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The Darwin River Dam is located in Australia's Northern Territory on the Darwin River. The water catchment it contains is the major source for the city of Darwin. The dam can hold up to 259,000 megalitres of water () which is half the volume in Sydney Harbour or eleven times bigger than the Manton Dam.〔(【引用サイトリンク】title=Darwin Water Supply )〕 The Darwin River Dam is an embankment-type dam. It is ungated with no spillway regulation possible. The dam relies on the annual wet season to be replenished. Toward the end of this season, the dam sometimes overflows. Most years spilling occurs, and is considered normal. Depending on rainfall amounts, this overflow can last from days to weeks.〔(【引用サイトリンク】title=Darwin River Dam Levels )〕 The water in this dam is considered to be one of the most pristine on Earth. In order to preserve this quality, the catchment and reservoir policy prohibits recreational use with substantial penalties imposed for tresspassing. Also, there is no ''Cabomba'', an aquatic weed genus that can affect water quality.〔(The facts Darwin River Dam - A pristine environment - July 2008 )〕 It was opened by William McMahon (the Prime Minister at the time) on 29 June 1972. The cost of construction was $9 million.〔 ==See also== * Irrigation in Australia * List of dams and reservoirs in Australia 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Darwin River Dam」の詳細全文を読む スポンサード リンク
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