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 206,139 ML on 30 June 2012. It includes the dead storage capacity. Specific details of storages are provided in the following table.
|Water storage name||Total storage capacity (ML)||Dead storage capacity (ML)||30 June 2012 (ML)||30 June 2011 (ML)||Change in storage (ML)|
Storage volume was measured at the start and end of the reporting period by using gauged water level height(s) (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.
The uncertainty estimate was not quantified.