Sydney
19.20 Other urban water decreases
Supporting Information
The total volume for this line item is 4,936 ML.
This volume calculated for this line item is Delta Electricity's total discharged metered volume of treated industrial wastewater (4,885 ML) from Wallerawang Power Station to the Coxs River (upstream of Lake Lyell) plus the calculated volume of non-revenue potable water (51 ML) from Shoalhaven City Council.
Quantification Approach
Delta Electricity
Data Source
Provided by
Method
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.
Shoalhaven City Council
Data Source
Provided by
Method
A leakage value is derived by a calculation of the total water treated less authorised potable supply (line item 19.4). The NSW Office of Water will make adjustments if the calculation produces a figure that is outside a specified percentage of total water supplied.
Assumptions, Limitations, Caveats and Approximations
Uncertainty Information
Estimated uncertainty, based on meter accuracy and professional judgment on determination of boundaries of water supply areas beyond the Sydney region, is +/– 5%.
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.
2011 Account line item |
2010 Account line item |
Value reported in the 2010 Account (ML) |
Value reported in the 2011 Account (ML) |
Additional information |
19.20 Other urban water decreases |
13.7.3 Discharge after use of water diverted by industries |
6,160 |
6,160 |
Change in line item name |