20.13 Adjustment and forfeiture of irrigation scheme claim on groundwater

Supporting information

This line item volume (652 ML) represents the total forfeiture of groundwater allocations for the irrigation scheme in the Perth region during the 2011–12 year.

Quantification approach

Data source

Water Resource Licensing database and licensee meter readings.

Provided by

Department of Water.


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 forfeiture is calculated as the total annual allocation less total allocation diversion, as shown in the following table.


Total forfeiture of groundwater allocation for the irrigation scheme during the 2011–12 year



Volume (ML)


22.3 Groundwater allocation announcement



18.13 Allocated groundwater extraction



Forfeiture on 30 June 2012



Assumptions, limitations, caveats and approximations


Uncertainty information

The uncertainty estimate was not quantified.

Comparative year

This line item corresponds to line item '20.13 Decrease of irrigation scheme claim on groundwater' reported in the 2011 Account.