11.14 Other delivery of water to urban water system

Supporting Information

Delta Electricity diverted 21,308 ML from Thomsons Creek Reservoir, Lake Lyell and Lake Wallace for the Mt Piper and Wallerawang power stations.

Quantification Approach

Data Source

Delta Electricity data spreadsheets.

Provided by

Delta Electricity.


Ultrasonic flow meters were used to measure flow from Lake Lyell, Lake Wallace and Thomsons Creek Reservoir to the Mt Piper and Wallerawang power stations.

Assumptions, Limitations, Caveats and Approximations

The volume of water diverted from the Coxs River system to the power stations (21,308 ML)is based on the total volume of water extracted and includes the volume reported in line item 9.10 (4,885 ML).

Uncertainty Information

The volume is based on measured data. Estimated uncertainty based on meter accuracy is +/– 2%. Meters are regularly calibrated. The NSW Office of Water conducts an annual verification review on Delta Electricity's water data.

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 11.14

2011 Account line item

2010 Account line item

Value reported in the 2010 Account (ML)

Value reported in the 2011 Account (ML)

Additional information

11.14 Other delivery of water to urban system

19.8.8 Allocation diversion into the urban water supply system – other lumped



Change in line item name