Sydney
11.21 Other urban water increases

Urban water utilities diverted 5,768 ML from streams to the urban water system during 2010–11 (see the following table). This volume is the portion of line item 17.11 Surface water allocation diversion  that was diverted to the urban water system.

 

Breakdown of diversion of flows by other urban entitlement holders

Urban holder	Water source	Water treatment plant	Water diverted during 2010–11 (ML)
Goulburn Mulwaree Council	Wollondilly River	Marulan	85
Palerang Council	Shoalhaven River	Braidwood	94
Sydney Water Corporation	Hawkesbury and Lower Nepean Rivers	North Richmond	5,589
Total			5,768

 

Data spreadsheets.

Goulburn Mulwaree Council.

Diversions to the water treatment plants (WTPs) were measured at the plants. At Marulan WTP, outflow from the plant was measured using a flow meter.

Nil.

The volume is based on metered data. Estimated accuracy based on meter accuracy and professional judgment is +/– 20%.

Database maintained as spreadsheets.

NSW Office of Water.

An ABB Magmaster-type induction meter was used to measure flow data. 

Nil.

The volume is based on metered data. Estimated accuracy based on meter accuracy is +/– 2%. Meters are calibrated annually by ABB (meter supplier).

Data managed and maintained in an internal data management system by the Sydney Water Corporation's Operations Division (Hydraulic Systems Services).

SWC.

Volumes were derived from metered outflow data from WTPs.

The flow meter data are continually monitored and recordedusing the Integrated Instrumentation Control Automation and Telemetry System. The data are stored within a complex data management system. Adjustments are made to the data (if necessary) to correct any interruptions, errors and so on. Data have been extracted for 2010–11 from the data management system.

As data on inflow to each WTP is not available, metered outflow is assumed to be equal to the surface water taken. The volume taken from surface water can be higher than the outflow volume due to losses associated with pipe systems and the filtration process.

This line item applies to SWC only for its water diversions from the Hawkesbury River to North Richmond WTP. All the other supplies to SWC are made by the Sydney Catchment Authority.

The volume is based on measured data. Estimated accuracy based on meter accuracy is +/– 2%.

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 11.21

2011 Account line item	2010 Account line item	Value reported in the 2010 Account (ML)	Value reported in the 2011 Account (ML)	Additional information
11.21 Other urban water increases	19.3.1 Unregulated inflow of surface water into the urban water supply system	6,295	0	This line item no longer occurs in the Water accounting statements.