Canberra
10.6 Leakage from urban water system

This line item volume is 2,803 ML that represents the total leakage from the urban water supply system to the groundwater system. These losses include pipe bursts and background leakage from pipes, service reservoirs and service connections prior to the customer water meters in the Canberra region. In addition, other remaining losses (non-revenue water) which could not be separated are also included in this line item volume.

The ACTEW Water's real losses were calculated in line with the Water Services Association of Australia (WSSA) National Performance Framework. The losses from the urban water supply network is the difference between the system input volume (SIV) and the total of the billed water exported (supplied to Queanbeyan), billed metered consumption, billed unmetered consumption, unbilled metered consumption, unbilled unmetered consumption, unauthorized consumption and customer meter under-registration.

• Losses from the water supply network cannot be distinguished between the background leakage and losses due to pipe bursts, and therefore a combined estimate is provided.

• This combined volume of losses is presented as leakage to groundwater since leakage to landscape cannot be quantified.

The uncertainty estimate was not quantified.

The total volume of losses represents the combined volume of non-revenue water (pipe bursts, leakage and other losses) from the Queanbeyan potable water supply system.  This is calculated by using the difference between what QCC purchases from ACTEW and what QCC sells to its customers.

• Losses from the water supply system cannot be separated to quantify pipe bursts, background leakage, and other losses, and therefore a combined estimate is provided.
• This combined volume of losses is presented as leakage to groundwater since leakage to landscape cannot be quantified

The uncertainty estimate was not quantified.