9.9 Discharge from urban water system
The volume reported (2,203 ML) represents discharge from several wastewater treatment plants (WWTPs) operated by SA Water into rivers in the Adelaide region. The breakdown of WWTP discharge is presented in the following table. Treated wastewater from the Victor Harbor WWTP is temporarily stored in Hindmarsh Reservoir during summer and then released to the Inman River in the winter months.
|Wastewater treatment plant||
Surface water discharge point
Discharge volume (ML)
|Angaston||North Para River||
|Bird-in-Hand||Dawesely Creek—Onkaparinga Catchment||
|Hahndorf||Hahndorf Creek—Onkaparinga Catchment||
|Victor Harbor||Hindmarsh Reservoir and Inman River||
The metered discharge of wastewater to surface water during the 2011–12 year from these WWTPs was supplied from WWTP records held by SA Water. These metered flows were manually read and recorded by plant operators.
Assumptions, limitations, caveats and approximations
Treated effluent from the Victor Harbor WWTP was discharged to Hindmarsh Reservoir for summer storage and then released to the Inman River in winter months.
The line item does not include any discharge from community waste management systems that were managed by local councils.
The uncertainty estimate is not quantified.