An Overview of the IWA Water Loss Specialist Group. Jo Parker and Stuart Trow WLSG regional representatives for North West Europe

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2 An Overview of the IWA Water Loss Specialist Group Jo Parker and Stuart Trow WLSG regional representatives for North West Europe

3 What is IWA and what does it do? - An Association for Water Professionals countries, 7000 members and corporates - 50 Specialist Groups covering all water cycle topics (from catchment to customer) - Promoter of best practice (research and application) - Knowledge transfer - Encourages Young Water Professionals

4 The IWA Water Loss Specialist Group - Formed in 2002, international conferences held in venues across the world every two years - Comprises a Management Team, Regional Representatives, Task Groups, and over 1400 Members - Regional Reps: World divided into regions and countries. Promote good practice and support - Task Groups: Initiatives to lead research and produce guidelines on best practice

5 Management Chair Ronnie McKenzie Secretary - Jurica Kovac Past Chair Tim Waldron Other Committee Members Kenneth Brothers Bambos Charalambos Malcolm Farley Kenneth Brothers

6 Regional Representatives West and North Europe: Mr. Stuart Trow Mrs. Jo Parker Russia and Neighboring Region: Mr. Stuart Hamilton USA and Canada Mr. Ken Brothers Central America and Caribbean: Mr. Paul Fanner East and South Europe: Mr. Bambos Charalambous Mr. Marco Fantozzi Northern Africa and Middle East: Mr. Jan Jennsen Mr. Bambos Charalambous China and Neighboring Region: Mr. Malcolm Farley South America: Mr. Julian Thornton South East Asia: Mr. Roland Liemberger Southern Africa: Mr. Ronnie Mckenzie Australia New Zealand and Pacific: Mr. Richard Taylor Mr. Ian Maggs

7 Activities International Conferences Regional Conferences Working Groups with outputs Research & international comparisons Concepts Reports Best Practice Guides

8 Working Groups and Guidance Notes Water Balance District Meter Areas The mechanics of leakage and the impact of leak run time Pressure Management Performance Indicators Target Setting, Economics and Strategy Active Leakage Control Apparent Losses Intermittent supplies

9 Water Balance Water Balance in m3/year Home Billed Authorized Consumption Billed Metered Consumption 3,461,936 m3/year Revenue Water Authorized Consumption 3,602,716 m3/year Billed Unmetered Consumption 140,780 m3/year 3,602,716 m3/year System Input Volume 3,610,516 m3/year Error Margin [+/-]: 0.0% Unbilled Authorized Consumption 7,800 m3/year Error Margin [+/-]: 7.9% Unbilled Metered Consumption 0 m3/year Unbilled Unmetered Consumption 7,800 m3/year Error Margin [+/-]: 7.9% 4,474,714 m3/year Error Margin [+/-]: 5.0% Commercial Losses 371,944 m3/year Unauthorized Consumption 9,850 m3/year Error Margin [+/-]: 9.7% Non-Revenue Water Water Losses 864,198 m3/year Error Margin [+/-]: 7.4% Customer Meter Inaccuracies and Data Handling Errors 362,094 m3/year Error Margin [+/-]: 7.6% 871,998 m3/year Error Margin [+/-]: 25.7% Error Margin [+/-]: 25.9% Physical Losses 492,254 m3/year Error Margin [+/-]: 45.8%

10 Zone flow analysis (night flows)

11 m 3 / day m 3 / day m 3 / day Time Makes all the Difference! 75 1 Day reported mains burst 75 m 3 25 A 14 Days L R reported service connection burst 350 m 3 25 A 365 Days L undetected service connection burst >9,000 m 3 R

12 Fixed and Variable Discharge (FAVAD) Principle Leakage is proportional to pressure P N1 N1 = 0.5 for fixed area leaks Cracks, splits and holes in rigid pipes N1 = up to 1.5 for variable area leaks Joints (all pipes) Fittings (all pipes) Splits in flexible pipes

13 Real Losses UARL calculation based on mains length, number of services, customer meter location and average pressure Speed Active and Quality Leakage of Repairs Control Pressure Management Management Unavoidable Annual Real Losses UARL Potentially Recoverable Real Losses 4-Component Approach to ELL Economic Annual Real Losses EARL Speed Active and quality Leakage of repairs Control Current Annual Real Losses CARL Pipeline and Pipe Assets Materials Management: Management: selection, Selection, installation, maintenance, Installation, Maintenance, renewal, replacement Renewal, Replacement

14 Apparent Losses

15 NRW as a Percentage of Production is Misleading If billed water falls while losses are steady, % NRW rises!

16 Infrastructure Leakage Index ILI from 1 to ?

17 European Union Report October 2014 Recommendations for: Supply demand balance Drought management Country and region specific regulation Leakage Targets Performance Indicators Leakage measurement Water Conservation Pressure management Leak run time Asset renewal System design Long term view

18 Conference Attendees

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20 IWA Connect Our web space: IWA Connect web page (news, free materials, contacts)

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24 Waterloss 2018