21.1 Surface water allocation announcements

Supporting information

The volumetric value for the allocation/claim for this entitlement category for the 2012 Account is 157,620 ML.

This line item reflects the liability to the surface water store from the allocation/claim considered for the surface water entitlement holders in the region. The allocation/claim for this line item represents water access licences in the Sydney region by individual holders for stock and domestic, other lumped holders and industrial and commercial entitlement holders.

As no formal allocation process takes place in the Sydney region, the volume used to allocate volume for stock and domestic and other lumped holders is based on information available in the Water Sharing Plan for the Greater Metropolitan Region Unregulated River Water Sources. For the purposes of the National Water Account, allocation volumes are assumed to be 100% of the entitlement outlined in the water sharing plan. For major utitlities (Delta Electricity and Eraring Energy) the value is based on the entitlements stated in each organisations water management licence with an assumed allocation of 100% at the beginning of 2011–12.

A breakdown table of the rights associated with this line item is provided in the following table.

Water rights associated with this entitlement itemised by category and sub-category



Total right  (ML)

Major Utility (Power Generation)

Delta Electricity's and Eraring Energy's water management licence


Individual holder for stock and domestic

Domestic and stock, domestic and stock (domestic), domestic and stock (stock)


Other lumped holders

Unregulated river


Reconciliation of this line item is shown in the following table.

Calculations of the surface water liability for the 2011–12 year
Line item
Volume (ML)


5.1 Opening balance (as at 30 June 2011)



21.1 Surface water allocation announcements



17.11 Surface water allocation diversion



13.1 Adjustment of surface water allocation



5.1 Closing balance (as at 30 June 2012)


Quantification approach

Data source

The Water Sharing Plan for the 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

The Bureau calculated opening and closing balance; New South Wales Office of Water, Shoalhaven City Council, Goulburn Mulwaree Council, Palerang City Council and Sydney Water Corporation provided entitlement data.


Mapping entitlement values stated in the Water Sharing Plan for the Greater Metropolitan Unregulated River Water Sources, water management registers, and licence and trading statistics to the relevant categories of entitlements. Diversion data was obtained from the relevant authorities as shown in line item 17.16.

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 of the reporting year is zero, as shown in the previous reconciliation table.

Assumptions, limitations, caveats and approximations


Uncertainty information

New South Wales Office of Water–values associated with this line item were estimated. Estimated uncertainty is +/– 30% to 50% based on professional judgment and established practice within the New South Wales Office of Water.


Comparative year

In the 2010–11 Account, entitlements of 20,074 ML were incorrectly stated in this line item. These include Goulburn Mulwaree Council's entitlements for the Marulan Water Treatment Plant, Palerang City Council's entitlements from the Shoalhaven River and Sydney Water Corporations entitlements from the Hawkesbury and Lower Nepean rivers. As these water rights are held for the urban water store, the allocation/claim is now recognised under 21.2 Surface water allocation announcements – urban water system. This line item also now includes 29,021 ML for Delta Electricity's and Eraring Energy's entitlement for Major utility (Power generation), previously reported under 11.20 Increase of other urban claims on water. Consequently, the value for this line item has been restated from 149,535 ML to 157,802 ML.