The volume recognised in the Statement of Water Assets and Water Liabilities represents the volume of groundwater allocation remaining for urban supply licence entitlements at the end of the reporting period (30 June 2010).
Western Australian Department of Water: Water Resource Licensing database.
Western Australian Department of Water.
For all but one of the 10 bore fields within the Perth region, 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 groundwater supply licence for the Gingin bore field has a water management year that ends on 30 September. Therefore, the allocation remaining at the end of the reporting period (30 June 2010) for the Perth region is the unused component of the annual allocation for the Gingin bore field.
The allocation remaining was calculated as shown in the table below.
|
|
Gingin account |
Volume (ML) |
|---|---|---|
|
|
Opening balance (as at 1 July 2009) |
230 |
|
add |
Allocation announcement |
230 |
|
less |
Abstraction up to 30 June 2010 |
0 |
|
less |
Forfeiture (on 30 Sept 2009) |
230 |
|
|
Closing balance (as at 30 June 2010) |
230 |
Ungraded.
Nil.