A Non-Revenue Water Tale of Five Cities

Size: px

Start display at page:

Download "A Non-Revenue Water Tale of Five Cities"

Iris Sherman
5 years ago
Views:

1 A Non-Revenue Tale of Five Cities Tory Wagoner, PE/PLS Cavanaugh & Associates, P.A. 4/25/2017

2 AWWA M36 Methodology State of the Art Auditing & Loss Control M36 1 st Ed. M36 2 nd Ed. M36 3 rd Ed. M36 4 th Ed AWWA Audit Software v1 AWWA Audit Software v4 AWWA Audit Software v5 ~7,000 downloads to date of AWWA Audit Software v5 AWWA Compiler for large audit sets WRF Real Loss Component Analysis Model

Billed Metered Consumption Billed Unmetered Consumption Unbilled Metered Consumption Unbilled Unmetered Consumption Unauthorized

3 IWA/AWWA Standard Balance Own Sources Imported Total System Input ( allow for known errors ) Exported Supplied Authorized Consumption Losses Billed Authorized Consumption Unbilled Authorized Consumption Apparent Losses Real Losses Revenue Non- Revenue Billed 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

Fire Dept Usage Operational Flushing Tools for control include efficient flushing practices and

Supplied Billed Authorized Consumption Non-physical / revenue loss - slow meters, billing issues

Tools Total for control include data management, System quality Input control

rate Tools for control include leakage and Losses pressure management Unbilled Authorized

Consumption Billed Unmetered Consumption Unbilled Metered Consumption Unbilled Unmetered

4 Fire Dept Usage Operational Flushing Tools for control include efficient flushing practices and awareness campaigns Management of NRW Own Sources Imported ( allow for known errors ) Exported 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 Physical loss - leakage Cost impacts at wholesale rate Tools for control include leakage and Losses pressure management Unbilled Authorized Consumption Apparent Losses Real Losses Revenue Non- Revenue Billed 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 Efficiency Management Determine Loss Volumes Distinguish Types of Leakage/Losses Evaluate Economics Implement Interventions AWWA water audit Apparent & Real Loss volumes breakdown of types of leakage (Component Analysis Model) sources of Apparent Loss costs of losses costs of intervention strategies leak detection repair time improvement pressure management cost effective!

6 Service Connections Indiana Kansas Alabama Kentucky N Carolina

7 Supplied Indiana Kansas Alabama Kentucky N Carolina

8 Non Revenue Indiana Kansas Alabama Kentucky N Carolina

9 Unavoidable Annual Real Loss (UARL) Indiana N Carolina Kansas Alabama Kentucky

10 Infrastructure Leakage Index (ILI) Kentucky Kansas Alabama Indiana N Carolina

11 Data Validity Score Kansas Alabama Kentucky Indiana N Carolina

12 System #1 - Kansas Existing Programs: o Leak Detection o Customer Meter Testing Initial Assessment: o Unrealistically low ILI (0.2) Validation Efforts: o Finished Meter Testing o Billing Data Next Steps: o Calendar Year 2016 Audit ILI solved? Unmetered Interconnection? o o o Large Meter Testing Optimization Small Meter Testing/Optimum Replacement Leak Detection Optimization Test - Thursday, October 20, 2016 Low Flow Rate Clearwell Test Meter Wetwell Starting Level feet Meter Reading: Starting Level feet Ending Level feet Time Start: 10:55 AM Ending Level feet Pump Flow: 2 MGD Total Volume 2,523 cubic feet Time End: 11:10 AM Total Volume 272 cubic feet MG Meter Reading: MG Meter Volume: MG Clearwell Wetwell Starting Level feet Meter Reading: Starting Level feet Ending Level feet Time Start: 11:10 AM Ending Level feet Pump Flow: 2 MGD Total Volume 2,613 cubic feet Time End: 11:25 AM Total Volume 290 cubic feet MG Meter Reading: MG Meter Volume: MG Clearwell Wetwell Starting Level feet Meter Reading: Starting Level feet Ending Level feet Time Start: 11:25 AM Ending Level feet Pump Flow: 2 MGD Total Volume 2,912 cubic feet Time End: 11:40 AM Total Volume 272 cubic feet MG Meter Reading: MG Meter Volume: MG Clearwell Wetwell Starting Level feet Meter Reading: Starting Level feet Ending Level feet Time Start: 11:40 AM Ending Level feet Pump Flow: 2 MGD Total Volume 2,722 cubic feet Time End: 11:55 AM Total Volume 279 cubic feet MG Meter Reading: MG Meter Volume: MG Test Total: MG Test Total: MG Test Total: MG Test Total - Tank Volume: MG (clearwell + wetwell) Test Total - Meter Volume: MG Difference: (0.008) MG UNDER REGISTRATION (7, ) -9.27%

System #2 - Alabama Existing Programs: o Leak Detection based on High Volumes of perceived leakage o % Based Performance Indicator Large Industry left % Loss Problem Initial Assessment: o High

13 System #2 - Alabama Existing Programs: o Leak Detection based on High Volumes of perceived leakage o % Based Performance Indicator Large Industry left % Loss Problem Initial Assessment: o High Pressure = High UARL = ILI of 2.1 Validation Efforts: o Level 1 Audit Next Steps: o M36 Methodology based tracking & metrics o Finished Meter Testing o Large Meter Testing Program o Leak Detection Optimization

13 o Preliminary Bottom-up Analysis Validation Efforts: o Level 1 Audit Next Steps: o M36 Methodology based

14 System #3 - Kentucky Existing Programs: o Leak Detection based on High Volumes of perceived leakage o % Based Performance Indicator o Finished Meter Testing o Master Meter Testing Initial Assessment: o Unrealistic ILI of 13 o Preliminary Bottom-up Analysis Validation Efforts: o Level 1 Audit Next Steps: o M36 Methodology based tracking & metrics o Billed Metered Level 2 Validation o Large Meter Testing Program o Leak Detection Optimization

System #4 - Indiana Existing Programs: o Leak Detection o Customer Meter Testing o Rolling 12 month auditing Initial Assessment: o % Metric used as Indicator Validation Efforts: o Level 1 Audit o

15 System #4 - Indiana Existing Programs: o Leak Detection o Customer Meter Testing o Rolling 12 month auditing Initial Assessment: o % Metric used as Indicator Validation Efforts: o Level 1 Audit o Customer Meter Inaccuracy Analysis o Billing Data Analysis Next Steps: o Large Meter Testing Optimization o Redistricting/Pressure Reduction o Leak Detection Optimization o Unmetered Fire Line Analysis o Small Meter Testing Analysis

System #5 North Carolina Existing Programs: o Capital based line replacement Initial Assessment: o High Pressure = High UARL Validation Efforts: o Level 1 Audits o Billing Data Analysis o Real Loss

16 System #5 North Carolina Existing Programs: o Capital based line replacement Initial Assessment: o High Pressure = High UARL Validation Efforts: o Level 1 Audits o Billing Data Analysis o Real Loss Component Analysis o Lag-time adjustment (bi-monthly billing) Next Steps: o Large Meter Testing Optimization o Pressure Optimization o District Metered Areas o Leak Detection Optimization o Finished Meter Testing

18 A Non-Revenue Tale of Five Cities Tory Wagoner, PE/PLS Cavanaugh & Associates, P.A. 4/25/2017

A Non-Revenue Water Tale of Five Cities

A Non-Revenue Water Tale of Five Cities A Non-Revenue Tale of Five Cities Tory Wagoner, PE/PLS Cavanaugh & Associates, P.A. tory.wagoner@cavanaughsolutions.com 12/5/2017 IWA/AWWA Standard Balance Own Sources Imported Total System Input ( allow