20.12 Adjustment and forfeiture of irrigation scheme claim on surface water

Supporting information

This line item volume (6,632 ML) represents the total forfeiture of surface water allocations for the irrigation scheme in the Perth region during the 2011–12 year.

The irrigation scheme licences relate to the Harvey and Waroona irrigation districts within the Harvey Water Irrigation Area.

Quantification approach

Data source

Department of Water, Water Resource Licensing database; Harvey Water, Supervisory Control and Data Acquisition system.

Provided by

Department of Water and Harvey Water.


The portion of surface water 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 surface water allocation for the irrigation scheme during the 2011–12 year



Volume (ML)


21.3 Surface water allocation announcement



17.13 Allocated surface water diversion



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 '20.12 Decrease of irrigation scheme claim on surface water' reported in the 2011 Account.