Yamba Dam

八ッ場ダム Yamba Dam
Location	Gunma Prefecture, Japan
Coordinates	36°33′25″N 138°42′51″E
Construction began	1967
Opening date	2019
Construction cost	532 Billion Yen
Dam and spillways
Type of dam	Gravity
Impounds	Agatsuma River
Height	131 m (430 ft)
Length	336 m (1,102 ft)
Reservoir
Creates	Lake Yamba-Agatsuma
Total capacity	107,500,000 m^3 (3.80×10^9 cu ft)
Catchment area	707.9 km^2 (273.3 sq mi)
Surface area	304 hectares

Yamba Dam (八ッ場ダム, Yamba damu) is a dam in Naganohara, Agatsuma District, Gunma Prefecture, Japan. Construction began in 1967, with effective completion in October 2019[1] and the official opening on 1 April 2020.

History

Planning for the dam began in 1952, and it was planned to be completed by 2015. The dam's construction had seen sustained local opposition and a ballooning budget, and a change of National government in 2009 resulted in the project being halted, being about 70% completed at the time. Another change of government in 2012 resulted in the project being revived and subsequently completed.

Construction required the relocation of part of the Agatsuma Line, several roads and affected residents.

Test flooding of the reservoir began on 1 October 2019.[1]

Yamba Power Plant, an 11,700 kW hydroelectric station attached to the dam, began operation on 1 April 2021.[2][3]

References

This article incorporates material from the corresponding article in the Japanese Wikipedia.

1. 八ッ場ダム工事事務所. "八ッ場ダム試験湛>水を開始しました。" [Yamba Dam test flooding begins.] (PDF). 今日のやんば (Press release) (in Japanese). 国土交通省 関東地方整備局. Archived from the original (PDF) on 2022-08-04. Retrieved 2019-10-14.
2. "八ッ場発電所が完成しました" [Yamba Power Plant has been completed] (in Japanese). 群馬県. 2021-12-01. Archived from the original on 2022-01-09. Retrieved 2022-01-20.
3. "クリーンエネルギーである水力発電の拡大に貢献 群馬県企業局・八ッ場発電所の水力発電設備が竣工しました" (in Japanese). 明電舎. 2021-07-07. Archived from the original on 2021-07-07. Retrieved 2021-08-26.