Water Supply
Lake Argyle normally has a surface area of about 1,000 square kilometres. The storage capacity, to the top of the spillway is 10,763,000 megalitres. The lake filled to capacity in 1973, and the spillway flowed until 1984. Lake Argyle's usual storage volume is 5,797,000 megalitres, making it the largest reservoir in Australia. The combined Lake Gordon/Lake Pedder system in Tasmania is larger but is two dams connected by a canal. At maximum flood level, the lake would hold 35 million megalitres of water and cover a surface area of 2,072 square kilometres.
Lake Argyle, together with Lake Kununurra, is part of the Ord River Irrigation Scheme. There are currently some 150 square kilometres of farmland under irrigation in the East Kimberly region. The original plan was for dam water to irrigate rice crop for export to China. However these plans were scuttled as waterfowl, particularly magpie geese ate rice shoots quicker than they could be planted. Other crops are now grown, but Lake Argyle still remains Australia's most under-utilized lake.
Read more about this topic: Lake Argyle
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