South East Queensland
27.1 Off–channel water storages
The volumetric value for the line item at the end of the 2011–12 year was 59,080 ML.
The off–channel water store has been excluded from the South East Queensland (SEQ) region in the 2012 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||
Total surface area
|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||3,343|
|Total Logan Basin WRP area||473||28||5,838,847||11,678|
|Total Moreton WRP area||1,130||67||20,311,260||40,623|
|Total SEQ region
Note: Data is the same as in 2010–11, because these estimates have not been recalculated and remain the best figures as per Queensland Department of natural Resources and Mines (DNRM).
Queensland Department of Natural Resources and Mines (DNRM): Office of the Water Supply Regulation geographic information system (GIS).
Major off–channel storages were identified and the area estimated using remote sensing with 30 m pixels. Only storages that are referable under the Water Act 2000 (Qld) 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 SEQ region.
The uncertainty estimate was not quantified.