Text Box: NON REVENUE WATER PROJECT Non-Revenue Water (NRW) is the difference between the annual volumes of System Input and Billed Authorised Consumption. Non-Revenue Water (NRW) includes not only the Real and Apparent Losses, but also Unbilled Authorised Consumption. NRW reflects the difference between the volume of water delivered to the distribution system and the water sold by the utility. It includes physical or technical losses such as pipe breaks (leaks) and overflows and commercial losses (meter under-registration, illegal use including fraudulent or unregistered connections and legal, but usually unmetered, uses like fire fighting). NRW is usually expressed in a number of different ways such as: Difference between water supplied and water sold expressed as a percentage of net water supplied (this is the most common form of expression); Difference between water supplied and water sold expressed as a volume of water ‘lost’ per km of water distribution network per day; and Difference between water supplied and water sold expressed as a volume of water ‘lost’ per water connection. Photo: Leaks such as this are a major contributor to high NRW levels The NRW program commenced in 2003 in Port Moresby. To date 30 NRW zones have been created throughout Port Moresby and over 25 Mld of NRW have been saved. Once completed in June 2006, the project is aimed to makes savings of up to 30 Mld covering 35 zones. The savings made by this project have reflected on the production as water production at Mt Eriama Water Treatment Plant has reduced from 165 Mld to now only 145 Mld. Lower production means lower energy and chemical costs.

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