9.10 Direct discharge by user

Supporting Information

Delta Electricity discharged a total metered volume of 4,885 ML from Wallerawang Power Station to the Coxs River (upstream of Lake Lyell). Industrial wastewater from the power station was treated and discharged to the river.

Quantification Approach

Data Source

Delta Electricity data spreadsheets.

Provided by

Delta Electricity.


Ultrasonic flow meters were used to measure discharge from the power stations.

Assumptions, Limitations, Caveats and Approximations

Discharge from power stations flows to the Coxs River and its tributaries.

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 for the 2009–10 year reported in this account with the corresponding value reported in the 2010 Account.


Comparative information from the 2010 Account for line item 9.10

2011 Account line item

2010 Account line item

Value reported in the 2010 Account (ML)

Value reported in the 2011 Account (ML)

Additional information

9.10 Direct discharge by user 

13.7.3 Discharge after use by industries



Change in line item name