Unbong Dam

Unbong Dam/Yunfeng Dam
Unbong Dam/Yunfeng Dam
	View of the reservoir from the Chinese-side of the dam
	Location of Unbong Dam/Yunfeng Dam in China
Official name	운봉댐,운봉수력발전소,云峰水电站
Country	China/North Korea
Location	Ji'an/Chasŏng
Coordinates	41°22′51″N 126°30′52″E / 41.38083°N 126.51444°E
Status	Operational
Construction began	1959
Opening date	1965
Dam and spillways
Type of dam	Concrete gravity
Impounds	Yalu River
Height	113.75 m (373 ft)
Length	828 m (2,717 ft)
Elevation at crest	321.75 m (1,056 ft)
Spillway type	Overflow, 21 gates
Spillway capacity	21,900 m3/s (773,391 cu ft/s)
Reservoir
Total capacity	3,895,000,000 m3 (3,157,728 acre⋅ft)
Active capacity	2,662,000,000 m3 (2,158,119 acre⋅ft)
Catchment area	17,572 km2 (6,785 sq mi)
Normal elevation	318.75 m (1,046 ft)
Power Station
Commission date	1965-67
Hydraulic head	89 m (292 ft) (design)
Turbines	4 x 100 MW Francis-type
Installed capacity	400 MW

The Unbong Dam, or Yunfeng Dam, is a concrete gravity dam on the Yalu River which borders China and North Korea. It is located 33 km (21 mi) northeast of Ji'an in Jilin Province, China and Chasŏng in Chagang Province, North Korea. The primary purpose of the dam is hydroelectric power generation and it supports a 400 MW power station. Construction of the dam had initially began in August 1942 but was halted in 1945 after the surrender of Japan ending World War II.^[1] In October 1959, construction on the dam recommenced and in September 1965, the first of the four 100 MW Francis turbine-generators was operational. The last generator was operational on 4 April 1967. The 113.75 m (373 ft) tall dam creates a reservoir with a storage capacity of 3,895,000,000 m³ (3,157,728 acre⋅ft). The dam's spillway is an overflow type with 21 floodgates and has a maximum discharge of 21,900 m³/s (773,391 cu ft/s). The dam is located before a bend in the river and its power station is located on the other side of a ridge that meets the dam's right abutment. Water is delivered to the power station via two tunnels, 775 m (2,543 ft) and 759 m (2,490 ft) long. Generators 1 and 3 deliver power to China while 2 and 4 deliver to North Korea.^[2]^[3]

References[edit]

^ "Yunfeng Hydropower" (in Chinese). Neidri. Retrieved 5 September 2011.^{[dead link]}
^ "Yunfeng Hydropower" (in Chinese). Zhejiang College of Water Conservancy and Hydropower. Archived from the original on 1 August 2014. Retrieved 5 September 2011.
^ "China's highest Concrete Gravity Dams". Chinese National Committee on Large Dams. Retrieved 5 September 2011.

[1] "Yunfeng Hydropower" (in Chinese). Neidri. Retrieved 5 September 2011.^{[dead link]}

[2] "Yunfeng Hydropower" (in Chinese). Zhejiang College of Water Conservancy and Hydropower. Archived from the original on 1 August 2014. Retrieved 5 September 2011.

[3] "China's highest Concrete Gravity Dams". Chinese National Committee on Large Dams. Retrieved 5 September 2011.

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[2]

[3]

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