14.2 Adjustment and forfeiture of groundwater allocation – urban water system
The volume recognised in the water accounting statements (898 ML) represents the total forfeiture of water allocations for urban groundwater entitlements in the Ord region during the 2011–12 year.
The urban water supply licences relate to groundwater extraction from local bore fields for:
- Kununurra town supply
- Halls Creek town supply.
The portion of groundwater allocation that has not been abstracted at the end of the 2011–12 year is forfeited, i.e. there is no carry-over of entitlements into next year's account.
The water supply licences for Kununurra and Halls Creek town supply have a water management year that ends on 31 March. Therefore, the forfeiture reported for both urban licences are calculated as the total annual allocation minus the total allocation extraction between 1 April 2011 and 31 March 2012.
Total forfeiture for both urban water supply licences is the forfeiture reported on 31 March 2012.
Assumptions, limitations, caveats and approximations
Forfeiture is calculated based on available extraction data. Where the extraction data are estimated, the forfeiture is subject to the same assumptions and limitations of the extraction data (refer to line item 18.12).
The uncertainty estimate was not quantified.