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Reports on water companies
International comparisons - water balance Figure 6 shows the components of the water balance used by the companies in England and Wales. Distribution input should be equal to all the components of the water balance. Distribution input will be affected by:
Although it is relatively straightforward to measure the distribution input, different definitions for water balance components (such as distribution losses, supply pipe leakage and customer use) can make direct comparisons difficult. In addition, if there is a large number of customers without meters (as in England and Wales), several components have to be estimated. In countries with widespread metering only one component is estimated, usually leakage. However, inaccuracies in other areas (meter under-registration or supply pipe leakage) may accumulate in this leakage estimate. The assumptions we make when estimating components of the water balance can significantly influence comparisons such as unit costs where these are based on volume (p/m3). The International Water Association (IWA) has sought for a number of years to overcome the problem of different measures and definitions by developing and promoting a standard water balance similar to that used in England and Wales. A number of countries continue to adopt this work. We hope this will make more robust data available and allow more meaningful comparisons in the future.  |
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Water balance |
Water balance - results for 2006-07
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