Sydney
11.4 Wastewater collected
Supporting Information
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.
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 |
Quantification Approach
Shoalhaven City Council
Data Source
Provided by
Method
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.
Assumptions, Limitations, Caveats and Approximations
The volume of wastewater collected/treated at sewerage treatment plants may also include any net ingress of stormwater or groundwater to the sewer system.
Uncertainty Information
The volume is based on measured data. Estimated uncertainty based on meter accuracy is +/– 5%.
Sydney Water Corporation
Data Source
Provided by
Method
The total volume of wastewater collected and treated at SWC's wastewater treatment plants and water recycling plants is detailed in the following table.
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.
Assumptions, Limitations, Caveats and Approximations
- 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.
Uncertainty Information
The volume is based on measured data. Estimated uncertainty based on meter accuracy is +/– 2%.
Wingecarribee Shire Council
Data Source
Provided by
Method
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.
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 |
Assumptions, Limitations, Caveats and Approximations
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.
Uncertainty Information
The volume is based on measured data. Estimated uncertainty based on meter accuracy and professional judgment is +/– 7%.
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.
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.