Non- Revenue Water Management in Cyprus

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1 WORKSHOP Non- Revenue Water (NRW) Reduc2on in Urban Water U2li2es Experiences and Challenges in the Mediterranean Region, Non- Revenue Water Management in Cyprus Bambos Charalambous Head Technical Services Water Board of Lemesos Lemesos, Cyprus (uncl October 2012) Managing Director Hydrocontrol Ltd Lemesos, Cyprus

2 Water Management in Cyprus 2

3 Recent Water SituaCon in Cyprus Gradual change in the climate Substantial decrease in annual rainfall >20% Reduction in the runoff into the reservoirs > 40% Periods of low rainfall are becoming more frequent Demand is continuously increasing Frequent periods of low or no rainfall : , , Government forced to apply water restriction measures o Drastic water cuts in irrigation o Severe restrictions to domestic water supply Add Water to the National Balance: o Construction of Desalination plants: 60Mm 3 (75% of total potable needs) o Use of treated effluent in agriculture: 10Mm 3 (5% of total irrigation needs) Need for water conservation and leakage management 3

4 Lifeline from Athens to Lemesos in August 2008: m 3 /day 4

5 NRW Management Is a concnuous accvity Is an integral part of distribucon network management Is based on a long term strategy Is cost effeccve especially in water scarce areas HOWEVER ITS SUCCESS DEPENDS: On commitment and dedicacon at all levels AdopCon of appropriate methodologies and technologies Use of appropriate and reliable indicators for benchmarking, such as : litres/service conneccon /day and ILI 5

6 Key Performance Indicators Water Board of Nicosia YEAR % of SIV ILI Lit/conn/day Water Board of Larnaca YEAR % of SIV ILI Lit/conn/day Water Board of Lemesos YEAR % of SIV ILI Lit/conn/day

7 Network Design and Development 7

8 Major Network Developments Water Board of Lemesos Major expansion of storage and supply network Establishment of pressure zones and DMA Installation of SCADA system Pressure reduction study Installation of PRVs in 8 out of 27 DMAs Digitization of all maps of the water distribution system Review of the leakage control activities by external consultant Recommendations for the establishment of a leakage management policy to date DMA re-design and pressure management Use of advanced technology in DMA monitoring and leak detection Adoption of IWA WLTF best practice approach to NRW management Source: WBL 8

9 Key ConsideraCons DMA categories Small : <1000 properties Medium : properties Large : properties Factors considered in DMA design Minimum variation in ground level Single entry point into the DMA Well defined DMA boundaries Area meters correctly sized and located Apply pressure management Source: WBL Continuous monitoring 9

10 Typical DMA Inlet Chamber Source: WBL 10

11 Monitoring and Data Transfer Dedicated Computer in Control Room Data Communication s / sms sent from each DMA Alarms sent to Operator s mobile phone for: o High/Low pressure o High MNF o No flow o Low battery status WWW PSTN and GSM Network PROGRAMMABLE CONTROLLERS IN DMAs 11

12 Pressure Management Reduction in: surges and excess pressures burst rates and background leakage, cut repair costs flow rates of all leaks some components of consumption 12

13 Pipeline and Asset Management High quality materials / Proper installacon High standard of maintenance Pipeline replacement using a decision support system 13

14 Accurate and Comprehensive Metering the first step in establishing how much water is produced and/or being used 14

15 NRW AcCviCes 15

16 Annual Water Balance (m 3 ) ( Top - Down ) Reaching the point of Accountability 16

17 Commercial Losses ( Apparent losses) All customers are metered Water theft o Theft from hydrants o Meter by-passes o Tampering with meters Meter under- registration o Improve meter accuracy o Volumetric meters o Certified meter test bench Meter reading errors o Hand-held devices o Change meter readers routes o Check zero/low consumption Accounting errors o Billing software o Threshold alarms Commercial Losses = Loss of Revenue (valued at retail billing rates) Source: Rizzo and Cilia,

18 Physical Losses (Real Losses) 18

19 Speed and Quality of Repairs Number of Pipes Repaired Response Repair Time 712 (34%) Next day (13.5%) (55%) Same day (85%) Next two days (1.5%) 19

20 AcCve Leakage Control 20

21 Pressure Management DMA (Sector 2) AZNP (m) Actual MNF (m³/hr) Background losses(m³/hr) Locatable losses (m³/hr) before after before after before after before after ,92 2,16 0,63 0,24 1,88 0, ,69 3,85 3,39 1,65 0,16 0, ,07 2,24 1,53 0,71 0,05 0,03 30 m 3 /hr ,58 2,56 1,70 0,82 0,35 0, ,50 2,52 1,68 0,82 2,23 0,11 LEAKAGE REDUCTION ,96 9,78 5,42 2,41 4,16 3, ,04 6,84 5,62 2,55 0,37 0, ,52 10,44 5,91 3,38 5,11 2, ,60 7,20 3,42 3,03 0,51 0,50 Annual water 36 4,06 saving 3,73 1,13 = 220 0, ,01 1,85 m ,80 18,00 5,57 4,60 9,37 6, ,01 7,92 4,63 or 3, , , ,17 4,32 1,32 1,05 2,21 1, ,45 3,96 1,48 1,10 1,48 1, ,55 2,44 0,32 0,23 2,26 1,24 Total before 117,92 43,75 34,32 Total after 87,96 27,09 21,02 21

22 Reduced Burst Frequency ( Reported Leaks) Description Number of bursts reported Reduction of leaks Before (7 months) After (7 months) Distribution mains % Communication pipes % ANNUAL COST SAVING IN PIPE Comparison BURST of Results REPAIRS Location Pressure Reduction Overall reduction in burst incidents Cyprus (Water Board of Lemesos) Australia (A.Lambert) 32% 41% 40% 55% 22

23 Leakage Monitoring 23

24 DMA Flow and Pressure Monitoring 24

25 MNF Analysis PRIORITISE LEAKAGE ACTIVITIES BASED ON ESPB AND ON VALUE OF WATER SAVED 25

26 MNF Monitoring 26

27 Awareness (A)=2days Location (L)=8days Repair (R)=1day Leak LocaCon and Repair Loss of water=4200m 3 A L R Crack 7 mm wide on DN150mm AC pipe Awareness (A)=2days Location (L)=28days Repair (R)=2days Loss of water=7200 m3 A L R Three leaks were located and fixed. 27

28 TargeCng and Benchmarking 28

29 TargeCng and Benchmarking Goal Sefng IdenCfied areas to be improved PrioriCsed most effeccve accons Benchmarking (Process and Metric) Decided on Key Performance Indicators Checked and compared performance to other uclices 29

30 Non Revenue Water Financial PI basic (IWA Level 1, Fi 36) Drought Years Intermittent Supply Source: WBL 30

31 Litres / service conneccon / day OperaConal PI for Real Losses basic ( IWA Level 3, Op 24 ) Technical Performance Category: A pressurised system : average pressure 40 m (Developed Countries) Drought Years Intermittent Supply : <100 litres/connection/day Source: Liemberger,2005 Source: WBL 31

32 Infrastructure Leakage Index Operational PI for Real Losses Detailed (IWA Level 3, Op 25) Technical Performance Category: A (ILI 1-2: Excellent no specific intervention required) (Developed Countries) Source: Liemberger, 2005 Drought Years Intermittent Supply Source: WBL 32

33 Source: Seago, McKenzie, Liemberger, Halifax 2005 Total of 146 data from 31 countries DEVELOPED COUNTRIES DEVELOPING COUNTRIES I L I Cyprus 33

34 Intermiient Water Supply 34

35 20 DMAs: 373Km: 45%total Description Number of reported breaks %increase Mains 1/7,14km 1/2,38km 300 Service connections 15,5/1000 connections 29,7/1000 connections

36 TOP DOWN Effects of Intermiient Supply Significant increase in Total Leakage BOTTOM UP 36

37 Effects of Intermiient Supply System Input Volume Vs ConsumpCon Year System Input Volume (m 3 ) Customer Consumption (m 3 ) Total Difference Total Difference

38 Effects of Intermiient Supply System Input Volume Vs ConsumpCon Year System Input Volume Customer ConsumpCon 2007 Before IntermiSent Supply 0% (base line) 0% (base line) 2008 IntermiSent Supply - 17,5% - 9,2% 2009 IntermiSent Supply - 9,1% - 8,9% 2010 AXer IntermiSent Supply +12,8% - 1,2% 38

39 Cost of Intermiient Supply Cost to the Water Board of Lemesos for the 2 years ( ) of Intermittent Supply: Loss of revenue: o Reduction in sales cost of water saved: Additional operational expenses: o Staff overtime for opening / closing valves: o Repairing additional reported breaks: Additional cost after Continuous Supply was established: o Additional leakage ( ): o Estimated cost of locating leaks: o Estimated cost of repairing leaks:

40 Thank you Bambos Charalambous Tel.: