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Techi Dam
Techi Dam () is a concrete thin arch dam on the Dajia River in Heping District, Taichung, Taiwan. Forming the Techi Reservoir, the dam is built in the Tachien Gorge in Heping District, providing hydroelectric power, irrigation water and some flood control, and is operated by the Taiwan Power Company. At , it is the highest dam in Taiwan and one of the tallest dams in the world. The dam was completed in 1974, after five years of construction.
==History==
Proposals to dam the Dajia River date back to the Japanese occupation of Taiwan during World War II, when dams were envisoned to generate 430 megawatts (MW) of power on the river. In 1936, the Taiwan Power Company began to survey and collect data at this site, but there would be a gap of more than ten years between Taiwan's 1945 independence from Japan and the beginning of development on the Dajia River. The Tienlun and Kukuan Dams were built in 1956 and 1961, respectively,〔''Reservoirs and Weirs in Taiwan'', pp. 107–108〕 but with their small storage capacities, power output was highly erratic. A high dam upstream would be required to control the flow through these downstream power stations. The Tachien Gorge, located about upstream from Kukuan, was regarded as an excellent dam site: an engineer surveying this location is known to have remarked, "When God created Tachien, he must have had a dam in mind."
The proposed Tachien Dam site was located at the end of a long valley where the surrounding mountains abruptly closed in to form a narrow slot canyon through which flowed the Dajia River. Here, engineers planned to build a dam high and long, supported by a large saddle dam to the west, impounding a reservoir of 554 million m3 (449,000 acre feet) – forming, respectively, the second-highest arch dam in the world at the time (after Italy's Vajont Dam) and the largest artificial lake in Taiwan.〔 The dam would support a 360 MW power station and generate over 736 million KWh per year. Of the dam's projected US$ 110 million cost, the United States provided a loan of about $40 million, while Japan would provide assistance with hydraulic gates and power-generating equipment.〔
Construction at Tachien Dam began in December 1969, with work directed and overseen by French civil engineers André Coyne and Jean Bellier.〔 Due to the remote site, economic conditions and technical issues, it was a very difficult project for Taiwan at the time, but public support made continued construction possible. The planned height of the dam was scaled down about 25 percent from the original design to , reducing the planned reservoir and power generation capacities as well. The reservoir began filling in June 1974, and the dam structure was completed in September 1974.〔 At the dedication ceremony, Chiang Kai-Shek officially named the dam "Techi", meaning "foundation of virtue". In 1975, the Republic of China issued a set of postage stamps to commemorate the completion of the project.
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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