Transcription of 1 PI of Water Losses in the Distribution System 2008
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1 PI of Water Losses in the Distribution System 2008
Water Losses in the Distribution System1 Performance Indicators of Water Losses in Distribution SystemSaroj SharmaApril 2008 Delft, The Netherlands2 IntroductionWater Losses in the Distribution System23 Step 1: Analysis of network characteristics and operating practices Step 2: Use appropriate tools and mechanisms to suggest appropriate solutionsUnderstanding and Managing Losses in Water Distribution Networks4 Components of Water LossWater LossPhysical loss (Real loss)Commercial loss(Apparent loss)Pipe breaks and leaksStorage overflowsHouse connection leaksMetering ErrorsWater TheftBilling AnomaliesWater Losses in the Distribution System35 Billed Metered Consumption (including Water exported) Billed Authorised Consumption Billed Unmetered consumption Revenue Water Unbilled Metered Consumption Authorised Consumption Unbilled Authorised Consumptiion Unbilled Unmetered Consumption Unauthorised Consumption Apparent Losses Metering Inaccuracies Leakage on Transmission and/or Distribution Mains Leakage and Overflows at Utility s Storage Tank System Input Volume Water Losses Real Losses Leakage on Service Connections up to point of Customer Metering Non- Revenue Water All quantities in m3/year Standard TerminologiesSource:IWA (2000)6 What is Unaccounted-For- Water ?
Infrastructure element Estimated leakage level Low Average High • Distribution mains (l/km/h) 20.0 40.0 60.0 • Average for all metered service pipes: - meter at property boundary (l/connection/h) 1.50 3.00 4.50 - meter in-house (l/connection/h) 1.75 3.50 5.25 • In house plumbing losses
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