Perth
5.4 Inter-region commitment on surface water

Supporting information
Quantification approach

Supporting information

The volume recognised in the water accounting statements (0 ML) represents the volume of surface water allocation remaining for water supply to the Kalgoorlie Goldfields and Agricultural region, located outside of the Perth region boundary, at the end of 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

Water for the Kalgoorlie Goldfields and Agricultural region is diverted from Mundaring Reservoir. The water supply licence for Mundaring Reservoir has a water management year that ends at 30 June. At the end of the water management year, any unused allocation is forfeited. Therefore, the allocation remaining at 30 June 2013 is zero, as shown in the following table.

Volume of inter-region commitment on surface water remaining at the start and end of the 2012–13 year
	Account	Volume (ML)
	Opening balance (at 1 July 2012)	0
add	21.4 Increase of inter-region commitment on surface water	36,300
less	17.14 Surface water transfer under inter-region commitment	25,223
less	13.4 Adjustment and forfeiture of inter-region commitment on surface water	11,077
	Closing balance (at 30 June 2013)	0

Assumptions, limitations, caveats and approximations

Nil.

Uncertainty information

The uncertainty estimate was not quantified.

Perth5.4 Inter-region commitment on surface water