Download - WNZ 09 Demand Management_Priscilla Chung
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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
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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
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Presentation Outline
•Demand Management Model
•Targets & 1st year performance
•Implementation
•Water demand trends
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Demand Management Wheel
Manukau Water
Demand
Management
Customer
Satisfaction
Efficiency &
Effectiveness
Transparency & Accountability
Environmentally
responsible
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Strategic Map
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Presentation Outline
•Demand Management Model
•Targets & 1st year performance
•Implementation
•Water demand trends
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•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
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Bulk Water Demand Target
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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%
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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
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Presentation Outline
•Demand Management Model
•Targets & 1st year performance
•Implementation
•Water demand trends
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Hydrant Policy
Standard
standpipe
for metered
operational
use
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Leak alarm in SCADA system
– detect pipe bursts in water supply districts
Water Supply
District
District
Meters
Night Flow
Alarm
Setting
Actual
Night Flow
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Private plumbing leak detection in customer
billing system
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Leak notification to Housing New Zealand
Corporation
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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
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Water consumption display unit
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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
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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
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Presentation Outline
•Demand Management Model
•Targets & 1st year performance
•Implementation
•Water demand trends
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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