3.4 Urban inter-region claim on water

Supporting information

The volume of 356 ML represents the surface water claim on the Fish River Water Supply Scheme for Lithgow City Council for the 2012–13 year.

Lithgow City Council has an annual maximum allocation entitlement from the Fish River Water Supply Scheme to supply water to its storages. This entitlement is subject to a number of operating rules and restrictions depending on the levels observed in the supply storages (Oberon Dam and Duckmaloi Weir). There is also the ability to carryover a maximum of 20% of the total allocation into the following year.

No restrictions were in place over the entire 2012–13 year, therefore the maximum allocation limits and carryover volumes were applicable for the 2012–13 year.

Both Delta Electricity and Sydney Catchment Authority held an inter-region claim on the Fish River Water Supply Scheme which is reported in line item 1.5 Inter-region claim on water.

Quantification approach

Data source

Lithgow City Council, spreadsheets; New South Wales Office of Water Fish River Water Supply Scheme Weekly Use Report 2012–13.

Provided by

Lithgow City Council; New South Wales Office of Water.


The metered supply volume is based on flow measurements by New South Wales State Water Corporation using ABB magflow meters. Entitlement volume is the maximum allocation volume granted for the Lithgow City Council.

Assumptions, limitations, caveats and approximations

Entitlement for the whole Sydney region assumed to be the maximum allocation entitlement for the Fish River Water Supply Scheme.

Uncertainty information

The uncertainty estimate was not quantified.

Comparative year

The volume stated in this line item represents the urban inter-region claim for Lithgow City Council. In the 2012 Account, this volume was incorporated in line item 1.5 Inter-region claim on surface water. As Lithgow City Council diversions are now considered a part of the urban water store, this volume has been restated to 356 ML in the 2012 Account.