By Julian Thornton
* Addresses each point of water loss and identifies the simplest resolution
* Covers mapping instruments and strategies, leak detection and service, and gear wishes
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All rights reserved. Any use is subject to the Terms of Use as given at the website. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. 10 Annual water audit in International Water Association format. 15% Nonrevenue water cost = $17,109 + $131,882 + $13,750,897 + $2,965,228 = $16,865,116 The nonrevenue cost ratio is the percentage of the annual cost of nonrevenue water over the annual running costs for the water system.
Brown, T. , “A Review of Performance Indicators for Real Losses from Water Supply Systems,” AQUA, December 1999. 7. Lambert, A. , and Trow, S. Managing Water Leakage: Economic and Technical Issues, Financial Times Energy Publications, 1998. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Any use is subject to the Terms of Use as given at the website. 4 IWA-Recommended Performance Indicators for Nonrevenue Water and Water Losses Function Ref. Level Financial: nonrevenue water by volume Fi36 1 (basic) Financial: nonrevenue water by cost Fi37 Inefficiency of use of water resources Performance Indicator Comments Volume of nonrevenue water as percent of system input volume Can be calculated from simple water balance 3 (detailed) Value of nonrevenue water as percent of annual cost of running system Allows different unit costs for NRW components WR1 1 (basic) Real losses as a percent of system input volume Unsuitable for assessing efficiency of management of distribution systems Operational: real losses Op24 1 (basic) Gal/service line/day, when system pressurized Best “traditional” basic performance indicator Operational: real losses Op25 3 (detailed) Infrastructure leakage index Ratio of current annual real losses to unavoidable annual real losses Source: Ref.