Perth
13.4 Adjustment and forfeiture of inter-region commitment on surface water

Supporting information

The volume recognised in the water accounting statements (11,077 ML) represents the total forfeiture of surface water allocations for water supply to the Kalgoorlie Goldfields and Agricultural region, located outside of the Perth region, during the 2012–13 year.

Quantification approach

Data source

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

Provided by

Department of Water; Water Corporation.

Method

The portion of surface water allocation for Mundaring Reservoir (which supplies water to the Kalgoorlie Goldfields and Agricultural region) that has not been abstracted at the end of the year is forfeited; that is, there is no carry-over of entitlements into next year's account.

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

 

Total forfeiture of the inter-region commitment on surface water for the 2012–13 year

 

Account

Volume (ML)

 

21.4 Increase of inter-region commitment on surface water

36,300

less

17.14 Surface water transfer under inter-region commitment

25,223

 

Forfeiture on 30 June 2013

11,077

 

Assumptions, limitations, caveats and approximations

Nil.

Uncertainty information

The uncertainty estimate was not quantified.