Benchmarking Water Loss Performance: The Death of Unaccounted For Water

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1 Benchmarking Water Loss Performance: The Death of Unaccounted For Water Presented by: Tory N. Wagoner, P.E./P.L.S. Director of Operations, Cavanaugh

2 M36: Water Audits and Loss Control Programs: AWWA Water Loss Control Committee

3 Quiz According to the AWWA, an acceptable level of Unaccounted For Water is: A.15% B. 10% C. 5% D.0%

4 Fire Dept Usage Operational Flushing Tools for control include efficient flushing practices and awareness campaigns IWA/AWWA Water Balance Own Sources Water Imported ( allow for known errors ) Water Exported Water Supplied Billed Authorized Consumption Non-physical / revenue loss - slow meters, billing issues and theft Authorized Cost impacts at retail Consumption rate. Tools Total for control include data management, System quality Input control policies/practices, & meter testing & repair Unbilled Authorized Consumption Physical loss - leakage Cost impacts at wholesale rate Tools for control include Water leakage and Losses pressure management Apparent Losses Real Losses Revenue Water Non- Revenue Water Billed Water Exported Billed Metered Consumption Billed Unmetered Consumption Unbilled Metered Consumption Unbilled Unmetered Consumption Unauthorized Consumption Customer Metering Inaccuracies Systematic Data Handling Errors Leakage on Mains Leakage on Service Lines Leakage & Overflows at Storage

5 2003 Inconsistent use and interpretation Unreliable indicator of performance Fails to segregate loss into its components for effective management

6 Unaccounted For Water Unaccounted For Water Percentage

7 Water Loss or NRW as % of Supply

8 MGD Water Loss as a Percentage of Supply is not an Indicator of Performance Water Supplied (MGD) Authorized Consumption (MGD) Water Loss (MGD) Major Industry 5 0

9 MGD Water Loss as a Percentage of Supply is not an Indicator of Performance Water Supplied (MGD) Authorized Consumption (MGD) Water Loss (MGD) Water Loss (Percent of Supply) 26% 24% 25 22% % 18% 16% 10 5 Major Industry 14% 12% 0 10%

10 MGD Water Loss as a Percentage of Supply is not an Indicator of Performance Water Supplied (MGD) Authorized Consumption (MGD) Water Loss (MGD) Development Boom Great Recession, Rate Increases, Conservation New Normal 0

11 MGD Water Loss as a Percentage of Supply is not an Indicator of Performance Water Supplied (MGD) Authorized Consumption (MGD) Water Loss (MGD) Water Loss (Percent of Supply) 28% 26% 24% 22% 20% 18% 16% 14% 5 12% 0 10%

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13 Unaccounted For Water Water Loss or NRW as Percentage of Supply Unaccounted For Water Percentage

14 Quiz According to the AWWA, an acceptable level of Unaccounted For Water is: A.15% B. 10% C. 5% D.0%

15 Quiz According to the AWWA, an acceptable level of Unaccounted For Water is: A.15% B. 10% C. 5% D.0%

16 3-V Volume MG per Year Gal/connection/day Leakage Index Value $ per Year Economic Loss Index Validity Water Audit Data Validity Score 95% Confidence Limits Key Data Input Grades

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18 Volume NRW Components - By Volume (MG) - Level 2 Value NRW Components - By Value Level 2 Real Loss Apparent Loss Unbilled Consumption Real Loss Apparent Loss Unbilled Consumption

19 Volume NRW Components - By Volume (MG) Level 3 Value NRW Components - By Value Level 3 Reported Leakage Data Handling Background Leakage Theft Unreported Leakage Data Handling Meter Inaccuracy Theft Unbilled Metered Unbilled Unmetered Real Loss Apparent Loss Unbilled Consumption Reported Leakage Background Leakage Unreported Leakage Meter Inaccuracy Unbilled Metered Unbilled Unmetered Real Loss Apparent Loss Unbilled Consumption

20 Volume NRW Volume (BG/year) Value NRW Value ($/year) 4.6 BG $5 M Current 8.2 BG Current $7.3M Economically Optimized 3.6 BG Economically Optimized $2.3M

21 $3.4 M $11.6 M Volume NRW Volume (BG/year) (SEWER) $4.5M Value NRW Value ($/year) $8.5 M 4.6 BG Current 8.2 BG Economically Optimized 3.6 BG Current (WATER) $7.3M (SEWER) $1.1M Economically Optimized (WATER) $2.3M

22 Water Audit Data Validity Score: 74 out of 100 (Validated) Economic Metrics Volume 95% Confidence Limits (+/-) Value - Water Only Value - With Sewer Non-Revenue Water 24,744 gal/conn/yr 14.2% $ Non-Revenue Water 8,235 MG/yr 14.1% $ 7,166,110 11,568,137 Target NRW Recovery (prel) 4,037 MG/yr 25.0% $ 4,707,445 7,985,285 NRW Economic Index (ratio of current vs optimum NRW cost) % Confidence Limits (+/-) $ $/conn/yr 16.6% $ $/yr 16.6% $ $/yr 25.0% Where is Optimum? Value of recoverable NRW (case for action) Areas of focus for NRW recovery (component analysis)

23 Benchmarking Water Loss Performance: The Death of Unaccounted For Water Presented by: Tory N. Wagoner, P.E./P.L.S. Director of Operations, Cavanaugh