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Adelaide

                                                                                                   

1.1 Storages—entitlement system

                             

Supporting information   


The value reported in the water accounting statement (110,546 ML) represents the volume of water held in reservoirs and weirs operated by SA Water as at 30 June 2010. The volume reported for this line item includes dead storage (volume below the lowest outlet, which cannot be accessed under normal operating conditions). The volume in each storage at 1 July 2009 and 30 June 2010, as well as the capacity and dead storage, are provided in the table below.

 
Reservoir Total storage capacity (ML) Dead storage capacity (ML) Storage at 1 July 2009(ML) Storage at30 June 2010 (ML)
Barossa Reservoir 4,510 19 4,232 4,268
Barossa Weir 200 0 91 93
Clarendon Weir 320 2 268 204
Gorge Weir 24 0 20 11
Gumeracha Weir 200 0 199 129
Happy Valley Reservoir 12,700 71 9,234 10,100
Hope Valley Reservoir 2,764 123 2,105 2,257
Kangaroo Creek Reservoir 19,000 300 4,251 5,814
Little Para Reservoir 20,800 188 13,174 3,833
Millbrook Reservoir 16,500 188 13,053 14,873
Mount Bold Reservoir 45,900 27 24,378 16,703
Myponga Reservoir 26,800 163 13,981 17,451
Onkaparinga Summit Reservoir 427 64 204 168
South Para Reservoir 44,800 310 19,459 31,466
Warren Reservoir 4,770 0 4,842 3,176
Total 199,715 1455 109,491 110,546

The volume in each major storage (individual capacity > 1 GL) at 1 July 2009 and 30 June 2010 is compared to the capacity in the figure below. The percentage full for major storages at 30 June 2010 ranged from 18% for Little Para Reservoir to 95% for Barossa Reservoir. The percentage full exceeded 60% for most major storages.

Graph of the capacity and volume at 1 July 2009 and 30 June 2010 for major storages in the Adelaide region 

Graph of the capacity and volume at 1 July 2009 and 30 June 2010 for major storages in the Adelaide region

 

Quantification approach   


Data source

Bureau of Meteorology: Water Storages.

 

Data provider

Bureau of Meteorology.

 

Method

Storage volume was measured at 1 July 2009 and 30 June 2010 by using gauged water-level heights (mAHD) for individual storages. The height measurement was converted to a volume using the storage rating tables provided by SA Water.
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 affects the accuracy of the storage rating table.