Perth
6.1 Groundwater allocation remaining
Supporting Information
This line item refers to all groundwater supply in the Perth region not related to urban water systems or irrigation schemes. It includes water supply to individual users in the agricultural, industrial and commercial sectors.
The volume recognised in the Statement of water assets and water liabilities (159,413 ML) represents the volume of groundwater allocation remaining for these licence entitlements at the end of the 2010–11 year.
Quantification Approach
Data Source
Provided by
Method
The allocation remaining was calculated as shown in the following table.
|
Account |
Volume (ML) |
|
Opening balance (as at 30 June 2010) |
163,083 |
add |
316,423 |
|
less |
287,044 |
|
less |
33,049 |
|
|
Closing balance (as at 30 June 2011) |
159,413 |
The total allocation remaining on 30 June 2011 for private user entitlements is relatively large compared to that for urban water supply (see line item 6.2). This is because there are many private user entitlements within the Perth region that do not have an anniversary date occurring on 30 June (in general, the water management year commences when the licence is issued).
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.
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 |
6.1 Groundwater allocation remaining |
9.1.3.7 Groundwater allocation remaining–other lumped holders |
163,083 |
141,922 |
Prior period error: incorrect dates used when calculating the allocation remaining Change in line item name and number |