Systematic Municipal Water Use Accounting and GPCD Calculations John W. Longworth, P.E. -- Chief Water Use and Conservation Bureau NM Office of the State.

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Presentation transcript:

Systematic Municipal Water Use Accounting and GPCD Calculations John W. Longworth, P.E. -- Chief Water Use and Conservation Bureau NM Office of the State Engineer

Background To provide standardization for administrative review –40-Year Water Planning –Water Conservation Plans –Permitting Requirements Two considerations –System –End user

AWWA Standards for Water System Audits –1991 “ Unaccounted for Water ” –2000IWA/AWWA Water Balance Provides consistent terminology Water Use Accounting nothing left “ unaccounted for ” Meaningful Assessment of Revenue and Non-Revenue Water System focus Water Use Accounting

System Input Volume (corrected for known errors) Authorized Consumption Billed Authorized Consumption Billed Metered Consumption (including water exported) Revenue Water Billed Unmetered Consumption Unbilled Authorized Consumption Unbilled Metered Consumption Non- Revenue Water (NRW) Unbilled Unmetered Consumption Water Losses Apparent Losses Unauthorized Consumption Customer Metering Inaccuracies Data Handling Errors Real Losses Leakage on Transmission and Distribution Mains Leakage and Overflows at Utility's Storage Tanks Leakage on Service Connections up to point of Customer metering AWWA Water Loss Accounting

Water Losses Non Revenue Water Apparent Losses Meter Inaccuracies Data Handling Errors Unauthorized Consumption Real Losses Leaks in Distribution Overflows at Storage Tank Water Treatment Plant Ground water Surface Water

Authorized Consumption Billed/Revenue Water Billed Unmetered Estimates Flat rates Billed Metered By Sector SF Residential MF Residential Commercial Institutional Water Treatment Plant Ground water Surface Water

Authorized Consumption Unbilled/Non Revenue Water Unbilled Metered City Parks/Pools City Buildings Unbilled Unmetered Fire Fighting Street Cleaning Line Flushing Water Treatment Plant Ground water Surface Water

System Input Volume (corrected for known errors) Authorized Consumption Billed Authorized Consumption Billed Metered Consumption (including water exported) Revenue Water Billed Unmetered Consumption Unbilled Authorized Consumption Unbilled Metered Consumption Non- Revenue Water (NRW) Unbilled Unmetered Consumption Water Losses Apparent Losses Unauthorized Consumption Customer Metering Inaccuracies Data Handling Errors Real Losses Leakage on Transmission and Distribution Mains Leakage and Overflows at Utility's Storage Tanks Leakage on Service Connections up to point of Customer metering AWWA Water Loss Accounting

NM Water Use Accounting Pilot Projects Gallup Ruidoso online at Las Vegas Rio Rancho – results pending It provides detailed understanding of where all the water is going.

GPCD Calculations Researched other state ’ s approaches Proposed methodology –Obtained outside peer review End users measure

GPCD Research States implementing standardized GPCD –Kansas, Arizona, Texas and Florida All States had unique methodology –Similarities Diversion over population –Differences Adjustments to diversions –Concerns Populations calculation Difficult to compare -- System

NMOSE Proposed Methodology More than one “ GPCD ” necessary to paint comparable picture –Total System –Residential Population calculated by: –Persons per household from US Census Bureau –Single family residential connections –Multifamily units –Vacancy rate from US Census Bureau Monthly or seasonal averages helpful for conservation assessment

NMOSE Proposed Methodology Residential GPCD = total residential billed/ residential population Total System = total production/ (residential population + multifamily population) Difference between total system and residential = ICI and system losses –Considering these as separate indicators

Implementation NMOSE is currently: Evaluating the research, peer reviews and pilot projects Evaluating the benefits of a potential pilot of the GPCD methodology Considering all options for implementation of both the water use accounting and GPCD methodologies

Questions? Contact information: John Longworth