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Site assessment conducted |
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Reference Panel approved |
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Positive sustainability aspect
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Multiple use benefits
Principally developed to meet increasing electricity demand during the post-war urbanization of Japan, Miygase Dam also resulted in the ability to better manage flooding, provide potable water, improve environmental flows and develop a thriving tourist industry.
Source: IEA Hydropower Implementing Agreement - Annex VIII.
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Overview
Situated on the Nakatsu River within 50km of central Tokyo, Japan, the Miyagase Dam Development Project was announced in 1969 to address issues of flood management and water dependant development resulting from rapid post-war urbanization of areas in and around the Sagami River basin. In addition, the dam was intended to improve the river environment, provide a potable water supply and generate hydropower.
The dam is a 156m gravity-type concrete structure with a crest length of 400m. Construction commenced in November 1987, with excavation completed in the first half of 1991 and the remainder of the project completed in November 1994. The dam commenced operating in October 1995 and was later modified by the construction of the Doshi Conduit, commissioned in April 2001.
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Scheme Specifications
Dam Name
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Scheme operator
Ministry of Land, Infrastructure and Transport
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Size of scheme (MW)
24.4
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Country
Japan
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Catchment area
213.9km2
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River
Nakatsu River
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Effective reservoir capacity
200 x 106m3
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Construction years
1987-1991
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Reservoir size
4.6 km2
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