wnz 09 demand management_priscilla chung

Water New Zealand Annual

Conference 23-25 September 2009 Water Demand Management –

Manukau Water Limited Case Study

Presenter: Priscilla Chung

Planning Engineer

Manukau Water Limited

Manukau Water

• Water and

wastewater services

retailer

• Supply water to

urban area in

Manukau City

• 347,000 people

• $ 1 billion water

and wastewater

assets

•101k Metered

connections

Presentation Outline

•Demand Management Model

•Targets & 1st year performance

•Implementation

•Water demand trends

Demand Management Wheel

Manukau Water

Demand

Management

Customer

Satisfaction

Efficiency &

Effectiveness

Transparency & Accountability

Environmentally

responsible

Strategic Map




•Implementation


•Bulk water demand within the 1st tier of bulk supply contracted price incentive rate

•Non-revenue water maintained at 10.6% of bulk water purchased or reduced over time

•Meet the Auckland regional target of 4.5% reduction in gross per capita demand from 2004 to 2024, set out in “From the Sky to the Sea” document.

Demand Management Targets

Bulk Water Demand Target

10.6% target

10.3% in 2009

Reduced from

12% to 10.6% in

2004/05 through

active leak

detection in

Papatoetoe and

Mangere

Remained

static from

2006 to 2008

since formation

of CCO

Auckland Region (excluding

Manukau Water) 13.6%

Regional target of 4.5% reduction from 2004 to 2024

Actual

achievement

was 270 litre/

day/ capita in

2009

298 litre/ day/ capita

in 2004

284 litre/ day/

capita by 2024




•Implementation


Hydrant Policy

Standard

standpipe

for metered

operational

use

Leak alarm in SCADA system

– detect pipe bursts in water supply districts

Water Supply

District

District

Meters

Night Flow

Alarm

Setting

Actual

Night Flow

Private plumbing leak detection in customer

billing system

Leak notification to Housing New Zealand

Corporation

Web based consumption monitoring tool

for highest water users

Can

download

raw data

Graphing water

consumption data at 5

minute intervals

Daily

consumption

scale

Support multiple

meters per

customer

Water consumption display unit

Expanding city-wide water mass balance

analysis to water supply districts

Water Mass Balance

per Water Supply

District

Leak

detection

Flow regime

analysis

System

operation

optimisation

Non revenue water

managementDemand

Management

Water Mass Balance

per Water Supply

District

Bulk supply

points – flow

and pressure

Inter-district

boundary

- flow and pressure

Customer

meters - flow

Complete

district

metering

Review meter

reading programme

Automated telemetry

data extraction and

decision making

support system

Expanding city-wide water mass balance

analysis to water supply districts




•Implementation


Conclusions

• Success in first year implementation of Demand

Management Strategy

• Successful measures implemented to date are

• customer communications;

• key accounts management; and

• private plumbing leak detection programme

through checking water bills and customer

notification.

• The concept of promoting “cost effective water

services” is well received by customers

wnz 09 demand management_priscilla chung

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