Perth
20.12 Decrease of irrigation scheme claim on surface water

Supporting Information

This line item refers to the total forfeiture of water allocations for the major surface water storages that supply water to the irrigation scheme.

Quantification Approach

Data Source

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

Provided by

Department of Water.

Method

The portion of surface water allocation that has not been abstracted at the end of the 2010–11 year is forfeited. That is, there is no carryover of entitlements into next year's account.

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

 

Total forfeiture of surface water allocation for the irrigation scheme during the 2010–11 year

 

 

Volume (ML)

 

21.3 Allocation announcement

33,620

less

17.13 Allocation diversion

32,952

 

Forfeiture on 30 June 2011

668

 

Assumptions, Limitations, Caveats and Approximations

Nil.

Uncertainty Information

The uncertainty estimate was not quantified.

Comparative year

The following table presents substantive changes in the line item reported in this 2011 Account with the corresponding line item in the 2010 Account.

 

Comparative year information for line item 20.12

2011 Account line item

2010 Account line item

2011 Account volume for the 2009–10 year (ML)

2010 Account volume for the 2009–10 year (ML)

Change from the 2010 Account to the 2011 Account

20.12 Decrease of irrigation scheme claim on surface water

24.12 Non-physical water distribution system decreases–other lumped

12,805

12,805

Change in line item name and number