Perth
19.18 Adjustment and forfeiture of urban claim on groundwater

This line item volume (13,150 ML) represents the total forfeiture of groundwater allocations for the urban water system in the Perth region during the 2011–12 year.

Department of Water, Water Resource Licensing database; Water Corporation, Operational Data Storage System database.

Department of Water and Water Corporation.

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.

For all the groundwater licences within the Perth region that supply water to the urban water system, the licensed water management year is 1 July to 30 June. The forfeiture that occurs at the end of the 2011–12 year is calculated as the total annual allocation for these groundwater resources less the total allocation diversion.

Total forfeiture also includes the volume of allocation remaining after a licence has been terminated or cancelled. During the 2011–12 year, the groundwater licences for the Gingin bore field were terminated. The allocation remaining for these licences at the termination date were forfeited.

Total forfeiture is calculated as shown in the following table.

Total forfeiture of groundwater allocation for the urban water system during the 2011–12 year

	Account	Volume (ML)
	22.2 Groundwater allocation announcement	170,785
less	18.12 Allocated groundwater extraction	157,789
	Sub-total	12,996
plus	Forfeiture from terminated licences	154
	Total forfeiture on 30 June 2012	13,150

Nil.

The uncertainty estimate was not quantified.

This line item corresponds to line item '19.18 Decrease of urban claim on groundwater' reported in the 2011 Account.