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 water accounting statements (150,225 ML) represents the volume of groundwater allocation remaining for these licence entitlements at the end of the 2011–12 year.
Quantification approach
Data source
Provided by
Method
The allocation remaining at 30 June 2012 was calculated as shown in the following table.
|
Account |
Volume (ML) |
|
Opening balance (at 30 June 2011) |
159,413 |
add |
298,251 |
|
less |
289,305 |
|
less |
18,134 |
|
|
Closing balance (at 30 June 2011) |
150,225 |
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 2012 is relatively high (more than 50% of the allocation announcement).
Assumptions, limitations, caveats and approximations
Nil.
Uncertainty information
The uncertainty estimate was not quantified.