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Canberra

                                                                                                   

1.1 Storages — entitlement system

                             

Supporting information   


This line item represents the volume of water held in storages that is used to provide water for licenced entitlements. These storages provided water for licenced allocations held by ACTEW for urban water supply. The volume reported for this line item includes the volume of dead storage.

Specific details of each storage used for this line item are provided in the table below.

Volume of water held in entitlement system storages in the Canberra region

Storage reservoir

Total capacity (ML)

Dead storage volume (ML)

Volume (ML)
30 Jun 2010

Volume (ML)
01 Jul 2009

Percentage full at end of reporting period

Googong Reservoir

119,409

1,674

56,919

51,370

48%

Cotter Reservoir

3,847

9

3,847

2,992

100%

Bendora Reservoir

11,446

96

9,176

8,033

80%

Corin Reservoir

70,787

110

42,814

25,439

60%

Total

205,489

1,889

112,756

87,834

55%

 

Quantification approach   


Data source

Bureau of Meteorology: Water Storages, Australian Water Resources Information System (AWRIS).

 

Data provider

Bureau of Meteorology.

 

Method

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 rating table(s) provided by the managing authority/operator.

The storage volume of individual storages was aggregated to present the total volume for the line item.

 

Uncertainty

Ungraded.

 

Assumptions, approximations and caveats/limitations

  • 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-rating table.