Perth
14.1 Adjustment and forfeiture of groundwater allocation

Supporting Information

This line item refers to total forfeiture of groundwater allocations for all groundwater 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 groundwater licence purpose for the 2010–11 year is given in the following table.

 

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

Licence category

Terminated licences (ML)

Agriculture

10,691

Commercial and institutional

 3,060

Environment and conservation

 169

Industry and power generation

 3,530

Mining

 358

Parks, gardens and recreation

 10,541

Stock and domestic

 4,167

Other

 533

Total

 33,049

 

Quantification Approach

Data Source

Department of Water: Water Resource Licensing database.

Provided by

Department of Water.

Method

The portion of groundwater allocation that has not been extracted 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 extraction is estimated to be the full allocation (see line item 18.11), 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 extraction data are estimated, the forfeiture is subject to the same assumptions and limitations of the extraction data (refer to line item 18.11).

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 14.1

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

14.1 Adjustment and forfeiture of groundwater allocation

28.1.3.7 Adjustment and forfeiture of groundwater allocation–other lumped holders

7,641

7,641

Change in line item name and number