Perth
4.6 Irrigation scheme claim on groundwater

Supporting Information

This line item represents the volume of groundwater allocation remaining for irrigation 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

There is one groundwater irrigation scheme supply licence within the Perth region (Chittering Valley). The water supply licence for the Chittering Valley Irrigation Scheme has a water management year that ends on 1 August. Therefore, the allocation remaining at the end of the 2010–11 year for the Perth region is the unused component of the annual allocation.

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


Volume of groundwater allocation remaining for the irrigation scheme at the start and end of the 2010–11 year

 

Account

Volume (ML)

 

Opening balance (as at 30 June 2010)

652

add

22.3 Groundwater allocation announcement

652

less

18.13 Groundwater allocation extraction

0

less

14.3 Adjustment and forfeiture of groundwater allocation

652

 

Closing balance (as at 30 June 2011)

652

 

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 4.6

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

4.6 Irrigation scheme claim on groundwater

7.15 Non-physical water distribution asset–other lumped

652

54

Volume restated due to subsequent availability of information from the licence holder (refer to line item 12.10)

Change in line item name and number