Sydney
11.4 Wastewater collected

The volume for the line item is 513,998 ML.

A breakdown of the wastewater collected by the urban system is provided in the following table.

Wastewater collected by urban system – summary

Council/Corporation	Wastewater volume collected during 2010–11 (ML)
Sydney Water Corporation	502,308
Shoalhaven City Council	7,790
Wingecarribbee Shire Council	3,890
Total	513,998

NSW Office of Water calculations.

Shoalhaven City Council (SCC).

This item represents the total metered volume of wastewater collected by SCC's wastewater treatment plants.

The calculation includes:

• grease trap waste
• on-residential
• residential
• septic tank effluent
• septic tank sludge/pan
• tradewaste.

The volume of wastewater collected/treated at sewerage treatment plants may also include any net ingress of stormwater or groundwater to the sewer system.

The volume is based on measured data. Estimated uncertainty based on meter accuracy is +/– 5%.

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

SWC.

The total volume of wastewater collected and treated at SWC's wastewater treatment plants and water recycling plants is detailed in the following table.

Wastewater collected by Sydney Water Corporation

Plant type	Wastewater treatment plant	Volume of effluent treated (excluding volume treated for on-site use) (ML)
Water recycling	Bombo	1,862
	Castle Hill	3,053
	Gerroa	323
	Glenfield	156
	Liverpool	1,597
	Penrith	8,718
	Picton	554
	Quakers Hill	11,419
	Richmond	685
	Rouse Hill	6,137
	St Marys	14,607
	West Camden	3,864
	Wollongong	21,703
Wastewater treatment	Bellambi1	504
	Bondi	46,165
	Brooklyn	94
	Cronulla	20,643
	Fairfield1	740
	Hornsby Heights	2,250
	Malabar	185,499
	North Head	143,815
	North Richmond	317
	Port Kembla1	790
	Riverstone	561
	Shellharbour	7,031
	Wallacia	227
	Warriewood	6,815
	West Hornsby	4,840
	Winmalee	7,339
Total		502,308

¹A wet-weather wastewater treatment plant, which is only used during major storms

 

Volumes for both components have been derived from metered outflow data from the plants. The flow meter data are continually monitored and recorded using the Integrated Instrumentation Control Automation and Telemetry System (IICATS). The data are stored within an internal data management system. Adjustments are made to the data (if necessary) to correct any interruptions, errors and so on. From the data management system, data have been extracted for the reporting period.

• The volume does not include water losses in the treatment process including biosolid removal, de-watering and evaporation.
• Total wastewater treated can include net ingress from stormwater and groundwater.
• At wet-weather wastewater treatment plants, wastewater treated usually also includes a certain volume of stormwater.

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

Wingecarribee Shire Council (WSC) Plant SCADA (Citec) records and DECC annual return reports 2009–10.

WSC.

This item represents the total volume of wastewater collected at wastewater treatment plants.  The volume is derived from data from inflow meters at wastewater treatment plant where applicable.

Total wastewater treated for the 2010–11 year at WSC-operated wastewater treatment plants

Wastewater treatment plant	Total wastewater treated in the 2010–11 year (ML)
Moss Vale	899
Bowral	1,594
Mittagong	1,013
Berrima	101
Bundanoon	283
Total	3,890

Total wastewater received can include net ingress from stormwater and groundwater. Inflows to plants have only been measured at Moss Vale, Berrima and Bundanoon wastewater treatment plants. Therefore, treated volumes shown above are the same as discharge volumes shown under 'Volume of (treated) wastewater discharged to surface water' for these plants.

The volume is based on measured data. Estimated uncertainty based on meter accuracy and professional judgment is +/– 7%.

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 11.4

2011 Account line item	2010 Account line item	Value reported in the 2010 Account (ML)	Value reported in the 2011 Account (ML)	Additional information
11.4 Wastewater collected	Not applicable	–	–	Line item presentation: this is a new line item not reported in the 2010 Account

 

This is a new line item introduced to the account due to a change in the definition of the region. The 2011 Account considers that all individual users (including commercial and industrial sectors) are not part of the region. Therefore, wastewater from users that is collected by the wastewater collection system is considered to 're-enter' the region, which represents a water asset increase.

In the 2010 Account, individual users were considered to be part of the region. Therefore, the volume of wastewater collected from users was not a water asset increase.