Adelaide

20.7 Other lumped water distribution system decreases

Supporting information

The volume reported in the water accounting statement (11,404 ML) represents several decreases from the water distribution system:

potable export to urban areas outside the Adelaide region
water treatment plant (WTP) losses
wastewater treatment plant (WWTP) losses.

The volume associated with each of these decreases for 2009–10 is provided in the table below.

Component	Volume (ML)
Potable export to urban areas outside Adelaide region	3,627
Water treatment plant losses	7,051
Wastewater treatment plantlosses	726
Total	11,404

The inflow, outflow and process loss for each WTP in the Adelaide region is provided in the table below.

Water treatment plant	Inflow (ML)	Outflow (ML)	Loss (ML)
Anstey Hill	25,118	23,862	1,256
Barossa	12,899	12,285	614
Happy Valley	66,651	63,138	3,513
Hope Valley	19,178	18,265	913
Little Para	14,683	14,218	465
Myponga	5,586	5,215	371
Summit Storage	5,533	5,614	–81
Total	149,648	142,597	7,051

Note: Negative losses are due to errors; the source of these errors are unknown.

The inflow, outflow and process loss for each WWTP in the Adelaide region are provided in the table below:

Waste Water Treatment Plant	Inflow (ML)	Outflow (ML)	Process loss (ML)
Aldinga	495	426	69
Bolivar	50,780	49,371	1,409
Bolivar—high salinity	8,155	8,141	14
Christies Beach	9,330	9,521	–191
Glenelg	16,359	17,073	–714
Port Adelaide	0	0	0
Angaston	165	120	45
Bird-in-Hand	496	402	94
Gumeracha	47	49	–2
Hahndorf	320	320	0
Heathfield	687	687	0
Myponga	27	2	25
Victor Harbor	910	933	–23
Total	87,771	87,045	726

Note: Negative losses are due to errors; the source of these errors are unknown.

Quantification approach

Data source

SA Water: Geographic Information System (GIS) and Customer Service Information System (CSIS) databases.

Data provider

Bureau of Meteorology.

Method

Potable export to urban areas outside Adelaide region

GIS analysis was used to extract the service point numbers (SPNs) of meters that are outside the Adelaide Region but are supplied with water from WTPs within the region. The SPNs were used to extract readings for each water meter from the CSIS database for 2009–10.

Water consumption was calculated by analysing the difference between consecutive meter readings and summed for 2009–10. To account for meter readings that occurred immediately before or after 2009–10, metered consumption was apportioned based on the following equation:

V_r = ( t_r / t_m ) × V_m

where:

V_m = volume for metered period (ML)

V_r = volume for metered period within 2009–10 (ML)

t_m = length of period between meter readings (days)

t_r = length of metered period within 2009–10 (days).

Water Treatment Plant (WTP) losses

Metered inflow and outflow data for the seven WTPs listed in the table below was obtained from the SA Water SCADA database for most of these WTPs. Inflow data was not available for the Barossa and Hope Valley WTPs. Barossa and Hope Valley WTP inflow was calculated from the respective WTP outflow, allowing for a 5% loss through the treatment process. Outflow data was not available for the Anstey Hill WTP. Instead, it was calculated assuming a 5% treatment process loss. The total process loss is the difference between WTP inflow and outflow.

Water treatment plant	Inflow—quantification approach	Outflow—quantification approach
Myponga	Metered inflow	Metered outflow
Anstey Hill	Metered inflow	Metered inflow × 0.95
Summit Storage	Metered inflow	Metered outflow
Happy Valley	Metered inflow	Metered outflow
Barossa	Metered outflow × 1.05	Metered outflow
Little Para	Metered inflow	Metered outflow
Hope Valley	Metered outflow × 1.05	Metered outflow

Wastewater Treatment Plant (WWTP) losses

The 2009–10 inflow to and outflow from WWTPs within the Adelaide Region were supplied by each WWTP. The data is measured by flow gauges that were manually read and recorded by plant operators. The WWTP loss was the difference between metered inflow and outflow.

Uncertainty

Ungraded.

Assumptions, approximations and caveats/limitations

Potable export to urban areas outside Adelaide region

Nil.

WTP losses

Nil.

WWTP losses

Volume does not include Port Elliot WWTP data because the data were unavailable.
Volume includes some wastewater collected from outside the Adelaide Region and delivered to the Bird-in-Hand WWTP. However, this volume is negligible.

National Water Account 2010