demand management customer metering – the samoa experience apia urban supply 1995 – 2002
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DEMAND MANAGEMENT Customer Metering – the Samoa Experience
Apia Urban Supply1995 – 2002
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SAMOA ISLANDS Volcanic – 2 main islands Rainfall 2100-7000mm
(wet period) Population – 175,000
(2001 Census)
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SAMOA WATER AUTHORITY Corporatized 1994
Move towards financial independence Water Supply – 82% popn (17000
customers) Treatment Plants – 3 Raw Water systems Boreholes
O & M Expenditure $7 m/yr
Community schemes – approx 15% No water supply – less than 5% popn. ISP, EU projects
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Scope of Case Study Apia Urban Area 1995 – limited metering 1999 – A.W.S.C.P
Full scale metering program About 4000 meters
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Background - APIA URBAN AREA Pop = approx 38,000 Incomes = $2400 - $80,000 / annum Central Business District Excessive demands
Approx – 900 l/c/d (pre-metering 1999) Water is free, from God, plentiful
Treated and Raw supply (80% mixed in 1999) Low pressures, demand exceed production treated Inaccurate maps
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DEMAND MANAGEMENT INITIATIVES No Formal Demand Management Strategy Metering and Tariff
Treated supply Progressive $0.12/m3/d - $1.40/m3/d
Leak Detection Improving Operation & Maintenance
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HOW TO METER APIA ?
Isolate areas to be supplied by treated water Network modifications – valves, re-route pipes
Meter target area Extend area – when demand reduction allows Continue until 100% coverage
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METERING PROCESS Step 1 – Isolate Target Area
Treated and sufficient quantity
Step 2 – Awareness & Acceptance
Media campaign Village groups consultations Matai consultation (advisory
committee) Disconnect supply
Step 3 – Installation & Billing Pre-fabrication at workshop 3 month grace period
Monthly reading Counselling & assistance
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RESULTS & LESSONS LEARNT Reduction of Demand
Approx 350l/c/d (2002) Extend Treated water coverage to 80% Community Awareness of metering Consultation using traditional hierarchy (matai) Above-ground meters
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FURTHER ACTIONS Demand Management Strategy
UFW – theft, illegal connections System Performance – data Asset Mgt Strategy
O&M improvements Leak Detection Disaster (Drought) mgt Mapping
New Tariff Structure (proposal) O&M simple cost recovery 2 bands rather than logarithmic 5 year + review ‘free’ portion – 0.5m3/d
Billing Process Time and labour intensive
Review of Progress Customer survey Metering records - consumption Extension of treated water supply
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CHALLENGES IN DEMAND MANAGEMENT FOR SWA
Influx of 3500 initially (total 6000) meters – EURWSP Doubling of system assets – EURWSP New Computerised Asset Management System Successful implementation of new Tariff Structure
(awaiting Cabinet approval) and impact on consumption
Translating results of progress review into actions for improvement
Limited local Technical expertise (only 5 engineers in SWA)
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Thank you