Canberra
3.1 Urban water supply system
Supporting information
The volume reported in the water accounting statements is 953 ML which is the volume of water held in potable and non-potable water supply system on 30 June 2013. There are 47 tanks (service reservoirs) within ACTEW's supply system and approximately 3,140 km of pipes. The QCC water supply system is much smaller in size than the ACTEW system.
This volume is expected to remain relatively constant each year, with slight increases in pipe network volume due to the expansion of the network, and slight changes in the tank (service reservoir) volumes due to operational level changes.
| Urban water supply system | Storage volume on 30 June 2013 | Storage volume on 30 June 2012 | ||
| ACTEW (ML) | Queanbeyan City Council (ML) | ACTEW (ML) | Queanbeyan City Council (ML) | |
| Pipes | 274 | 8 | 274 | – |
| Tanks | 615 | 56 | 630 | – |
| Subtotal | 889 | 64 | 904 | – |
| Total | 953 | 904 | ||
Quantification approach
ACTEW Water
Data source
Provided by
Method
The volume in the tanks (service reservoirs) was reported as the volume at 8 am 1 July 2012 and 1 July 2013. The volume in the pipe network was calculated based on the pipe lengths and nominal internal pipe diameters as recorded in the GIS database. This includes both non-potable and potable water pipes.
Assumptions, limitations, caveats and approximations
It was assumed that all the pipes were full on 30 June 2013.
Uncertainty information
Data are measured; uncertainty is estimated at +/– 10%.