TheJandakot Mound, orJandakot Groundwater Mound, is an unconfinedaquifer in south-westernWestern Australia. It is the smaller of the two main shallow aquifers nearPerth (the other being theGnangara Mound, north of the Swan River) that together supply about 40% of Perth's drinking water. Its highest point lies about 18 km (11 mi) south of Perth'scentral business district. It stretches from theSwan River in the north to theSerpentine River in the south, and from theIndian Ocean in the west to theDarling Scarp andSouthern River in the east, covering an area of about 760 km2 (290 sq mi).
The Jandakot Mound is a sand aquifer with a saturated thickness of up to 40 m (130 ft). It contains an estimated 4,200gigalitres (150 billioncubic feet) of fresh water, and the annual recharge can reach 76 gigalitres (2.7 billion cubic feet). It contributes 9 gigalitres (320 million cubic feet) annually to Perth's municipal supply of drinking water and is also heavily used for private supplies. Where it is close to the surface, it supports extensive wetland systems, the most important of which areBeeliar Wetlands,Forrestdale andThomsons Lakes. It also recharges the deeper confined aquifers in the area, theLeederville andYarragadee Aquifers.
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