according to IWA guidance , ...
Published by REMI DE LAMMERVILLE, Metering & smart metering at Veolia
according to IWA guidance , Non Revenue Water (NRW) is the volume obtained by deducting Billed Authorized Consumption from system Volume.
Unaccounted For Water (UFW) is the volume obtained by deducting Billed AND UNBILLED Authorized Consumption from system Volume.
UFW is a part of NRW out of Unbilled Authorized Consumption ( like fire hydrants or water used for cleaning the network). In other words, UFW = net production – legitimate consumption.
best regards,