Perth
13.1 Adjustment and forfeiture of surface water allocation

Supporting Information

This line item refers to total forfeiture of water allocations for all surface water supply in the Perth region not related to urban water systems or irrigation schemes.

The water supply licences are divided into licence entitlement purposes. The total volume of terminated licences for each surface water licence purpose for the 2010–11 year is given in the following table.

 

Volume of terminated licences for each surface water licence purpose during the 2010–11 year

Licence category

Terminated licences (ML)

Agriculture

122

Commercial and institutional

 7

Environment and conservation

 0

Industry and power generation

 0

Mining

 0

Parks, gardens and recreation

 0

Stock and domestic

 31

Other

 143

Total

303

 

Quantification Approach

Data Source

Department of Water: Water Resource Licensing database.

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. The forfeiture is calculated as the total annual allocation for each licence minus total allocation diversion. However, given that the volume of abstraction is estimated to be the full allocation (refer to line item 17.11), this component of the forfeiture is assumed to be zero.

Entitlements that are terminated during the 2010–11 year are also considered to be forfeitures.

Assumptions, Limitations, Caveats and Approximations

Given that the abstraction data are estimated, the forfeiture is subject to the same assumptions and limitations of the abstraction data (refer to line item 17.11).

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 13.1

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

13.1 Adjustment and forfeiture of surface water allocation

26.1.9.7 Adjustment and forfeiture of allocation on regulated flows–other lumped holders

517

517

Change in line item name and number