Perth
13.4 Adjustment and forfeiture of inter-region commitment on surface water
Supporting Information
This line item refers to the total forfeiture of water allocations for Helena River (Mundaring Reservoir), which supplies water to the Kalgoorlie Goldfields, located outside of the Perth region.
Quantification Approach
Data Source
Provided by
Method
The portion of surface water allocation for Helena River (which supplies water to the Kalgoorlie Goldfields and Agricultural region) 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 for Helena River minus the total allocation diversion, as shown in the following table.
|
|
Volume (ML) |
|
36,300 |
|
less |
25,851 |
|
|
Forfeiture on 30 June 2011 |
10,449 |
Assumptions, Limitations, Caveats and Approximations
Uncertainty Information
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.
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 |
13.4 Adjustment and forfeiture of inter-region commitment on surface water |
26.5 Other lumped surface water liability decreases |
9,642 |
9,642 |
Change in line item name and number |