Perth
19.7 Wastewater discharge outside of region
Supporting Information
This line item refers to the treated wastewater discharged to the sea.
Total volume of treated wastewater discharged to the sea from each treatment plant during the 2010–11 year is given in the following table.
Wastewater treatment plant |
Total outflow (ML) |
Perth city area |
|
Alkimos |
1,074 |
Beenyup |
43,166 |
Point Peron |
6,081 |
Subiaco |
21,220 |
Woodman Point |
45,537 |
Total discharge to sea |
117,078 |
Quantification Approach
Data Source
Provided by
Method
The total volume of wastewater discharged into the sea is not metered and is estimated as total inflow of wastewater into the treatment plant minus the volume of water recycled.
Assumptions, Limitations, Caveats and Approximations
Outflows from these treatment plants are not measured. It is assumed that the volume of wastewater discharged into the sea is simply the total inflow of wastewater into the treatment plant minus the volume of water recycled and there are no other losses.
Uncertainty Information
This value is estimated to be in the range of +/– 5–10%.
Comparative year
The following table presents substantive changes in the line item reported in this 2011 Account with the corresponding line item in the 2010 Account.
2011 Account line item |
2010 Account line item |
2011 Account volume for the 2009–10 year (ML) |
2010 Account volume for the 2009–10 year (ML) |
Change from the 2010 Account to the 2011 Account |
19.7 Wastewater discharge outside of region |
20.4.2 Wastewater discharge out of entity |
116,507 |
116,507 |
Change in line item name and number |