Adelaide
9.9 Discharge from urban water system

The volume reported (4,620 ML) represents treated wastewater discharge from five wastewater treatment plants (WWTPs) to rivers in the Adelaide region and potable water discharge from  Swan Reach–Stockwell Pipeline to the South Para River. The following table details the volumes of  treated wastewater and potable water discharged to rivers during the 2012–13 year. 

Discharge to surface water in the Adelaide region during the 2012–13 year

Discharge type	Discharge description	Volume (ML)
Treated wastewater discharge	Angaston WWTP discharge to North Para River	27
	Bird-in-Hand WWTP discharge to Dawesely Creek–Onkaparinga Catchment	418
	Hahndorf discharge to Hahndorf Creek–Onkaparinga Catchment	315
	Heathfield discharge to Sturt River	631
	Victor Harbor discharge to Hindmarsh Reservoir and Inman River	806
Subtotal		2,197
Potable water discharge	Transfer from  Swan Reach–Stockwell Pipeline to the South Para River	2,423
Subtotal		2,423
Total		4,620

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.

Supervisory Control and Data Acquisition (SCADA) database or manual field instrument readings, stored in the MetDaily file.

SA Water.

Metered potable water discharge (transfer) from Swan Reach–Stockwell Pipeline to the South Para River for the 2012–13 year was obtained from SA Water's SCADA database and/or MetDaily file.

Nil.

The uncertainty estimate was not quantified.

WWTP records and Supervisory Control and Data Acquisition database (SCADA).

SA Water.

The metered discharge of wastewater to surface water was obtained from SA Water's WWTP records. Metered flows are either automatically logged by SCADA or manually read and recorded by plant operators.

The volume reported does not include any wastewater discharge from community waste management systems managed by local councils.

Uncertainty is +/– 10% based on meter calibrations.