NONNON--REVENUE WATER BRANCHREVENUE WATER BRANCH
OVERVIEW OF NRW INITIATIVES IN DURBAN OVERVIEW OF NRW INITIATIVES IN DURBAN
SOUTH AFRICASOUTH AFRICA
Presentation African Utilities WeekPresentation African Utilities Week
BY: SIMON SCRUTON – MANAGER: NRW BRANCH Ethekwini Municipality
It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change – Charles Darwin
Contents of Presentation
� eThekwini Municipality Stats
� System Characteristics
� NRW Strategic Plan Objectives
� Delivery Model
� Targeted Figures
� Real Loss Interventions
� Apparent Loss Interventions
� Trends
• 3,5 million people
• 646 000 properties
• Supply 900 Ml/day of water from 9 Treatment Works
• Treat 500 Ml/d of Waste Water
• 263 Water Reservoirs
• 27 Waste Water Treatment Works
• 7 000 km of sewer mains
• 12 000km of water mains
• 440 000 water connections
• Combined annual expenditure of R2.5bn (2008/09)
• Combined annual expenditure of R4.1bn (2009/10)
• Municipal budget 2009/10 R23bn
eThekwini Municipality Quick Stats
System OverviewNorth Operational Area:3000km of Water Mains
120000 Service Connections214 PRVs
79 Reservoirs
South Operational Area:4500km of Water Mains
180000 Service Connections200 PRVs
104 Reservoirs
West Operational Area: 3600km of Water Mains
120000 Service Connections650 PRVs
78 Reservoirs
NRW Strategic Plan Objectives
� NRW by volume for 2006/2007 – 30.6%� NRW by volume for 2007/08 – 36.4%� Target for June 2013 – 28% loss (R175m pa
savings)� Target for June 2018 – 25% loss (ILI 4.5)
� Main drivers:-� Reduce real losses
� AC Mains replacement� Active leak detection� Pressure reduction� Rezoning� Improving reservoir integrity
� Reduce apparent losses� Illegal connection rectification� Billing data integrity improvements� Improve meter accuracy
NRW Strategic Plan Objectives
� The delivery model allows for:-
� Area specific support
� Dedicated management of NRW activities
� Accountability for performance
� Cost effective management of EWS activities (Billing analysis, Leak detection, Advanced pressure management)
NRW Programme Organogram
IWA Standard Water Balance
Water Exported Billed Water m3/day Exported± x % Billed m3/day
Own Authorised ± x % RevenueSources Consumption Billed Metered Water m3/day m3/day Consumption m3/day± x % ± x % m3/day ± x %
Authorised ± x %Consumption Billed Unmetered
m3/day Consumption± x % m3/day
± x %Unbilled Metered
ConsumptionUnbilled Authorised m3/day
System Water Consumption ± x %Input Supplied m3/day Unbilled Unmetered
m3/day m3/day ± x % Consumption± x % ± x % m3/day
Imported ± x % Non-revenueWater Unauthorised Water
m3/day Apparent Consumption m3/day± x % Losses m3/day ± x %
Water m3/day MeteringLosses ± x % Inaccuracies m3/day m3/day± x % Mains Leaks
Real m3/dayLosses Reservoir Overflows
m3/day m3/day Service connection± x % Leaks
m3/day
Targeted NRW Reduction Figures
The higher the pressure – the bigger the loss!
SIV Reduction – Real Losses
� Rezoning - New Pressure Standard -2.5bar – 6bar
� Advanced pressure management (optimising existing + controllers)
� Active prv Maintenance
� GSM based failure detection devices on prv’s
� Leak detection
� AC mains relay (incl rezoning + replace connection pipes)
� Analysis of Faults data to improve speed and quality of repairs
� Reservoir overflows (incl response time)
� Reservoir integrity (leaks)
Advanced Pressure Management in the Durban CBD
Results to Date:
SIV Reduction (Cont)
� Pilot project to fit GSM based alarms on downstream side of pressure reducing valves (prv) to detect prv failure
� Inexpensive and simple 2 point prv control introduced at 100 sites to lower pressure during all off-peak times
� Reactive repairs – 24 hour call centre - Repair ±300 faults per day
Leak Detection� Yearly Contracts in different
operational areas
� Level 1, 2, 3, 4, 5 leak detection
� Stats 31/01/2010� Length of Mains survey =
24753km
� Leaks found = 17709 (Visible, Non-visible, SC, Main Line, Valve Leaks, Meter leaks)
� Leaks Repaired = 14723! (UTL is an issue)
� Change in methodology to sweep with plumbers 1st to stabilise an area
• New standards for meter installations• Change out programme for meters 40mm and
greater and older than 10 years (Top 1000) Ensure Top 200 meters < 5 years old
• Change out programme for domestic meters older than 20 years
• Checking Council databases for properties with existing buildings or electrical connections that don’t have a water connection
• Checking of all Government owned properties for multiple connections
• Checking properties where connections were previously removed
• 75 Custody Transfer Points – Bulk Purchase from Umgeni Water
• Top 17 sites account for 99% of volume purchased• R3m / day
Apparent / Commercial Losses
Corrective Actions – Unbilled
Unmetered Consumption
� Programme to rectify all consumers with water on site but no registered connection
� New policy approved by Council 03 December 2009 and 3 month amnesty will be offered per ward
� Task team has been formed and communication has commenced
� Key activities will be data cleansing, Councilor liaison consumer liaison and education, meter installation and enforcement
� Formal addresses a problem and on-site billing will be piloted
Allied Interventions
� Asset management is being implemented across the Unit
� Risk management has been implemented across the Unit
� Data cleansing and launch of the new prv database
� Performance management of senior staff
� Increased publicity and communication
� Buy-in from all Deputy Heads and recognition that the reduction of NRW is a key strategic initiative
REAL LOSS REDUCTION:
Pressure reduction (rezoning) Number of new PRV sites (all sources) 350 PRV's Baseline Target 20 40 60
(AC Mains: 100; NRW PSC's: 100; EWS Design: 21;
POT: 100; EWS NRW:30)
Achievement to
date9 24 89
Performance to date
(%)45% 60% 148%
Advanced control recommission existing time controllers 50 sites Baseline Target 0 12 24
Achievement to
date0 8 17
Performance to date
(%)0% 67% 71%
Advanced control commission new controllers 50 sites Baseline Target 2 2 2
Achievement to
date2 2 2
Performance to date
(%)100% 100% 100%
Leak detection and repair length of mains surveyed (km) 18000km Baseline Target 1600 3200 4800
Achievement to
date2759 3910 5405
Performance to date
(%)172% 122% 113%
Mains replacement to be laid and commissioned (km) 700km Baseline Target 60 120 180
Achievement to
date53 157 185
Performance to date
(%)88% 131% 103%
NRW (PSC), AC
Mains, Design
POT, NRW
(EWS)
NRW (POT)
NRW (PSC)
AC Mains
KPM’s Monitored by the Head EWS
Trends
World Bank Benchmarking Initiative
Dennis Mwanza –World Bank Kenya
Conclusions� In order for any NRW reduction
intervention to be successful, the entire water company must fully support all aspects of loss management and provide a coordinated effort to reduce all NRW.
� Consumer education is equally important. Unless the consumers accept and subscribe to our policies we will forever be removing vast numbers of illegal connections and penalising those who do not pay.
Conclusions
� Stricter policy and enforcement enable the company to improve performance. This will be pivotal with the suspected ICR programme.
� The lowering of the design pressures is having a great impact (NRW reduction, bursts, pipeline life)
� The tide has started to turn and the results are becoming visible.
Conclusions
� This programme has realised savings of R210m in the past 3 financial years at EWS at a cost of R78.6m
Our enemies are innovative and resourceful, and so are we. They never stop thinking about new ways to harm our country and our people, and neither do we – George Bushism
Thank you.
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