Perth
19.8 Other wastewater discharge

Supporting Information

This line item refers to the treated wastewater discharged to infiltration lagoons.

Total volume of treated wastewater discharged into infiltration lagoons from each treatment plant during the 2010–11 year is given in the following table.

 

Volume of treated wastewater discharged into infiltration lagoons from each treatment plant during the 2010–11 year

Wastewater treatment plant

Total outflow (ML)

Perth city area

 

Bullsbrook

67

Mundaring

42

Two Rocks

5

Yanchep

152

Southwest area

 

Caddadup

442

Gordon Road (Mandurah)

2,982

Halls Head

1,043

Other

 

Binningup

20

Boddington

34

Total discharge to infiltration lagoons

4,787

 

Quantification Approach

Data Source

Water Corporation: Operational Data Storage System.

Provided by

Water Corporation.

Method

The total volume of water discharged into infiltration lagoons is estimated by subtracting the volume of recycled wastewater from the total inflow of water into the treatment plant. Both inflow and recycled volume data are based on measured discharge data collected at the site.

Assumptions, Limitations, Caveats and Approximations

It is assumed that the volume of treated wastewater discharged into infiltration lagoons is simply the total inflow of wastewater into the wastewater treatment plant minus the volume of water recycled.

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.

 

Comparative year information for line item 19.8

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

19.8 Other wastewater discharge

20.4.3 Other lumped wastewater discharge

4,608

4,608

Change in line item name and number