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Aimata Dam
Aimata Dam (相俣ダム) is a dam built on the Akaya River, part of the class-A Tonegawa River system at Aimata in the city of Minami (the former village of Nīharimura), in the Tone District of Gunma Prefecture, Japan.
It is a gravity dam made of concrete, operated by the Ministry of Land, Infrastructure, Transport and Tourism's Kantō Regional Development Bureau, built to a height of 67.0 metres. As a member of the upstream Tonegawa River dam cluster, it supplies water to Tokyo and the Japanese capital region. The dam's purposes are flood prevention at the point where the Akaya River merges with the Tonegawa River in the former city of Tsukiyono, and energy generation via the Gunma Prefecture-operated hydroelectricity facilities, making it a multi-purpose dam. The artificial Akaya Lake was created by the dam.
==History==
In the wake of the massive damage sustained by the Tonegawa River system from 1947's Typhoon Kathleen, the Economic Stabilization Board's consultative flood prevention committee proposed the construction of a reservoir as the pillar of a cumulative plan for developing flood prevention infrastructure. The Ministry of Construction's Kantō Regional Development Bureau drafted the "Tonegawa River Repair and Improvement Plan" in response to this proposal; the plan was based on the construction of (originally) 9 multi-purpose dams on the Tonegawa River system. These eventually became the Tonegawa River 8 Dam Cluster, with one of the dams on the main Tonegawa River—Fujiwara Dam—being already under construction.
Preliminary studies for dam construction were begun on the Akaya River in 1948. Afterward, the dam project's operation was turned over to Gunma Prefecture, rebranded as the auxiliary "Akaya River Cumulative Project"; construction began in 1952, and completed in 1956. However, during initial impoundment (in which the dam is partially filled to test for abnormalities), leakage through the bedrock on the left bank was discovered, and Gunma Prefecture requested repairs from the Ministry of Construction. That same year, concrete work was started to enable seepage control on the left bank. Repairs were completed three years later in 1959, and construction was finalized. Aimata Dam was placed under the direct management of the Ministry of Construction, and became the second of the Tonegawa River 8 Dam Cluster.
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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