South East Queensland

                                                                                                   

1.1 Storages—entitlement system

                             

Supporting information   


This line item represents the volume of water held in storages that are used to administer water against entitlements. The volume reported for this line item includes the volume of dead storage. Storages managed by Seqwater have no dead storage due to the installation of pump systems enabling access to the entire stored volume.

The volume provided is the sum of the volumes held in the storages in the South East Queensland (SEQ) region. Specific details of individual storages are provided in the table below.

Storage volumes within the South East Queensland region
Water Resource Plan (WRP) area Water Supply Scheme (WSS) Storage Name Total Storage Capacity1 (ML) Dead Storage Capacity1 (ML) 30 Jun 2010 (ML) 01 Jul 2009 (ML) Change in storage (ML)
Gold Coast Nerang Advancetown Lake (Hinze Dam) 161,073 0 156,098 169,647 -13,549
Little Nerang Dam 6,705 0 5,237 6,741 -1,504
Total 167,778 0 161,335 176,388 -15,053
Logan Basin Logan River Bromelton off-stream storage2,3 8,210 0 8,192 8,600 -408
Cedar Grove Weir2,3 1,144 0 1,174 1,204 -30
Lake Maroon 44,319 0 39,492 37,680 1,812
None Tingalpa Reservoir (Leslie Harrison Dam) 24,868 0 23,519 24,948 -1,429
Total 78,541 0 72,377 72,432 -55
Moreton Central Brisbane and Stanley Mount Crosby Weir4,5 3,430 0 2,200 2,200 0
Lake Wivenhoe 1,165,238 0 1,094,879 783,659 311,220
Lake Somerset 379,849 0 379,016 350,483 28,533
Central Lockyer Lake Clarendon 24,276 0 4,788 1,662 3,126
Lake Dyer (Bill Gunn Dam) 6,947 0 2,799 1,365 1,434
Cressbrook Creek Lake Cressbrook2 81,842 1,136 13,896 6,881 7,015
Lake Perseverance 30,140 3,472 7,285 3,963 3,322
Lower Lockyer Lake Atkinson (Atkinson Dam) 30,400 0 25,398 18,937 6,461
Pine Valley Lake Samsonvale (North Pine Dam) 214,302 0 207,483 214,959 -7,476
Warrill Valley Lake Moogerah 86,290 0 53,185 41,377 11,808
None Enoggera Reservoir 4,567 0 4,541 4,634 -93
Gold Creek Reservoir 1,436 0 785 1,420 -635
Lake Kurwongbah (Sideling Creek Dam) 14,370 0 13,018 14,370 -1,352
Lake Manchester (Cabbage Tree Creek Dam) 25,951 0 25,626 26,508 -882
Splityard Creek Dam5 28,700 6,400 22,300 22,300 0
Total 2,097,738 11,008 1,857,199 1,494,718 362,481
Total SEQ region 2,344,057 11,008 2,090,911 1,743,538 347,373

Table notes:

  1. Total storage capacity obtained from Bureau of Meteorology (water storages) and does not include flood mitigation capacity. All reservoirs managed or owned by Seqwater have zero dead storage specified; Seqwater advises that due to the installation of pumping systems all water is now extractable, so that none of its reservoirs have any dead storage. All other reservoir dead storage obtained from Queensland Department of Environment and Resource Management
  2. Total storage capacity obtained from Queensland Department of Environment and Resource Management
  3. Storage volume provided by Queensland Department of Environment and Resource Management for 30 June 2009 and 30 June 2010
  4. Mount Crosby Weir assumed to be 2200 ML at the start and end of the reporting period as the volume is maintained by releases from Lake Wivenhoe
  5. Total storage capacity obtained from Seqwater
  6. Beaudesert Weir was not included in the water accounting statements as information was not available on storage volumes

 

Quantification approach   


Data source

Bureau of Meteorology, water storages.

 

Data provider

Bureau of Meteorology.

 

Method

Storage volume was calculated at the start and end of the reporting period from measured 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 storage manager.

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

 

Uncertainty

Ungraded.

 

Approximations, assumptions, caveats and limitations

  • Storage-volume (rating) tables are constructed from 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 affect the accuracy of the storage rating tables.