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The North Pine Dam is a mass concrete gravity dam with earth-fill embankments on abutments with a gated spillway across the North Pine River that is located in the South East region of Queensland, Australia. The main purpose of the dam is for supply of potable water for the Moreton Bay region and Brisbane's northern suburbs.〔 The impounded reservoir is called Lake Samsonvale. ==Location and features== The dam is located north-west of Brisbane, within the Moreton Bay region, at , near the settlements of Whiteside and Joyner. The North Pine Dam was designed by the Department of Local Government, with the Co-ordinator General's Department supervising construction contracts headed by Transfield. The cost of the dam was 20 million, and the dam was opened on 12 August 1976 by the Lord Mayor of Brisbane City Council, Alderman Frank Sleeman. The concrete dam structure is high and long. The dam wall holds back the reservoir when at full capacity. From a catchment area of that includes much of the southeastern slopes of the D'Aguilar National Park, the dam creates Lake Samsonvale at an elevation of above sea level, with a surface area of . The gated spillway, with five steel gates, has a discharge capacity of .〔 Initially managed by the Brisbane City Council and then SunWater, management of the dam was transferred to SEQ Water in July 2008 as part of a water security project in the South East Queensland region, known as the South East Queensland Water Grid. The accompanying water treatment plant is also managed by SEQ Water. Prior to the initial flooding of the valley, many of the surrounding grazing and dairy farms were compulsorily acquired, and the only evidence of these farms is now the names of roads leading to the lake's shoreline, such as Winn Road and Golds Scrub Lane. Golds Scrub Lane now leads only to the Samsonvale Cemetery; prior to the flooding of the dam, the site was also home to a church and a post office. To allow for the dam's flooding, of road had to be relocated and rebuilt.〔 In May 2007, the dam, which was providing approximately per day or 20% of the region's water supply, was taken offline as a safety precaution.〔 The drought in Australia caused water levels to drop to 14% capacity, the lowest since it was built. The cessation of water supply was meant to protect the dam from potential blue green algae blooms in the coming summer months. The operators continued to release between per day to service the North Pine River.〔 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「North Pine Dam」の詳細全文を読む スポンサード リンク
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