Perth
3.7 Urban claim on surface water

Supporting Information

This line item represents the volume of surface water allocation remaining for urban water supply licence entitlements at the end of the 2010–11 year.

Quantification Approach

Data Source

Department of Water: Water Resource Licensing database and licensee meter readings.

Provided by

Department of Water.

Method

For all but one of the 14 surface water urban supply licences, the licensed water management year is from 1 July to 30 June. For these licences, any unused allocation at the end of the water management year is forfeited and, therefore, the allocation remaining at the end of the reporting period is zero.

The water supply licence for Dwellingup has a water management year that ends on 30 September. Therefore, the allocation remaining at the end of the 2010–11 year for the Perth region is the unused component of the annual allocation for the Dwellingup water resource.

The allocation remaining was calculated as shown in the following table.


Volume of surface water allocation remaining for the urban water system at the start and end of the 2010–11 year

 

Dwellingup account

Volume (ML)

 

Opening balance (as at 30 June 2010)

102

add

Allocation announcement (on 1 Oct 2010)

167

less

Abstraction up to 30 June 2011

60

less

Forfeiture (on 30 Sept 2010)

90

 

Closing balance (as at 30 June 2011)

119

 

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 3.7

2011 Account line item

2010 Account line item

2011 Account volume at 30 June 2010 (ML)

2010 Account volume at 30 June 2010 (ML)

Change from the 2010 Account to the 2011 Account

3.7 Urban claim on surface water

7.12 Allocation from connected surface water on regulated flows remaining–urban holder

102

102

Change in line item name and number