19.20 Other urban water system decreases
a. Urban water supply system overview
The urban water supply system is one of three sub-components of Canberra's urban water system. The three sub-components are the:
- Urban water supply system
- Wastewater system
- Recycled water system.
Surface water (11.12) is the main source of water for Canberra's urban water supply system.
Urban water consumption (part of 19.4) is recorded as 38,852 ML during the 2011–12 year, representing 93% of all urban water supply system outflows. The remaining urban water was lost through operational losses.
The following figure shows all the inflows and outflows associated with the urban water supply system. For more detail on a particular flow associated with the urban water supply system, refer to the line item notes.
Schematic diagram of water inflows and outflows during the 2011–12 year for Canberra's urban water supply system. Line item numbers are provided in brackets.
b. Supporting information
The volume presented in the water accounting statements (780 ML) represents the part of the volume of non-revenue water from retail water authorities in the Canberra region during the 2011–12 year. This volume is the estimated customer meter under registration, unauthorised consumption, unbilled unmetered consumption and metered unbilled consumption.
The volume does not include leakage to groundwater or losses to the landscape, including pipe bursts from potable water supplies.
|Water authority||Volume (ML)|
Assumptions, limitations, caveats and approximations