Hydraulic Modeling of the Guam Water System

Colin Ricks

May 1, 2015

Guam

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Tok

yo: 1

,60

0 m

ile

s

Guam

Guam

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Tok

yo: 1

,60

0 m

ile

s

Guam

Guam

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Guam

2010 Population: 160,000

Tropical Climate

• Average rainfall: 92 inches/year

• Average temp: 82ºF

Principal Industries:

• Tourism

• US Military

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Guam History

~2000 BC – Chamarros arrived

1521 – Ferdinand Magellan

1668 – Spanish colonization

1898 – Surrendered to US

1941 – Captured by the Japanese

1950 – US Territory

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Serves civilian population • ~55,000 customers

Water System • 600 miles of pipe

• 29 Tanks, ~29 MG

• 26 Booster Pump Stations

Supply • 38 MGD (avg 2014)

• 120 wells in North

• Surface water in South

• Connections to US Navy water system

Guam Waterworks Authority (GWA)

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GWA Challenges

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Leaks

GWA Challenges

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Leaks

Partially-Closed Valves

GWA Challenges

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Leaks

Partially-Closed Valves

Maintenance

GWA Challenges

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Leaks

Partially-Closed Valves

Maintenance

Record Keeping

First model built in 2006

Innovyze’s H2OMAP Water

Water Distribution Model

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Started GIS from Model Piping

GIS

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GIS

Started GIS from Model Piping

GIS Updates

• As-Builts

• Field Work

• Leak Detection

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Updated Model

• 2012 - Model converted to InfoWater

• Runs in ArcGIS

• Piping from latest GIS

• Ongoing updates to GIS

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Model / GIS Linking

Add New Piping

• Only maintain one database

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Fix Piping Alignments

Model / GIS Linking

Model Development

• Standardize and document how model will be built and updated

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• GPS Customer Water Meters

Demands

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Diurnal Pattern

Demands

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0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0 6 12 18 24

Pe

ak

ing F

acto

r

Hour

Demands

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Fire Flow Tests

Hydraulic Calibration

• Check Hydraulics, C Factors, Closed Valves

Calibration / Field Work

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Calibration / Field Work

Pressure Loggers

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Calibration / Field Work

PRV Location and Setting

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Calibration / Field Work

• Verified pump curves

• Pump Tests

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Tanks

Operational Calibration

Pumps

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30

35

40

45

0 24 48

Le

ve

l (f

t)

Hour

Model Results

Field Data

Top of Tank

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

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Flo

w (

gp

m)

Hour

Model Results

Field Data

Operational Calibration – No SCADA

Tank Levels

Flow Meters

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0

5

10

15

20

25

30

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0 24 48 72 96 120 144 168 192

Le

vel (f

t)

Hour

Field Data

Top of Tank

Evaluation

• Storage

• Pressure

• Velocity

• Fire Flow

• Supply

Model Analysis / Uses

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Hydraulic Schematic

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Model Analysis

• Storage - Long Term Plan

• Fire Flow

• Supply

• Realignment of Pressure Zones

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Pressure Zone Realignment

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Next Steps

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• Refine zone realignment plan

• Update model with new GIS

• Identify areas for further field investigation and testing

• Continue improving calibration

Lessons Learned

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• Have a good plan for updating model

• Document processes and sources

• Every system is unique

Questions?

33