South East Queensland
27.1 Off-channel water storages
Supporting information
The volumetric value for the line item at the end of the 2012–13 year was 59,080 ML.
The off-channel water store has been excluded from the South East Queensland (SEQ) region in the 2013 Account; therefore, off-channel water store terms do not appear in the water accounting statements.
The following table shows the estimated volume of water stored in off-channel water storages.
Water resource plan (WRP) area | River system |
Count |
Total surface area |
Volume |
|
Qty |
% |
(m2) |
(ML) |
||
Gold Coast | Coomera River | 93 | 5 | 3,389,647 | 6,779 |
Total Gold Coast WRP area | 93 | 5 | 3,389,647 | 6,779 | |
Logan Basin | Albert River | 102 | 6 | 1,671,718 | 3,344 |
Logan River | 371 | 22 | 4,167,129 | 8,334 | |
Total Logan Basin WRP area | 473 | 28 | 5,838,847 | 11,678 | |
Moreton | Bremer River | 302 | 18 | 4,808,992 | 9,618 |
Brisbane River | 156 | 9 | 2,770,688 | 5,541 | |
Caboolture River | 87 | 5 | 788,129 | 1,576 | |
Lockyer River | 320 | 19 | 7,101,810 | 14,204 | |
Maroochy River | 116 | 7 | 1,884,659 | 3,769 | |
North Pine | 53 | 3 | 1,611,937 | 3,224 | |
South Pine | 19 | 1 | 544,028 | 1,088 | |
Stanley River | 77 | 5 | 801,017 | 1,603 | |
Total Moreton WRP area | 1,130 | 67 | 20,311,260 | 40,623 | |
Total SEQ region |
1,696 | 100 | 29,539,754 | 59,080 |
Quantification approach
Data source
Department of Environment and Resource Management (DERM): GIS layer and DERM systems.
Provided by
Method
Major off-channel storages were identified and the area estimated using remote sensing with 30 m pixels. Only storages that are referable under the Queensland Water Act 2000 have been ground inspected and their existence confirmed.
The following criteria were used to classify a body of surface water as off-channel storage:
- the water body must have a surface area greater than approximately 0.25 ha
- the storage must be human-made.
Ring tanks (turkey nest dams) that meet the above criteria were included in the classification. Ring tanks are above ground water storages where all sides of the storage are man-made embankments.
The following criteria were used to estimate the volume in off-channel storages:
- assumed depth of 2 m for each storage
- assumed GIS attribute F_area was in square metres.
Assumptions, limitations, caveats and approximations
Some dams may have been omitted during this selection process due to the 30 m pixels used in the remote sensing.
This data is not intended as a complete count of off-channel storages but is an indication of the number of larger dams within each of the South East Queensland (SEQ) region.
Uncertainty information
The uncertainty estimate was not quantified.