Sydney
5.2 Surface water allocation remaining - urban water system
Supporting Information
The volume recognised in the Statement of water assets and water liabilities represents the volume of surface water allocation remaining for licensed entitlements for the major urban utilities at the end of the reporting period.
Quantification Approach
Data Source
Provided by
Method
For each water management licence, the licensed water management year is from 1 July to 30 June. At the end of the water management year, any unused allocation is forfeited. Therefore, the allocation remaining on 30 June 2011 is 0 ML, as shown in the following table.
Calculation |
Line item |
Volume (ML) |
|
Opening balance (as at 1 July 2010) |
0 |
add |
1,022,865 |
|
less |
438,169 |
|
less |
13.2 Adjustment and forfeiture of surface water allocation - urban system |
584,696 |
equals |
Closing balance (as at 30 June 2011) |
0 |
Assumptions, Limitations, Caveats and Approximations
Uncertainty Information
For entitlements – the allocation/claim was derived from the Draft Water Sharing Plan – Greater Metropolitan Unregulated River Water Sources. Uncertainty was not quantified.
Goulburn Mulwaree Council – the volume is based on metered data. Estimated accuracy based on meter accuracy and professional judgment is +/– 20%.
Sydney Water Corporation – the volume is based on measured data. Estimated accuracy based on meter accuracy is +/– 2%.
Comparative year
The following table compares the value for the 2009–10 year reported in this account with the corresponding value reported in the 2010 Account.
2011 Account line item |
2010 Account line item |
Value reported in the 2010 Account (ML) |
Value reported in the 2011 Account (ML) |
Additional information |
5.2 Surface water allocation remaining – urban water system |
Not applicable |
Not applicable |
0 |
Line item presentation: this line item was not included in the 2010 Account Water accounting statements. In order to reconcile the allocation on the urban water system appropriately it has been included in the 2011 Account as an eliminated line item. |
The scope of this line item has changed in this account from that in the 2010 Account. The scope was changed because of a change in the definition of the region. The 2011 Account considers that all tranfers of water between stores are eliminated from the Water accounting statements and will be presented in the individual Resources and systems note. Line item 5.2 Surface water allocation remaining – urban water system represents a claim on the surface water store on behalf of the urban water system and therefore is not included in the Water accounting statements.