Definition:
Discrepancy between water flows leaving the works and the total sum of all water received by the consumers; although mainly leakages, it include significant metering errors and unknown/illegal diversions. This concept is more commonly used for the drinking water sector.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
Stephen Merett, 1997, Introduction into the Economics of Water Resources, an International Perspective, UCL Press