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1.1 Storages—entitlement system

                             

Supporting information   


The volume recognised in the water accounting statements (8,765,207 ML) represents the volume of water held in reservoirs that are used to administer water access entitlements at 30 June 2010. The volume includes the dead storage volume.

Specific details of individual reservoirs are provided in the table below.

 

Reservoir name   Total storage
capacity (ML)		 Dead storage
capacity (ML)		 Volume (ML)
at 30 June 2010		 Volume (ML)
at 1 July 2009
Lake Argyle 10,755,830 324,000 8,668,050 10,502,930
Lake Kununurra 100,825 87,000 95,286 95,098
Moochalabra Dam 2,023 175 1,871 1,759
Total 10,858,678 411,175 8,765,207 10,599,787

 

Quantification approach   


Data source

Water Corporation Operational Data Storage System database.

 

Data provider

Water Corporation.

 

Method

Storage volume is calculated at the start and end of the reporting period by using gauged water level height(s) (metres above Australian Height Datum [mAHD]) for individual reservoirs. The height measurement is converted to a volume using the storage–volume curve(s) of the storage.

The storage volume of individual reservoirs is aggregated to present the volume for the line item.

 

Uncertainty

Derived from measured data. Uncertainty range +/–5%.

 

Assumptions, approximations and caveats/limitations

  • Storage–volume curves represent specifically surveyed parts of the reservoir, and may not reflect the storage–volume relationship across the entire storage.
  • Reservoirs are subject to sedimentation and other physical changes over time, which in turn affects the accuracy of the storage–volume curves.