17.5 Overbank flood spilling
The volumetric value for the line item for the 2011–12 year was 299,151 ML. The line item represents flood waters that have overflowed the river channel top of bank (includes flood water to flood plains but excludes flood waters to seasonally connected wetlands and other surface water stores).
The following table summarises the information for the line item for the Murray–Darling Basin (MDB) region.
|Surface water resource plan area||
Sustainable diversion limit area
Volume (ML) for the 2011–12 year
|SW16 Qld Border Rivers||SS24||Qld Border Rivers||Qld||32,000|
|Sub-total Northern Basin||299,151|
|Total for the region||299,151|
Overbank flood spilling is classified as an unregulated event. The line item is applicable to several jurisdictions within the region. However, volumes for this line item were only available for Queensland. Therefore, line item information applies only to the Northern Basin of the region. The volumes shown in the above table have been classified under the unsupplemented entitlement class within Queensland.No information was available for the other water resource plan areas for this line item.
Murray–Darling Basin Authority: Water audit monitoring (WAM) data received from Queensland (4 February 2013) and stored in the HYDRO database.
Bureau of Meteorology (the Bureau).
Assumptions, limitations, caveats and approximations
- Information on all flood waters that have overflowed from the river channels was not available.
- In the reported volume for the line item, it is possible that whole volume may not be from overflows from river channels because it was not possible to distinguish between harvesting from landscape and river overflows.