Perth
6.1 Groundwater allocation remaining
Supporting information
The volume recognised in the water accounting statements (124,858 ML) represents the volume of groundwater allocation remaining for individual licence entitlements at the end of the 2012–13 year.
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.
Quantification approach
Data source
Provided by
Method
The allocation remaining at 30 June 2013 was calculated as shown in the following table.
|
Account |
Volume (ML) |
|
Opening balance (at 1 July 2012) |
147,367 |
add |
284,520 |
|
less |
274,546 |
|
less |
32,483 |
|
|
Closing balance (at 30 June 2013) |
124,858 |
Generally, the water management year for private users commences on the date the licence is issued. Consequently, there are a high number of private water users whose licence anniversary falls outside the standard water year (1 July–30 June). As a result, the allocation remaining at 30 June 2013 is relatively high (more than 40% of the allocation announcement).
Assumptions, limitations, caveats and approximations
Nil.
Uncertainty information
The uncertainty estimate was not quantified.
Comparative year
The volume of groundwater allocation remaining for the 2011–12 year has changed from that presented in the 2012 Account. Please refer to Restatement of comparative information in the 'Water accounting policies' for more information.