African Utility Week Leak Detection and Repair in the ethekwini Municipality

Transcription

1 African Utility Week Leak Detection and Repair in the ethekwini Municipality EWS NRW Branch

2 Leak Detection and Repair Progress 1. Review of Programme 2. Review of Real Loss Reduction Approach 3. Targets, Monitoring and Evaluation 4. Leak Detection and Repair Progress Report 5. Impact and Results 6. Challenges 7. Lessons Learned 8. Further Research 9. Communication/Publicity EWS NRW Branch 2

3 Review of NRW Reduction Programme Monitoring & Evaluation Preparation & prioritisation System maintenance Real loss reduction Apparent loss reduction Infrastructure Assessment & Upgrade Meeting & sustaining NRW target levels Quality Assurance Financial Management Programme Management EWS NRW Branch 3

4 Review of NRW Reduction Programme ethekwini Water and Sanitation Monthly Volumes and Connections May 2004 to July Monthly Volumes (kl) Number of Connections May-04 Nov-04 May-05 Nov-05 May-06 Nov-06 May-07 Nov-07 May-08 Nov-08 May-09 Nov-09 May Total SIV - Monthly ethekwini Water Sales Total number of connections EWS NRW Branch 12 per. Mov. Avg. (Total SIV - Monthly) 12 per. Mov. Avg. (ethekwini Water Sales) 4

5 Review of NRW Reduction Programme 2006/07 - NRW 30,6%; budget R17,1m 2007/08 - NRW 36,4%; budget R24,2m 2008/09 - NRW 38,9%; budget R37,3m 2009/10 - NRW 37,6%; budget R65,0m 2010/11 - NRW Target 35%; budget R75,0m EWS NRW Branch 5

6 Review of NRW Reduction Programme ethekwini Municipality Water Purchase, Sales and Connection Trends Average Daily Volumes (kl/day) Number of Registered Connections / / / / / / Average SIV (kl/day) Average Water Sales (kl/day) Total Number of Connections in Municipality EWS NRW Branch 6

7 Review of NRW Reduction Programme 45.0% ethekwini Municipality Non-Revenue Water and Inefficiency of Use Trends 40.0% 36.4% 38.9% 37.5% 35.0% 31.8% 33.4% Non-Revenue Water by Volume (%) 30.0% 25.0% 20.0% 15.0% 29.0% 19.1% 19.0% 19.2% 22.1% 24.9% 25.8% 10.0% 5.0% 0.0% 2004/ / / / / /10 EWS NRW Branch 7 Fi46 NRW by Volume (%) WR1 Inefficiency of Use (%)

8 Review of NRW Reduction Programme 9.4 ethekwini Municipality Infrastructure Leakage Index Trends Infrastructure Leakage Index (ILI) / / / / / /10 Op29 Infrastructure Leakage Index EWS NRW Branch 8

9 Review of NRW Reduction Programme ethekwini Municipality Total Water Losses per Connection Trends Non-Revenue Water by Volume (%) / / / / / /10 EWS NRW Branch 9 Op23 Total Water Losses per Connection (l/conn/day)

10 Review of Real Loss Reduction Approach 5 different levels of leak detection: Level 1 visual Level 2 listening + correlating suspected leaks Level 3 correlation Level 4 leak noise loggers Level 5 trunk mains All of these carried out by leak detection contractor New addition use of Category B plumbers; and step testing EWS NRW Branch 10

11 Review of Real Loss Reduction Approach Why leak detection and repair? EWS NRW Branch 11

12 Level 1 Leak Detection

13 Level 2 Leak Detection

14 Level 3 Leak Detection

15 Level 4 Leak Detection

16 Level 5 Leak Detection

17 Targets, Monitoring & Evaluation Indicator Financial Year 2004/ / / / / /10 Total Number of Connections in Municipality Fi46 NRW by Volume (%) 29.0% 31.8% 33.4% 36.4% 38.9% 37.5% WR1 Inefficiency of Use (%) 19.1% 19.0% 19.2% 22.1% 24.9% 25.8% Op29 Infrastructure Leakage Index Op23 Total Water Losses per Connection (l/conn/day) Average SIV (kl/day) Average Water Sales (kl/day) Real Loss Volume (kl/day) Unbilled Authorised and Illegal Volume (kl/day) Total Water Losses (kl/day) Non-Revenue Water Volume (kl/day) Metering Inaccuracies (kl/day) Illegal Consumption (kl/day) EWS NRW Branch 17

18 Targets, Monitoring & Evaluation Monthly water balances per reservoir zone.. MONTHLY WATER BALANCE COMPONENT TRENDS - December 2009 Entire Southern Operational Area Current Month Analysis Remainder/ Unassigned Legend: Green - all data confirmed and available Orange - some SIV meters are missing, or zone may be breached Red - no SIV meters installed Grey - to be separated later; have been included in other areas Adams Mission 1 Reservoir Athlone Park Chatsworth 4 Ehlanzeni Garden Lots Klaarwater Lower Illovo 1 Northdene 1/2 Shallcross Reservoir Umbumbulu Umlazi 5 Adams Mission 2 Reservoir Bluff 1 Chesterville Ehlanzeni (Metro) Glenwood 2/3 KwaMakutha Magabeni 1 North Ridge Sherwood 1/2 Umgababa Umlazi 6 Adams Mission 3 Reservoir Bluff 2/3 Clansthal Ehlanzeni (Umgeni) Harinagar Reservoir Lamont Magabeni 2 Panarama Park Smithfield Umkomaas 1 Umnini Adams Mission 4 Reservoir Bluff South Clansthal 3 Ensimbini Illovo Beach Launceston Road Malabar Hills Ridge End Smithfield HL Umkomaas 2 Umzinto 5 Adams Mission 5 Reservoir Cato Manor Craigieburn 1 Extreme South Isipingo Beach Lewis Drive Midnite Cafe Ridge View South Ridge Umlazi 1/7 Wentworth Adams Mission 6 Reservoir Chatsworth 1 Craigieburn 2 Folweni Isipingo Hills Lotus Park Mobeni 1/2 Ridley Park St Thomas Umlazi 2/8 Westcliff Almond Road Chatsworth 2 Currie Road Folweni 2 Isipingo Rail Lovu Mobeni Rear Rosetta Toti Purification Works Umlazi 3 Woodlands 1/2 Amagcingo Chatsworth 3 Doonside Firwood 1/2 Isolempilo Lovu ET Montille SAICCOR Umbogintwini Umlazi 4 Woodlands 3/4 EWS NRW Branch 18

19 Leak Detection and Repair Progress Report The leak detection and repair strategy was amended to use Category B plumbers in informal areas This proved extremely successful, with the number of leaks repaired increasing dramatically in the last few months, and was achieved at a lower cost. 98% of the target for length of mains surveyed in the year was reached A total of leaks were located and repaired. This resulted in 1.2 leaks/km being found and fixed, an improvement from 0,88 leaks/km in the previous financial year. EWS NRW Branch 19

20 Leak Detection and Repair Progress Report Baseline Target Achievement to date Performance to date (%) 172% 122% 113% 107% 103% 98% 99% 106% 100% 96% 94% 98% EWS NRW Branch 20

21 Leak Detection and Repair Progress Report Visible leaks 403 Non-visible leaks EWS NRW Branch 21

22 Leak Detection and Repair Progress Report Main Line Leaks Service Connection Leaks EWS NRW Branch 22

23 Leak Detection and Repair Impact and Results 2500 FEB/MARCH/APR/MAY = 1425 leaks found & repaired Umlazi 1 Real Loss Reduction Flow Profile Monitoring FEB/MARCH/APR/MAY/JUNE = 1740 leaks found & repaired 2000 FEB/MARCH/APR/MAYJUNE/JULY = 2007 leaks found & repaired FEB/MARCH/APR/MAY/JUNE/JULY/AUG = 2440 leaks found & repaired Flowrate (kl/hr) kl/day kl/day kl/day kl/day kl/da PRV Settings Optimised Theoretical Average Zone Pressure : 57m Theoretical Average Zone : 56m /09/ /08/ /06/ /05/ /03/ /01/ /12/03 EWS NRW Branch 23 Logging Period (05/01/ /08/2010)

24 Leak Detection and Repair Impact and Results Chatsworth 4 Real Loss Reduction Flow Profile Monitoring 2000 FEB = 6 leaks found & repaired FEB/MARCH = 11 leaks found & repaired 1800 FEB/MARCH/APR = 146 leaks found & repaired FEB/MARCH/APR/MAY = 403 leaks found & repaired AVE = AVE = kl/hr 800 Flow Rate (kl/hr) EWS NRW Branch /05/22 00: /05/12 00: /05/02 00: /04/22 00: /04/12 00: /04/02 00: /03/23 00: /03/13 00: /03/03 00: /02/21 00: /02/11 00:00 Logging Period (21/02/ /05/2010)

25 Leak Detection and Repair Impact and Results Sherwood Real Loss Reduction Flow Profile Monitoring 2000 FEB = 32 leaks found & repaired 1800 FEB/MARCH = 69 leaks found & repaired FEB/MARCH/APR = 109 leaks found & repaired Flow rate (kl/hr) AVE = kl/hr AVE = kl/hr AVE = kl/hr AVE = kl/hr EWS NRW Branch /07/21 00: /07/01 00: /06/11 00: /05/22 00: /05/02 00: /04/12 00: /03/23 00: /03/03 00: /02/11 00: /01/22 00: /01/02 00:00 Logging Period (20/01/ /06/2010)

26 EWS NRW Branch 26

27 EWS NRW Branch 27

28 EWS NRW Branch 28

29 Leak Detection and Repair Impact and Results Intervention Description Verifiable Impact on NRW (Ml/day) Real Loss Reduction: Leak Detection and Repair -5.3 Pressure Reduction -2.9 Advanced Pressure Management System attrition 43.9 Sub-Total Real Loss Reduction 9.1 Billing Improvement: Metro Housing Projects 4.5 Small Diameter Meter Replacement 0.4 Large Diameter (ICI) Meter Replacement 2.7 Metering WD s/ebu s 3.5 Amnesty Programme 0.3 Ablution Blocks 0.8 Incomplete Connections -3.6 New Connections/Normal Growth 7.1 Sub-Total Billing Improvement 15.7 EWS NRW Branch 29

30 Leak Detection and Repair Methodology... Preparation EWS NRW Branch 30

31 Leak Detection and Repair Methodology... Briefing EWS NRW Branch 31

32 Leak Detection and Repair Methodology... Detection EWS NRW Branch 32

33 Leak Detection and Repair Methodology... Leaks EWS NRW Branch 33

34 Leak Detection and Repair Methodology... Leaks EWS NRW Branch 34

35 Leak Detection and Repair Methodology... Repair EWS NRW Branch 35

36 Leak Detection and Repair Methodology... Repair EWS NRW Branch 36

37 Leak Detection and Repair Methodology... Illegal Connections EWS NRW Branch 37

38 Leak Detection and Repair Methodology... Sahara Inspection EWS NRW Branch 38

39 Leak Detection and Repair Methodology... Smartball Inspection EWS NRW Branch 39

40 Challenges 1. Competence of leak detection contractors 2. Non-reporting of leaks in township areas (use of toll-free number) 3. Turn-over of roster plumbers (two week shifts) 4. Tampering with water infrastructure and repeated illegal connections 5. Internal leaks 6. Pipeline materials EWS NRW Branch 40

41 Lessons Learned 1. Leak detection in informal areas as well as in formal reticulation systems 2. Plastic fittings preferable to brass fittings 3. Rather concentrate in specific areas than stretch resources over greater area 4. Repeated multiple sweeps required to attain and sustain low levels of leakage 5. Theoretical and practical competence tests essential to ensure quality of work and desirable impact 6. Very few non-visible leaks found EWS NRW Branch 41

42 Further Research 1. Masters Research has commenced in : Extending the life of pipelines, delaying pipe replacement and establishing drivers that prioritise pipeline replacement Development of appropriate procedures that can be used to monitor the effectiveness and sustainability of leak detection in informal areas EWS NRW Branch 42

43 Consumer Awareness and Publicity 1. Media consultant appointed and communication strategy designed and implemented (through NRW Programme) 2. Media campaign through TV, radio, magazines and newspapers 3. Existing community liaison continued through Customer Service Agents (Customer Services) 4. Use of Community Focus Groups 5. Targeted street pole signage EWS NRW Branch 43

44 Street Pole Signage EWS NRW Branch 44