The yield of a distribution network represents one of the indicators most commonly used by water distributors to account for the state of the volumes of losses over a given period or to measure the evolution of these losses from one year to the next, generally speaking. However, contrary to what might be thought, complex situations and very differing interpretations are to be found on the back of the result of the calculation of the volumes of water lost in the distribution network. A study of drinking water network yield was carried out in Paris in 2001 so as to get a better grasp of the developments recorded since 1987. The consequences of the changes that have taken place during this period have each been measured: alterations to the organisation of the water system, developments affecting the structure of the supply system, technical improvements in the wholesale water metering systems and overall reduction in volumes consumed.

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