Sydney
11.18 Increase of urban claim on surface water

Supporting Information

This line item reflects the liability to the surface water store from the allocation/claim considered for the surface water store from the allocation/claim considered for urban water access entitlement category.

The volumetric value for the allocation/claim for the regulated urban water access entitlement category for 2010–11 is 1,022,865 ML.

Entitlement values used to estimate allocated volume are based on information available in the Draft Water Sharing Plan — Greater Metropolitan Unregulated River Water Sources. As no formal allocation announcement has occurred and water plans were not finalised during the 2011 year, the water allocation for 2010–11 was assumed to be 100% of the entitlement outlined in the Draft Water Sharing Plan.

These volumes did not officially take effect until 1 July 2011 (see  Water legislation in the Contextual information for further details)  but for the purposes of the National Water Account it was deemed applicable at the time. Therefore, stated entitlement values are provisional and an estimate only,


Entitlement values for the Sydney region for the 2011 Account
Utility type Allocated volume for 2010–11 (ML) Utility name Diversions associated with the allocation
Major utility 987,0001 Sydney Catchment Authority  Diversions to Sydney Water Corporation for Sydney Greater Metropolitan Area 
Diversions from Bendeela Pondage to Kangaroo Valley for Shoalhaven City Council 
Diversions from Wingecarribee Reservoir to the Wingecarribee Water Treatment Plant (WTP) for Wingecarribee Shire Council 
Diversions to some retail customers
Local water utility 35,8651 Goulburn Mulwaree Council Goulburn Mulwaree Council diversions to Goulburn WTP from storages
Lithgow City Council Lithgow City Council diversions to Oakey Park WTP from a storage
Shoalhaven City Council Sydney Catchment Authority diversions from Lake Yarrunga (Tallowa Dam) for pumping at Burrier for Shoalhaven City Council
Wingecarribee Shire Council Wingecarribee Shire Council diversions to Medway and Bundanoon WTPs from storages
Total 1,022,865    
1Allocated volume is based on a 100% assumed allocation.


Quantification Approach

Data Source

Draft Water Sharing Plan – Greater Metropolitan Unregulated River Water Sources; Entitlement data recorded in databases and water management licences for Goulburn Mulwaree Council, Lithgow City Council, Shoalhaven City Council and Wingecarribee Shire Council.

Provided by

Bureau of Meteorology: calculated allocation announcement/claim; NSW Office of Water, Shoalhaven City Council, Goulburn Mulwaree Council, Lithgow City Council and Wingecarribee Shire Council: entitlement data.

Method

The volumetric value for the announced allocation/claim for urban system entitlements/arrangements in the Sydney region was estimated by mapping entitlement values stated in the draft water sharing plan to the relevant category of entitlements, and applying an assumed allocation 100% at the beginning of 2010–11. Entitlements for the Sydney Catchment Authority (major utility) and four local water utilities — Shoalhaven City Council, Goulburn Mulwaree Council, Lithgow City Council and Wingecarribee Shire Council — were taken into account.

Assumptions, Limitations, Caveats and Approximations

There is no process of formal allocation announcement for the entitlement holders considered in this line item. Taking into consideration the water availability at the beginning of 2010–11, an allocation of 100% was assumed.

Calculated announced allocation/claim includes both water available to the end users and system losses. Entitlement values used for the calculation of announced allocation/claim are provisional and an estimate.

See  Water entitlements in Contextual information for further details of the entitlement system in Sydney region. 

Uncertainty Information

The volume was estimated. Uncertainty was not quantified.

Comparative year

The following table compares the value at 30 June 2010 reported in this account with the corresponding value reported in the 2010 Account.

                                                                                                    

Comparative information from the 2010 Account for line item 11.18

2011 Account line item

2010 Account line item

Value reported in the 2010 Account (ML)

Value reported in the 2011 Account (ML)

Additional information

11.18 Increase of urban claim on surface water

23.8 Allocation announcement on regulated flows – High security, urban holder

1,022,865

1,022,865

Change in line item name