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Okukubi Dam
The is a trapezoidal cemented, sand and gravel (CSG) dam on the Okukubi River in Kin, Okinawa Prefecture, Japan. Construction began in 2009 and its reservoir was filled by 31 March 2013.〔 It is the first trapezoidal CSG-type to be constructed as a main dam in the world.〔(【引用サイトリンク】url=http://www.dc.ogb.go.jp/hokudamu/e/okukubidam.html )〕 Its purpose is to provide flood control and water for municipal use along with the irrigation of of land.〔(【引用サイトリンク】url=http://www.dc.ogb.go.jp/hokudamu/jigyou/kakudamu/okukubi/mokuteki/index.html )〕
==Background==
Construction on the dam had originally begun in 1978. At that time, it was designed as a concrete gravity dam. Construction was halted soon after it began though. The dam was redesigned over the next few decades and after the new project was approved, preliminary construction for the dam began in late 2003. Principal construction began on March 24, 2009 and there was a groundbreaking ceremony on June 5, 2009. To divert the river, a cofferdam did not need to be constructed. The existing Kinmu Dam upstream was modified to divert the river on the left bank of the river. In May 2010, the river was diverted and by August of the same year, over of rock and stone had been excavated from the site. On February 26, 2011, a ceremony was held to bury the cornerstone of the dam prior to beginning the fill of the dam's body. It was attended by Japanese and U.S. officials (due to the dam's location within the U.S. Marine Central Training Area). It will cost ¥3 billion (US$38.2 million) and it is was completed in March 2013.〔〔(【引用サイトリンク】url=http://www.niraikanai.wwma.net/pages/wildhorse/chap3-12.html )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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