows:

1. Practice Integrated Water Resources Management (IWRM) in the sector; 2. Rationalize financing in the water sector to fulfill Millenium Development

Goal (MDG) commitments; 3. Work towards a lead agency for the water sector; and 4. Develop capacities of NGAs, LGUs, and water-service providers (WSPs)

for the sustainable management of infrastructure and better service provision.15

In January 2006, a National IWRM Plan Framework was created to provide a

clear roadmap and a collaborative platform for all stakeholders and water-related

agencies to effectively work together to achieve water for all in a sustainable,

equitable and ecologically balanced manner. In compliance, the province of

Cavite developed its CIWRMMP to serve as roadmap in the development of

water resources in the province and basis for regulating initiatives of all

stakeholders involved.

The National Water Resources Board (NWRB)16 as the national regulating and

12

Page 134, Chapter 5 (Accelerating Infrastructure Development), Philippine Development Plan 2011-2016, Http://Www.Neda.Gov.Ph/PDP/2011-2016/Default.Asp (Last Accessed 06 September 2012) 13

Philippine Development Plan 2011-2016, Http://Www.Neda.Gov.Ph/PDP/2011-2016/Default.Asp (Last Accessed 06 September 2012) 14

Cf. Footnote 3, Page 123, Chapter 5 (Accelerating Infrastructure Development), Philippine Development Plan 2011-2016, Http://Www.Neda.Gov.Ph/PDP/2011-2016/CHAPTER%205.Pdf (Last Accessed 06 September 2012) 15

Ibid 16

Cf. PD 424 Created The National Water Resource Council (1974); PD 1206 Assigned The Resources Board Residual Functions Of The Board Of Waterworks And The Defunct Public Service Commission To

http://www.neda.gov.ph/PDP/2011-2016/default.asp


http://www.neda.gov.ph/PDP/2011-2016/CHAPTER%205.pdf


6-6

coordinating agency on water resources management and development, is

mandated to implement the Water Code of the Philippines that consolidates the

laws governing the ownership, appropriation, utilization, exploitation,

development, conservation, and protection of water resources. The NWRB

regulates and supervises water utilities outside the jurisdiction of Local Water

Utilities Administration (LWUA), MWSS-RO, SBMA-RO. In 2002, the approval of

tariffs for water districts was transferred to the NWRB from the LWUA, but due to

NWRB‘s limited personnel, LWUA continues to review and approve water

adjustments of water districts where it has financial exposure.

It should be noted that the NWRB has started to devolve and share it functions

with the LGUs,17 a few examples are:

1. Bohol Integrated Water Resources Management Board, chaired by the Governor. Some functions include:

providing LGUs measures to be adopted to safeguard, conserve and protect the environment

acceptance of application and payment of Water Permit Application (WPA), investigation and monitoring of compliance

2. Negros Island IWRM Council chaired by the Committee on Environment of the Sangguniang Panlalawigan. Some of the functions include:

policy-making

development of strategy

formulation of IWRM plan

monitoring of water resources such as flows, water quality, etc.

acceptance of water permit applications

While NWRB has the legal mandate for water governance, its existing structure

and budget limit the exercise of its functions. To address the existing leadership

gaps, the mandate of the Subcommittee on Water Resources (SCWR), initially

created under the Committee on Infrastructure (INFRACOM) to ensure the

implementation of the Philippine Water Supply Sector Roadmap, was expanded

to become the key policy coordination body for the water sector. Despite this, the

sector remains weak in terms of regulation and allocation of water resources.18

The Local Waterworks and Utilities Administration (LWUA)19is a government-

owned and controlled corporation (GOCC) with a specialized lending function

mandated by law to promote and oversee the development of water supply

systems in provincial cities and municipalities outside of Metropolitan Manila. The

law that created LWUA in the national level also provided for the establishment of

NWRB; EO 124-A, S. Of 1987 Converted NWRC To NWRB (1987); Transferred BRS To DPWH; EO 123 S. Of 2002, Reconstituted The NWRB, Transferring NWRB To DENR And Transferring Regulatory Functions Of LWUA To NWRB (2002) 17

Abano, Susan, NWRB, Devolving Functions And Sharing Power With Lgus, Managing Water Resources For Sustainability And Equity, March 11, 2009, Http://Wwf.Org.Ph/Wwf3/Downloads/Publications/Abano.Devolvingfunctionsandsharingpower.Pdf 18

Page 134, Chapter 5 (Accelerating Infrastructure Development), Philippine Development Plan 2011-2016, Http://Www.Neda.Gov.Ph/PDP/2011-2016/Default.Asp (Last Accessed 06 September 2012) 19

LWUA Was Created Through Presidential Decree No. 198, Also Known As ―The Provincial Water Utilities Act Of 1973,‖ Which Was Signed Into Law On May 25, 1973.



6-7

Water Districts in provincial cities and municipalities. In 1987, LWUA‘s mission

and area of responsibility was expanded to include provision of Level II service

(communal faucet system) through the Rural Waterworks and Sanitation

Associations (RWSAs) in areas where Level III systems (individual household

connection) were not feasible.20In 2002, the approval of tariffs for water districts

was transferred to the NWRB from the LWUA, but due to NWRB‘s limited

personnel requirements, LWUA continues to review and approve water

adjustments of water districts where it has financial exposure.

As stated, other than LWUA and the NWRB, who are at the forefront of water

resource development, there are 30 other government agencies directly and

indirectly involved in the water resource sector. Table 6.3-1 summarizes the

functions and responsibilities of these key government agencies in the water

sector.

Local Government Units (LGUs) also play a critical role in the management of

water resources in their respective areas of jurisdiction. Since LGUs are on the

frontline in the provision of services each local government should be able to

develop its own local plans, strategies and corresponding budget allotments,

consistent with national policies and targets, including those identified in the

Philippine Development Plan.

The table below summarizes the functions and responsibilities of these key

government agencies.

Table 6.3-1 Key Water Supply Sector Agencies: Delineated Roles and

Responsibilities

Agency Roles and Responsibility

LGUs Planning and implementation of water supply and sanitation programs

Preparation of water and sanitation master plans

Monitoring of local water and sanitation coverage and the update of the sector profile

Provision of support to water supply providers (WSPs) such as the RWSAs, BWSAs, and cooperatives, including funding from IRA

Based on the Local Government Code, the upholding of multiple mandates in the sector such as resource regulation, water supply provision, and economic regulation of their utilities.

LWUA Capacity building support to WSPs

Provision of technical advisory services and financial assistance to water districts

Provision of technical and institutional support to LGUs and WSPs Setting design standards for water suppliers operated by water districts and other WSPs

DILG Capacity building support to LGUs

Provision of capacity building training to LGUs

20

Http://Www.Lwua.Gov.Ph/About_Lwua_10/What_Is_Lwua.Htm


6-8

Agency Roles and Responsibility

Coordination of LGU master plan preparation

Provision of information to LGUs on available sector programs and financing

NWRB Regulation of WSPs including some (consenting) LGU-managed water utilities

Regulation of tariff

Regulation of coverage and service

Management of WSS sector database including WSP performance data

NEDA Coordination of the preparation of the national development plan and investment programs

Formulation of sector policies and strategies

Supervision of the implementation of policies, programs and projects

DPWH Provision of technical support to LGUs upon request including the implementation of Level I and Level II projects

DOF/GFIs Financial support for the water supply sector

(DOF) Supervision of the performance of GFIs like DBP, LBP and LWUA

(GFIs - DBP, LBP and LWUA) Provision of funding for the water supply sector

NAPC-WASCO Coordination of the P3W water supply projects for 432 municipalities outside of the Metro where people’s access to water supply is below 50 percent. There are 210 communities within Metro Manila and 201 municipalities in conflict zones covered by peace agreements with the RPMP/RPA/ABB (in 2000), CPLA (in 1986) and MNLF (in 1996).

DENR Based on E.O 192 (1987), the promulgation of (1) rules and regulations for the control of water, air and land pollution and (2) ambient and effluent standards for water and air quality

MWSS The overseeing of all private water utilities that are in charge of the water supply and sewerage services in Metro Manila

Fulfillment of role as the economic regulatory agency in the national capital region

6.4 AUTHORITY OF THE PROVINCIAL GOVERNMENT OF CAVITE TO FORMULATE THE CIWRMMP

The Local Government Code of 1991 (RA 7160) mandates provinces to provide

basic services and facilities such as ―inter-municipal waterworks, drainage and

sewerage, flood control, and irrigation systems; reclamation projects and similar

facilities.‖21 Hence, the province of Cavite has passed the following resolutions to

govern the development of bulk water supply in its jurisdiction:

Resolution No. 081-S-2012, authorized the Provincial Governor of Cavite to

acquire water rights for the volume of water in all rivers and tributaries within its

jurisdiction, and

Resolution No. 082-S-2012, which authorized the Provincial Governor to

formulate the Cavite Integrated Water Resource Master Plan to coordinate the

development and management of water, land and related resources, in order to

21

Section 17 (B) (3) (Vii)


6-9

maximize the resultant economic and social welfare in an equitable manner

without compromising the sustainability of vital ecosystem.

Resolution No. 045-S-2012 which approved Provincial Ordinance No. 002-S-

2012, adopting and pursuing a Public-Private Partnership (PPP) approach in

water system development.

6.5 ISSUES AND CHALLENGES

The sector‘s weak ability to respond to the water needs of the population and

problems related to sanitation, sewerage and wastewater management is due to

a fragmented institutional environment, weak regulatory framework, inadequate

support for service providers and utilities and weak access to financing and

investments.

The biggest concern that besets the provincial government is the unavailability of

water sources to tap for reservoirs since most water rights have been allocated

for various purposes. As of December 2011, the NWRB has granted water rights

to 32,759.17 entities in the province for domestic/municipal, industrial/

commercial, irrigation, recreational and other purposes (Table 6.5-1, Figures

6.5-1 & 6.5-2).

Table 6.5-1 Allocation of water rights by source and purpose, Cavite, 2011

Source

Liters per second

Domestic/

Municipal

Commercial/

Industrial Recreation Irrigation Livestock Others Total

Spring 200.05 0.20 8.25 208.50

Surface 28,345.26 28,345.26

Deepwell 3,022.32 818.67 192.52 113.02 29.03 29.85 4,205.41

Total 3,222.37 818.87 200.77 28,458.28 29.03 29.85 32,759.17

Source: NWRB

Source: NWRB

Figure 6.5-1 Allocation of water rights by source and purpose, Cavite 2011

-

5,000.00

10,000.00

15,000.00

20,000.00

25,000.00

30,000.00

Domesti

c/ M

unicipal

Comm

ercia

l/ Ind

ustria

l

Recre

ation

Irrig

ation

Livest

ock

Others

Spring

Surface

Deep well


6-10

Source: NWRB

Figure 6.5-2 Allocation of water rights by source and purpose,

Cavite 2011 (without surface water)

Surface water is used solely for irrigation while water from springs is

predominantly used for domestic/municipal purposes. Groundwater from deep

wells has the widest variety of usage ranging from domestic to industrial and

irrigation (Figure 6.5-3).

Source: NWRB

Figure 6.5-3 NWRB-granted Groundwater Rights, Cavite, December 2011

-

500.00

1,000.00

1,500.00

2,000.00

2,500.00

3,000.00

3,500.00

Domestic/ Municipal

Commercial/ Industria

l

Recreation

Irrigation

LivestockOthers

Spring

Deep well

NWR B -g ranted Ground Water R ig hts , C avite, D ec 2011

C ommerc ia l,

54.29, 1%

Industria l,

835.28, 20%

Domestic /

Munic ipa l

Dema nd,

2959.03, 71%

L ivestoc k,

26.91, 1%R ec rea tion,

192.52, 5%

Irrig a tion,

118.29, 3%


6-11

With the changing land use in Cavite from agricultural to industrial, there is a

possibility that some water rights are no longer used for the very purpose they

were granted. The question then is whether unused water rights can be revoked

and put to better use.

Article 29 of the Water Code stipulates that water permits may be revoked after

due notice and hearing on grounds of: (i) non-use; (ii) gross violation of the

conditions imposed in the permit; (iii) unauthorized sale of water; (iv) willful failure

or refusal to comply with rules and regulations or any lawful order; (v) pollution;

(vi) public nuisance; or (vii) acts detrimental to public health and safety; (viii)

when the appropriator is found to be disqualified under the law to exploit and

develop natural resources of the Philippines; (ix) when, in the case of irrigation,

the land is converted to non-agricultural purposes; and (x) other similar grounds.

Allocation of water rights, especially for domestic use, is imperative in light of the

threat of unregulated and increased well-drilling of groundwater resources. There

is a need to diversify water distribution systems and sourcing, and reduce

inefficiencies in distribution and consumption.22

Other issues are as follows:

1. Institutional Fragmentation: Planning is uncoordinated and there is a lack of monitoring due to the absence of a national government department responsible for translating government policies, strategies and goals into a comprehensive water supply program. There is not enough change in government agencies programs to specifically develop capabilities of the LGUs to perform devolved functions (e.g. establishing and operating water utilities, financing capital and O&M cost, tariff setting and regulations). Further, existing Water and Sanitation (WATSAN) masterplan is either outdated, or worse, nonexistent. Finally, there is a lack of reliable data or absence of systematic and regular monitoring activities (in all levels) and little coordination in planning for both urban and rural areas per municipality.

2. Inadequate Support to Rural Water Supplies: Support in terms of technical design criteria, project financing, management, operation and maintenance. The LGU Planning Unit as a whole provides planning for both the urban and rural areas, unless a private corporation is involved. Lack of comprehensive programs to guide the development of rural water supply is due to limited capacity and mandate (e.g. LWUA, DILG-WSSPMO) to provide support services to Water Sanitation Programs.

3. Low Tariff and Cost-Recovery Level: Water utilities are not able to sustain operation and expand coverage. Water tariff structures and setting methodologies differ across individual service providers. Implemented tariffs are not enough for the majority of the WSPs to recover recurrent cost and accumulated sufficient reserves to fund new capital development. The lack of detailed guidelines, guidance and assistance in tariff setting and problems

22

United Nations Economic And Social Commission For Asia And The Pacific, Pro-Poor Water And Wastewater Management In Small Towns, Integrated Water Management In Baguio City, Philippines


6-12

with collection efficiency as well as political will to set and implement appropriate tariff levels.

4. Weak and Fragmented Regulatory Framework: Lack of transparency regarding performance and benchmarking information for individual providers make it difficult to hold service providers accountable for service improvement as well as effective implementation of regulation. There is a need to make water service providers accountable to consumers with expanded access, efficient use of revenues and improved service quality.

5. Low Performance of Water Utilities: Water service providers do not perform satisfactorily. Slow service expansion and low coverage, high Non-Revenue Water (NRW) levels, and requirements for subsidies by the majority of service providers. Both RWSAs and BWSAs and cooperatives suffer from lack of technical and managerial capacity, unable to retain skilled staff and absorb the technical assistance given. Moreover, even utilities of LGUs lack technical, financial and management capabilities, and autonomy with regard to political interference in management decisions.

6. Investment and Financing: Low public and private sector investment in the water supply sector, which resulted into, limited access to financing for service expansion of small utilities.

7. Lack of WSS Sector Information: There is a need to continuously update the existing provincial water supply and sanitation master plan. This is to ensure continuous updating of the existing information base and to make sure that there is sufficient reliable data and systematic and regular monitoring sector activities in the municipalities by the Local Government Units.

8. Improper and Inadequate Utilization of Water Rights : In line with the need to continuously keep abreast of developments in the sector, there is a need to bring the allocation of water rights up to date with current realities. For instance, in view of the decreasing size of irrigable land areas, water rights that have been allocated for agriculture remain largely unutilized or underutilized. In the same breath, parties without water rights resort to illegal and extralegal means to supply their demand, leading to an unfavourable situation wherein water resources are unmonitored and become unaccounted for. This situation is best illustrated in Table 6.5-2 - Irrigation Water Rights Granted vs. Estimated Water Requirements. It is worthy of note that the original service area of the Cavite Friar Land Irrigation System (CFLIS) of 15,000 hectares has been reduced to 8,618.09 hectares (57.4%) in 2010 due to land conversion, but the original water right allocation of 22,278 lps was not adjusted. Moreover, the total irrigated areas developed by the private systems, as of 2010, totaled 5,493 hectares. However, the total water rights granted is only 581 lps, only enough to serve about 468 hectares. It shows that roughly 70% of the private systems irrigated area do not have actual water right allocation.


6-13

Table 6.5-2 Irrigation Water Rights Granted vs. Estimated Water Requirements Province of Cavite

Hectares

Allocated

Water

Rights @

1.5 lps/ha

Firmed Up

Service Area

(Hectares)

Water Rights

Granted, lps

Estimated

Water

Requirements

(lps) @ 1.5

lps/ha

Estimated

Water

Requirements

(lps) @ 1.24

lps/ha

Remarks

National Irrigation

System 15,000 22,278 8,618.09 22,278.00 12,927 10,686

9,351 11,592 With

excess

Communal

Irrigation Systems 430.63 526.73 646 534

(119) (7) Deficit

Private Systems 5,492.86 580.90 8,239 6,811

(7,658) (6,230) No water

rights

Total 14,541.57 23,385.63 21,812 18,032

1,573 5,354 Total

excess Source: NIA - Naic, Cavite SEPP 2010

About 734 MLD of surface water can be generated from excess of NIA and illegal

water rights used by the private sector.

The province of Cavite also acknowledged the highly sectoral orientation in its

institutional response to water governance. Inter-agency collaboration is limited

by the agencies‘ mandates (e.g., water quality testing, technical assistance in

water infrastructure development, etc.). There is no single agency that

coordinates local water policy-making, planning and actions. However, with the

creation of the Cavite Integrated Water Management Plan, management of water

resources and services would hopefully improve.

6.6 LEGAL FEASIBILITY OF THE PROPOSED SOURCES OF WATER FOR THE INTERGRATED WATER RESOURCE MANAGEMENT PLAN

6.6.1 Aggregation of Water Rights

There is a disconnection between water rights applied for and granted within the

Province of Cavite with actual demand. This is mainly to the lack of an integrated

water management plan to guide the coordination of the water resource

allocation.

The Water Code provides several ways to do this by application for water rights,23

individual revocation, (mass application for terminated water rights)24, mass

revocation/modification for a project of greater beneficial use,25 transfer of

rights26.

23

Articles 2 and 7 of the Water Code 24

Articles 20 and 89 of the Water Code 25

Article 89 of the Water Code 26

Article 19 of the Water Code


6-14

6.7 RECOMMENDED INSTITUTIONAL ARRANGEMENT

The provincial government has since then taken some steps to address the

issues on regulation and financing of water utilities. The Cavite Integrated Water

Resource Management Master Plan emphasizes the urgency of taking on the

following challenges:

1. Improving the institutional environment through strengthening of economic

and resource regulation, integrated sector planning and strengthening of the

institutional support systems of sector agencies;

2. Developing the capacity of sector agencies through a national agency

program shift towards support for LGUs and WSPs, sustaining capacity

development programs and appropriate technologies;

3. Building alliances among development champions in the executive and

legislative branches of government, public and private sector institutions and

between agencies and civil society organizations; and

4. There may also be a need for the government of the Province of Cavite to

enter into a Memorandum of Understanding with the NWRB, so that certain

regulatory and monitoring functions can be devolved to the Provincial

Government, similar to the Bohol Integrated Water Management Board.

6.7.1 Creation of a Cavite Water Resources Management Committee (CWRMC)27

Similar to the issues at the national level, the uncontrolled use of groundwater is

partly due to the absence of an integrated local water regulatory framework.

There is no agency or office that gathers, synthesizes and analyzes data on

water extraction in relation to issuance of permits for well drilling and water

sourcing.28A local mechanism to share responsibilities with NWRB is needed.

The NWRB, with its current constraints in terms of financial and human

resources, recognized the need to collaborate and partner with different agencies

in order to effectively manage the water resources of the country.

Under Article 80 of the Water Code of the Philippines, the Board may deputize

any official or agency of the government to perform any of its specific functions or

activities. Since NWRB does not have regional offices, deputized agencies were

created through a Memorandum of Understanding between NWRB and agencies

such as NIA, DPWH, NPC and WDs to perform some of its functions. The

NWRB has implemented LGU deputation in Bohol to strengthen its presence in

27

Abano, Susan, NWRB, Devolving Functions And Sharing Power With Lgus, Managing Water Resources For Sustainability And Equity, March 11, 2009, http://wwf.org.ph/wwf3/downloads/publications/abano.devolvingfunctionsandsharingpower.pdf 28

United Nations Economic And Social Commission For Asia And The Pacific, Pro-Poor Water And Wastewater Management In Small Towns, Integrated Water Management In Baguio City

http://wwf.org.ph/Wwf3/Downloads/Publications/Abano.Devolvingfunctionsandsharingpower.Pdf


6-15

the area. A similar model may be followed by the Province of Cavite while

retaining the ultimate regulatory functions with the NWRB.

The CWRMC will be a permanent inter-agency committee which shall ensure that

the CIWRMP of the Province of Cavite will be implemented properly, with specific

focus on ensuring the rational allocation of water rights based on the CIWRMP.

The main function of the CWRMC is to clear all water rights applications within

the Province of Cavite for compliance and consistency with the CIWRMP. The

Clearance from the WRCH shall be a prerequisite before the NWRB gives due

course to an application for water rights within the Province of Cavite and

subsequently approve the application if meritorious.

The Clearance from the CWRMC will be indispensable in the water rights

application process, without which the NWRB will not grant rights. However,

clearance from the CWRMC will not be definitive and the NWRB may deny water

rights applications already cleared by the WRCMC, if it finds convincing proof of

the absolute lack of merit of the application.

In addition, the CWRMC shall monitor continued compliance of water rights

holders with the CIWRMP, and shall initiate actions for the nullification of non-

compliant parties before the NWRB. Deputized agents have the following

responsibilities:29

1. Accept, process, investigate and submit reports to the NWRB for its proper

action with recommendations on water permit application;

2. Investigate and submit reports to the NWRB for its proper action with

recommendations on water use controversies referred by NWRB within the

respective territorial jurisdiction;

3. Conduct continuing inventory of different users of water and other water

resources development activities in their respective jurisdiction in

conformance with the provisions of the Water Code and submit its findings to

the to the NWRB for its proper action;

4. Conduct monitoring of well drilling activities in respective jurisdictional area

and submit reports to the NWRB for its proper action;

5. Monitor and validate compliance by water permittees with the conditions

imposed in the water permits and submit reports to the NWRB for its proper

action;

6. Notify NWRB of violations by water appropriators and illegal drilling activities

for the issuance of Notice of Violation (NOV) and Cease and Desist Orders

(CDOs);

29

Abano, Susan, NWRB, Devolving Functions And Sharing Power With Lgus, Managing Water Resources For Sustainability And Equity, March 11, 2009, http://wwf.org.ph/wwf3/downloads/publications/abano.devolvingfunctionsandsharingpower.pdf

http://wwf.org.ph/Wwf3/Downloads/Publications/Abano.Devolvingfunctionsandsharingpower.Pdf


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7. Conduct water resources assessment and other related studies with the

assistance of NWRB;

8. Undertake information, education and communication campaigns to key

stakeholders regarding the Water Code of the Philippines and its

Implementing Rules and Regulations;

A Memorandum of Agreement (MOA) should be entered into between the

Province of Cavite and the NWRB for the establishment of the WRCMC and to

set forth its powers and functions in relation to the NWRB. The MOA will be in

accordance with the devolution of functions of the NWRB pursuant to Section 17

of the Local Government Code.

The CWRMC will better serve the purposes of the Province of Cavite since it

wishes to enter into a Joint Venture ("JV") Agreement with a private entity for

purposes of the Bulk Water Supply Project. The conflict of interest on the part of

the province that may arise from controlling both the regulatory and operational

body will be avoided.

6.7.2 Entering into Public-Private Partnerships

Nonetheless, implementation of the Cavite Integrated Water Management Plan must be done with the private sector which can provide financial resources, technology, technical expertise and operating competence. The PPP model also mitigates the fiscal and resource limitations of the Province, thus allowing the allocation of LGU resources for other priority needs.30

Further, the PPP model provides flexibility in management of LGU assets, market-based charges for greater service sustainability, professionalization of personnel and organizational structures, profit motivation impetus to ensure efficiency and effectiveness in service delivery, and protection of projects from possible adverse political interferences in service delivery.31

According to the PPP Code of the Province of Cavite, there are 16 PPP

Modalities available to it:

1. Build-and-Transfer (BT); 2. Build-Lease-and-Transfer (BLT); 3. Build-Operate-and-Transfer (BOT); 4. Build-Own-and-Operate (BOO); 5. Build-Transfer-and-Operate (BTO); 6. Contract-Add-and-Operate (CAO); 7. Develop-Operate-and-Transfer (DOT); 8. Rehabilitate-Operate-and-Transfer (ROT); 9. Rehabilitate-Own-and-Operate (ROO); 10. Concession Arrangement; 11. Joint Venture (JV); 12. Lease or Affermage; 13. Management Contract;

30

Page 16, Volume 1 of the PPP Manual for LGUs 31

ibid.


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14. Service Contract; 15. Divestment or Disposition; and 16. Corporatization.

While these options are available to the Province of Cavite, there are certain

approval requirements which must be taken into consideration (Table 6.7-1).

Table 6.7-1 Levels of Approval of LGU Project

Levels Description

President

• All Build-Operate-Own projects and other schemes not defined in Section 2 of RA 7718, subject to the recommendation of the NEDA Board’s Investment Coordination Committee

Investment Coordination Committee (ICC)

• Local projects costing above Php200 million

• All unsolicited proposals under the BOT Law regardless of project cost

Regional Development Council (RDC)

• Local projects costing above Php50 million up to PhP200 million

City Development Council (CDC)

• Local projects costing up to Php50 million

Provincial Development Council (PDC)

• Local projects costing above Php20 million up to Php50 million

Municipal Development Council (MDC)

• Local projects costing up to Php20 million

Source: Section 2.7 of the RA 7718

Further, the relevant local office and committees for PPP are:

Table 6.7-2 Relevant Local Offices and Committees for PPP32

LGU Office/Committee

Lead Officer Responsibilities

Office of the Local Chief Executive

Governor or Mayor

Oversee the preparation of the local development plans, prioritization of projects, including those for PPP implementation; and shepherding the process of project development to approval, procurement, implementation and monitoring and evaluation.

Provincial, City and Municipal Planning and Development Office

Planning and Development Coordinator

Formulate integrated economic, social, physical and other development plans and policies for consideration of the LDC;

Provincial, City and Municipal Engineering Office

Engineer Initiate, review and recommend changes in policies and objectives, plans and programs, techniques, procedures and practices in

32

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LGU Office/Committee

Lead Officer Responsibilities

infrastructure development and public works of the local government unit concerned

Provide engineering services to the local government unit concerned, including investigation and survey, engineering designs, feasibility studies and project management

Provincial, City and Municipal Local Economic and Investment Promotion Office

Local Economic and Investment Promotion Officer (LEIPO)

Prepare, coordinate and execute local economic and investment promotion policies, projects and activities at the provincial, city and municipal

levelHead the PPP Sub-Committee as per DILG MC No. 2010-113.

Provincial, City and Municipal PPP Sub- Committee

Local Economic and Investment Promotion Officer

Assist in the formulation of action plans and strategies related to the implementation of PPP

programs and projectsThe PPP Sub-Committee is headed by the LEIPO in Provinces and Cities. In Municipalities, however, the Local Chief Executive designates a staff under the Office of the Mayor to head the Sub-Committee

Provincial, City and Municipal Pre-qualification, Bids and Awards Committee

The Chairperson should be at least a third ranking regular official of the LGU

Responsible for all aspects of the pre-bidding and bidding process of solicited proposals and comparative bidding process of unsolicited proposals

Provincial, City and Municipal Development Council

Planning and Development Coordinator

Appraise and prioritize socioeconomic

development programs and projectsCoordinate, monitor, and evaluate the implementation of development programs and projects

Endorse to the Sanggunian a PPP project that has passed the review and appraisal process

Provincial, City and Municipal Sanggunian

SanggunianConvenor Issue a resolution approving PPP projects and contracts

6.7.3 Legislative Agenda for the Province of Cavite

The Province of Cavite may enact Resolutions for the following purposes in order to implement the CIWRMMP:

Selective Revocation of Existing Water Permits

The selective revocation of existing water permits, which are held by several water supply operators, is necessary for the integration of water resources under the CIWRMMP. At its core, the revocation of these water permits is analogous to a right-of-way taking, which may be done through any of the following ways or a combination of: negotiation with individual water rights holders for the transfer of water rights, individual revocation or a mass revocation in favor of a project for greater beneficial use.


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Revocation of water permits may be achieved either by: (a) individually revoking water permits of each water supply operators; or (b) mass revocation of water permits pursuant to the Water Code (PD 1067).

The individual revocation of permits may be ordered by the NWRB, after notice and hearing, upon the grounds enumerated in the Water Code or its IRR such as non-use, water wastage or violations against the code.

In the case of mass on the other hand, NWRB may terminate the water permits in favor of the Province of Cavite on the ground that it shall, under the CIWRMMP, undertake a project for greater beneficial use or for multi-purpose development. The Resolution shall, in this case, provide for just compensation of the holder which shall suffer the revocation. The compensation may be front-loaded by the PPP partner and later deducted from the revenue stream of the Province.

Either modes of revocation will entail risks. In the case of individual revocation, the process will involve a lengthier procedure since after each individual revocation, the Province of Cavite, and/or the PPP partner will still have to apply for the water permits. It shall be considered a new application, with the usual requirements and procedures. On the other hand, while mass revocation may be ordered summarily, considering the number of parties involved, it may become a complicated process with several parties opposing the initiative. Ensuring that only those water rights that are partially utilized will be terminated, where practicable, may soften the opposition to the mass revocation procedure. Further it must also be ensured that qualified revocation of irrigation water rights permits, to the extent that these are unutilized, are given special attention considering the strong community opposition this may entail. Note further that mass revocation is in the nature of an eminent domain taking which entails compensation. Hence, there must be a clear benchmarking of the value of an unutilized water rights permit. Partnering with Existing Water Rights Holders/Transfer of Water Rights

The Province of Cavite, instead of seeking the revocation of said water rights, may also opt to directly negotiate the transfer of the water rights, as well as the operation and management of the water supply system, from existing holders/water districts. The transfers shall be in consideration for an allocation in the revenue share of the province. Authority to Negotiate/ Enter into Memoranda of Agreement

In order to facilitate transactions necessary for the integration of water resources under the CIWRMMP, it would be beneficial to designate an authorized representative, particularly the Governor of the Province of Cavite, to negotiate with private entities for the following purpose: (1) negotiation with water districts for the terms of the transfer of their existing water rights; (2) establishing a PPP Sub-Committee in the Local Development Council to assist in the development of strategies and plans for PPP;33 (3) negotiation with private entities for the

33

DILG MC No. 2011-16, in particular, recognizes the need to facilitate the ―localization of the mandated

powers and functions of the PPP Center‖ and, thus, enjoins all Local Chief Executives to establish a PPP

Sub-Committee in the Local Development Council that would, among others, ―assist the Local Development


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possibility of entering into a PPP to implement the CIWRMMP and integrate the water resources of the Province of Cavite; (4) Authority to enter into Memoranda of Agreement with various government agencies to establish the CWRMC; (5) authority to represent the Province in its negotiation with the NWRB to allow the mass revocation of unutilized water rights and transfer these to the Province of Cavite; and (6) negotiation and execution of all other transactions pursuant to, and in furtherance of, the CIWRMMP.

Establishment of a Water Rights Clearing House and Management

Committee

In order to effectively implement the CIWRMMP, the Province of Cavite may

establish a Water Resource Management Committee (CWRMC), for the purpose

of rationalizing the use and development of water resources in the province. The

functions of the WRCH will include, among others: (1) confirming and examining

the compatibility of existing water rights with the CIWRMMP; and (2) ensuring

that all water rights heretofore granted shall be in conformity with the CIWRMMP.

As discussed above, Memoranda of Understanding must be entered into by the

Province of Cavite to establish this permanent inter-agency committee.

Review of State of Groundwater Extraction

As part of the review and monitoring function of the CWRMC, the state of

groundwater supply-demand situation in the entire province should be reviewed

and the declaration of identified municipalities as ―critical areas‖ should be

undertaken to mitigate the adverse effect of over-extraction.

Council (LDC) in the formulation of action plans and strategies related to the implementation of PPP

programs and projects.‖ (page 9, Volume 1 PPP Manual for LGUs)


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CHAPTER 7 POLICIES, STRATEGIES AND PROGRAMS AND PROJECTS

7.1 POLICIES

The Provincial Government of Cavite shall be guided by the following policies for

the integrated development and management of its water resources:

Provide the whole population of Cavite Province access to safe and potable

water and basic sanitation

Optimize the use of available water through a more rationalized allocation of

resources and water rights based on need and usage

Improve health outcomes and effect a sustainable environment through

improved sanitation, septage, and sewerage systems provision particularly in

highly urbanized and/or densely populated areas

Encourage private sector participation in the financing, implementation and/or

operation of water resources development and management projects and other

related undertakings of the Cavite Provincial Government

7.2 STRATEGIES

To achieve the policies defined and established above, the following strategies shall be carried out:

Development of new water supply sources based on a viable provincial land

use plan, to include as well importation of water from nearby provinces, to

meet increasing demand that are sustainable, stable, reasonable and which will

provide equitable and affordable water supply for all end users

Enable the participation of concerned service providers in plan development, programming and operations, among others, in order to improve coverage, efficiency and sustainability of related infrastructure

Enactment of legislation/ordinance to introduce financing innovation for the implementation of sewerage and septage system projects, that will link these services to revenue-generating water service provision in order to facilitate investment cost recovery.

Establishment of an effective and clear monitoring system to assess and address the sustainability of developed related infrastructure

Imposition of an environmental user‘s fee, particularly on those without water rights, and which shall be based on the cost of replenishment and rehabilitation of the affected water bodies.

Introduction and/or enactment of appropriate legal instrument to address institutional and regulatory issues relating to the integrated management and development of the province‘s water resources.


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Stimulation of growth in rural areas to curb rural-urban migration that has led to increasing pressures in ecosystems and water bodies as well as unsustainable land use practices in urban areas.

Promotion of environmental education, particularly in water resource management, to enable people to appreciate and understand the complexity of environment and their roles and responsibilities in sustainable water resource management.

Resource regulation shall be strengthened to ensure that surface and ground water supply sources are sustainably developed, managed and utilized.

7.3 PROGRAMS AND PROJECTS

In support of the established policies and strategies of the Cavite Provincial

Government for an integrated management and development of the province‘s

water resources, the following programs and projects are envisioned to be

implemented within the short, medium and long term development horizons:


(P Billion)

Short Term Development Works (1-3 years)

Surface water development Abstraction from river sources and provision of treatment plant and transmission facilities as well as other necessary facilities

5.0

Groundwater Development and Management

Abstraction of water through deep wells and springs and provision of pump stations, pipelines and other support facilities.

6.5



1.0



0.003/year



0.006/year


0.007/year

Metering Provision of production meters, supply meters and consumer meters

(Included in system

development costs)


0.006/year

Sewerage and Septage

Provision of sewerage and septage collection and treatment facilities

6.0


7-3


(P Billion)

Medium Term Development Works (3-6 years)

Surface water development and Expansion


7.0



4.0

Rainwater/storm water harvesting and reuse

Provision of technology and designs for domestic households. Construction of impoundment reservoirs to augment supply

4.0



0.003/year



0.006/year


0.007/year


0.006/year

Long Term Development Works (6-10 years)

Surface water development and expansion


28.0

Managed aquifer storage, recharge areas, water balance

Reforestation. Protection of watershed areas. Declaration of areas as protected areas

1.0

Reduction of water pollution Management solid waste through construction of MRF, and disposal facilities. Continuing education campaign and segregation.

2.0

Water distribution system development


2.0



0.003/year



0.006/year


0.007/year


0.006/year

Cavite Integrated Water Resource Master Plan

Documents

Transcript of Cavite Integrated Water Resource Master Plan