The Adelaide water supply area has an area of ~3127 km2 and consists of the following WMAs, Northern Adelaide Plains, Little Para, Yatla, McLaren Vale PWA, Parra Wirra, Lower Torrens, Upper Torrens, Patawalonga, Onkaparinga, Myponga and Adelaide. Like any metropolitan supply area it consists of a complex array of supply, storage and delivery systems that has grown with the city (Figure 107). Total population of the water supply area is ~1,066,100 (ABS 2001 Census).
The main drainage features in the area are the River Torrens, Onkaparinga River and the Sturt River, which all discharge to the ocean. Urban stormwater is also a significant input to surface water with a number of natural creeks discharging to stormwater drains.
The total transfer of water into the WMA is ~165,000 ML. In normal years, 60% of this water comes from runoff in the Mt Lofty Ranges with an additional 40% coming from the River Murray, though in dry years this percentage can increase to 90% (http://www.sawater.com.au/SAWater/Education/OurWaterSystems/Pipelines.htm). While the water delivery system in South Australia consists of a number of reservoirs, there are no major reservoirs located in the WMA.
Groundwater recharges largely in the Adelaide hills in the southeast part of the WSA and moves towards the coast.
Overall, water management is by the South Australian Department of Water, Land and Biodiversity Conservation with bulk water supplied by SA Water. Figure 2 shows the major storages, pipelines from the Murray and water supply distribution network in the Adelaide water supply area.
Figure 1 Adelaide water supply area locality map
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Adelaide water supply area locality map (1.2 Meg)
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Figure 2 Adelaide water supply area schematic map (Source: SA Water, 2003)