Canberra
1.1 Storages
Supporting information
This line item represents the volume of water held in storages that is used to administer water against entitlements in the Canberra region.
The volume held in the storages in the Canberra region is recorded as 181,290 ML on 30 June 2013. It includes the dead storage capacity. Due to the enlargement of Cotter Reservoir during 2012–13 year, total capacity of the reservoir increased from 3,865 ML to 79,375 ML and dead storage increased from 9 ML to 3,178 ML. As capacity has recently been increased, storage level is slightly above the previous capacity as of 30 June 2013 while the new capacity fills.
Specific details of storages are provided in the following table. The volumes in the table were updated by ACTEW water during the 2012–13 year.
| Water storage name | Total storage capacity (ML) | Dead storage capacity (ML) | 30 June 2013 (ML) | 30 June 2012 (ML) |
| Bendora | 11,543 | 97 |
8,221 |
9,977 |
| Corin | 70,897 | 110 | 42,448 |
70,909 |
| Cotter | 79,375 | 3,178 |
9,537 |
3,847 |
| Googong | 121,083 | 1,675 |
121,084 |
121,406 |
| Total | 282,898 | 5,060 |
181,290 |
206,139 |
Quantification approach
Data source
Provided by
Method
Storage volume was measured at the start and end of the reporting period by using gauged water level height(s), expressed as metres above Australian height datum (mAHD) for individual storages. The height measurement was converted to a volume using the storage–volume curves provided by the managing authority/operator. The storage volume of individual storages was aggregated to present the total volume for the line item.
Assumptions, limitations, caveats and approximations
- Storage volume curves represent specifically surveyed parts of the water storage and may not reflect the storage volume relationship across the entire storage
- Water storages are subject to sedimentation and other physical changes over time, which in turn affect the accuracy of the storage–volume curves.
Uncertainty information
The uncertainty estimate was not quantified.