Joint_WS_Model_Presentation_MWL n WSL

of 19 /19
From 1900mm to 50mm A case study of the calibration of an "all pipes" joint water supply model for Manukau Water and Watercare Presenter: Priscilla Chung - Manukau Water Limited Co-author: Sharon Danks – Watercare Services Limited Watercare Services Limited GHD Limited Manukau Water Limited

Transcript of Joint_WS_Model_Presentation_MWL n WSL

Page 1: Joint_WS_Model_Presentation_MWL n WSL

From 1900mm to 50mm A case study of the calibration of an

"all pipes" joint water supply model for

Manukau Water and Watercare

Presenter: Priscilla Chung - Manukau Water Limited

Co-author: Sharon Danks – Watercare Services Limited

Watercare Services Limited GHD Limited Manukau Water Limited

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Introduction

PART 1 – Presented by Priscilla Chung (Manukau Water)

• Background and key drivers

• Project Scope

• Field data collection

• Better understanding of the networks

PART 2 – Presented by Tim Preston (GHD)

• Lessons learnt in calibrating the combined model

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Background

Bulk Water Supplier for

the Auckland Region

347,000m3/day

Local Network Operator

for Manukau City

80,000m3/day

Modelling Consultant

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Key Drivers

HUNUA NO. 4 TRUNK WATERMAIN

GROWTH

SECURITY OF

SUPPLY

IMPROVED

PERFORMANCE

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GrowthINT

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0.0

10.0

20.0

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40.0

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60.0

70.0

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2000 2010 2020 2030 2040 2050 2060 2070

Year

Total Manukau Urban Connected Population (thousands) Water Demand ( million m3 per year)

Assumptions:

•1% increase in demand from top 30 high consumption customers

•12.5% drop in other demands

Significant demand growth planned

for the Auckland airport extensions

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Hunua No. 4 Trunk Watermain and

Security of Supply

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Manurewa Trunk Watermain

Hunua No. 2 & 3

Trunk Watermains

Critical BSPs

Proposed Hunua No. 4

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Improved Local Network Performance

BASE MODEL – TO BE REFINED

FOR SPECIFIC PLANNING

AND OPERATIONAL NEEDS

PRESSURE

REDUCTION

DISTRICT

METERING &

ISOLATION

SUPPLY OF

FIRE FIGHTING

WATER

OPTIMISATION OF

NETWORK

OPERATION

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Project Approach

JOINT PLANNING

MANUKAU WATER - WATERCARE

JOINT PROJECT

MANAGEMENT

ACHIEVE

COMMON

OBJECTIVES

REMOVE THE

BOUNDARY OF

ASSET OWNERSHIP

COST SHARING

SET TIMEFRAME

TO MEET HUNUA

NO. 4 DESIGN

PROGRAMME

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KNOWLEDGE

SHARING

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• All assets model

• 52,344 water pipes

• 48,095 junctions

• One field monitoring programme

• pressure logging and flow testing at 117 fire hydrants

• flow and pressure logging at 25 bulk supply points, 43 district meters

• flow logging at 29 large water consumers

• GPS level survey at 189 pressure monitoring points

• SCADA data extraction from both organisations

• Unique model calibration approach

• 2008, 2028, 2063 design horizons

• Network analysis and options to be considered as a single entity

Hydraulic modelling of a combined systemINT

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Jan – March 2008 Project Planning & Tendering

May – July 2008 Field Data Collection

June - Aug 2008 Model Development

Aug 2008 – April 2009 Model Calibration & Verification

May – June 2009 System Performance Analysis

July – August 2009 Master Planning

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Field Data Collection Challenges

Most contractors have limited number of

temporary loggers available

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Each pressure

logger serves

approximately 4000

properties

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Field Data Collection Challenges

Study area was divided into four sub-areas with

a rolling programme of field data collection

Boundaries were continuously monitored

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Field Data Collection Challenges

Auckland experienced conditions approaching a

drought during the 2008 summer

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CONVENE TECHNICAL OPERATIONS

GROUP

(AUCKLAND WATER INCIDENT

COORDINATION PLAN)

65.2% ACTUAL

STORAGE (30 Jun)

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10% SAVINGS BAND 20% SAVINGS BAND 30% SAVINGS BAND 40% SAVINGS BAND

55.9%

ACTUAL

STORAGE

(31 March)

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Field Data Collection Challenges

Public perception of wasting water during

drought?

Discharge of chlorinated water into stormwater

system?

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Reduced fire hydrant

flushing duration from

15 minutes to 5 minutes.

Taking 3 pressure

measurements at one

minute intervals.

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Field Data Collection Challenges

Potential dirty water incidents caused by the

flushing of network pipes during fire hydrant

flow tests

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Photo provided by Citycare

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Field Data Collection Challenges

Flyer drop to residential customers 3 – 5 days

before the commencement of field tests for each

of the four sub-areas

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Field Data Collection Challenges

Manukau Water

Communication

Programme

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Project Team

- Manukau Water

- Watercare

- GHD (Consultant)

- AWT (Field test contractor)

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Better understanding of the system

• Hundreds of data discrepancies

• PRV settings and flow modulation

• Faulty wiring or multiplier at inter-district flow meters

• Modelling error at Mill Road Reservoir in Watercare’s

bulk supply model

• A complete picture of flow regime city-wide

• Improved assessment of critical area

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PART 2 – Presented by Tim Preston (GHD)

• Lessons learnt in calibrating the combined model