4.7 Residential Shows the average water consumption of groups Consumption of people 4.8 Residential Consumption connections to mains – supply 4.9Residential consumption - public water points B.2 Discussion Theoretically the water consumption indicator is expressed in terms of litres/person/day. “best” However there are data problems. Particularly: lack of accurate total consumption data (for example from universal metering) poor quality, or out of date, census data While the accuracy of service populations may need improvement, utilities are often more confident in the number of connections in their system. In addition water production figures may be known more reliably than those for water consumption. To draw on these other sources of (potentially) more reliable data a number of indicators have been included. These will allow trending analyses to be undertaken within a utility. Inter utility comparisons will be more difficult, however, given the different mix of household sizes and dwellings served by one connection. This is especially the case between utilities in different countries. Homogeneity of household size, and dwellings per connection, within a country will allow informed in-country comparisons to be made. C. Non Revenue Water C.1 Indicators INDICATOR UNIT CONCEPT Non Revenue Water % Difference between water supplied and water sold m3/km/day expressed as a percentage of net water supplied; Non Revenue Water m3/conn/day as volume of water per km of water Non Revenue Water “lost” distribution network per day; and volume of water per water connection per day. “lost” C.2 Discussion Non revenue water represents water that has been produced and is before it reaches the “lost” customer (either through leaks, through theft, or through legal usage for which no payment is made). Part of this can be saved by appropriate technical and managerial actions. It can then be used to meet currently unsatisfied demand (and hence increase revenues to the utility), or to defer future capital expenditures to provide additional supply (and hence reduce costs to the utility).
4.7 Residential Consumption 4.8 Residential Consumption – connections to mains supply 4.9Residential consumption - public water points Shows the average water consumption of groups of people B.2 Discussion Theoretically the “best” water consumption indicator is expressed in terms of litres/person/day. However there are data problems. Particularly: lack of accurate total consumption data (for example from universal metering) poor quality, or out of date, census data While the accuracy of service populations may need improvement, utilities are often more confident in the number of connections in their system. In addition water production figures may be known more reliably than those for water consumption. To draw on these other sources of (potentially) more reliable data a number of indicators have been included. These will allow trending analyses to be undertaken within a utility. Inter utility comparisons will be more difficult, however, given the different mix of household sizes and dwellings served by one connection. This is especially the case between utilities in different countries. Homogeneity of household size, and dwellings per connection, within a country will allow informed in-country comparisons to be made. C. Non Revenue Water C.1 Indicators INDICATOR UNIT CONCEPT Non Revenue Water Non Revenue Water Non Revenue Water % m3/km/day m3/conn/day Difference between water supplied and water sold expressed as a percentage of net water supplied; as volume of water “lost” per km of water distribution network per day; and volume of water “lost” per water connection per day. C.2 Discussion Non revenue water represents water that has been produced and is “lost” before it reaches the customer (either through leaks, through theft, or through legal usage for which no payment is made). Part of this can be saved by appropriate technical and managerial actions. It can then be used to meet currently unsatisfied demand (and hence increase revenues to the utility), or to defer future capital expenditures to provide additional supply (and hence reduce costs to the utility).
IBNET%20indicator%20definitions%20-%202017.docx