Sydney
9.15 Increase of inter-region surface water claim on water

Supporting information

The volume of 11,834 ML represents the surface water claim on the Fish River Water Supply Scheme for Sydney Catchment Authority and Delta Electricity for the 2012–13 year. 

Each agency has an annual maximum allocation entitlement from the Fish River Water Supply Scheme to supply water to their 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. These are detailed in the following table.

Lithgow City Council also has an entitlement on the Fish River Water Supply Scheme which is reported in 11.15 Increase of inter-region claim on water by the urban water system.


Maximum allocation limits and carryover for the Fish River Water Supply Scheme during the 2012–13 year

Organisation

Maximum allocation entitlement (ML)

Carryover as at 30 June 2013 (ML)

Carryover as at 30 June 2012 (ML)

Delta Electricity

8,184

1,637

1,637

Sydney Catchment Authority

3,650

730

730

Total

11,834

2,367

2,367

Quantification approach

Delta Electricity

Data source

Fish River Water Supply Scheme Weekly Use Report 2012–13.

Provided by

New South Wales Office of Water.

Method

The volume of water supplied and allocated from the Fish River Water Supply Scheme to Delta Electricity is based on water supply agreements between the New South Wales State Water Corporation and Delta Electricity.

Assumptions, limitations, caveats and approximations

Nil.

Uncertainty information

The uncertainty estimate was not quantified.

Sydney Catchment Authority

Data source

Sydney Catchment Authority databases.

Provided by

Sydney Catchment Authority.

Method

The volume of water supplied and allocated from the Fish River Water Supply Scheme to Sydney Catchment Authority is based on water supply agreements between the New South Wales State Water Corporation and the Sydney Catchment Authority.

Assumptions, limitations, caveats and approximations

Nil.

Uncertainty information

The uncertainty estimate is not quantified.

Comparative year

The volume previously reported in the 2011–12 year included the Lithgow diversion of 1,778 ML. As Lithgow City Council diversions are now part of the urban water store this volume is now accounted for in 11.15 Increase of inter-region claim on water by urban water system.

Therefore the volume reported in the 2011–12 year has been restated as 11,834 ML.