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NON REVENUE WATER - INTERNATIONAL BEST PRACTICE FOR ASSESSMENT, MONITORING AND CONTROL  
NRW_International_Best_Practices_for_Assessement__Monitering_and_Control__2003.pdf
Assessment Study Water utilities Water

The paper describes the IWA approach to developing a NRW strategy, a water balance calculation, and an international measure of performance - the international leakage index (ILI).