| Sup'ung Dam | |
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| Country | People's Republic of China/North Korea |
| Location | Liaoning Province/North Pyongan. |
| Coordinates | |
| Status | Operational |
| Construction began | 1937 |
| Opening date | 1943 |
| Dam and spillways | |
| Type of dam | Gravity |
| Height | 106 m (348 ft) |
| Length | 899.5 m (2,951 ft) |
| Crest elevation | 126.4 m (415 ft) |
| Type of spillway | Main: 26 x sluice gates Auxiliary: 16 x sluice gates |
| Spillway capacity | Main: 37,650 m3/s (1,329,597 cu ft/s) Auxiliary: 17,046 m3/s (601,974 cu ft/s) |
| Reservoir | |
| Creates | Sapung Lake |
| Capacity | 14,600,000,000 m3 (11,836,413 acre·ft) |
| Active capacity | 7,900,000,000 m3 (6,404,634 acre·ft) |
| Inactive capacity | 4,180,000,000 m3 (3,388,781 acre·ft) |
| Catchment area | 52,912 km2 (20,429 sq mi) |
| Surface area | 274 km2 (106 sq mi) |
| Normal elevation | 123 m (404 ft) |
| Power station | |
| Operator(s) | Korea-China Hydroelectric Co |
| Commission date | 1941 |
| Hydraulic head | 77 m (253 ft) |
| Turbines | 6 x 105 MW Francis-type 2 x 67.5 MW Francis-type |
| Installed capacity | 765 MW |
The Sup'ung Dam, also referred to as the Shuifeng Dam and previously the Sui-ho Dam, is a gravity dam on the Yalu River straddling the border between Liaoning Province in the People's Republic of China and North Pyongan province in North Korea. The dam was constructed by the Japanese between 1937 and 1943 in order to generate electricity and has been repaired and renovated several times throughout the years, mainly due to spillway damage from flooding. During the Korean War though, the dam was bombed by the United Nations Command three separate times in order to disrupt power generation. At the time of its completion, the dam was the largest in Asia and is still the largest hydroelectric power station on the Yalu River. Power produced at the dam's main 630 MW power station is evenly shared between China and North Korea.
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In 1937, during Japan's colonization of Korea, the Yalu Hydroelectric Company was established and in the same year construction began on the dam. In 1941, the dam was complete and two of the 100 MW generators were operational. Four more generators were later operational in 1945. The seventh generator was German-made and not delivered due to shipping difficulties during World War II. At the time of its completion, the dam was the largest in Asia and second largest in the world. Power from the dam was used throughout the Korean peninsula and southern Manchuria (Manchukuo at the time).[1][2] After World War II, in 1947, the Soviet Untion occupied the area and dismantled three of the generators. They would later be re-installed during the 1950s.[3]
The dam's power station and transformer yard were targeted by the United Nations Command three times during the Korean War in order to disrupt power supply. Between 23 and 24 1952, the dam was attacked by 250 bombers and fighters, dropping 90 tons of munitions on the power station, transformer yard and auxiliary facilities. The power station was destroyed but the dam left intact. After intelligence indicated it may have been partially operational again, the power station was again targeted and disabled on 12 September 1952 by B-29 bombers. By 1 February 1953, it was believed that two generators had been repaired and were operational once again. This resulted in a third raid on the dam on 15 February which left the power station inoperable once again.[3]
Throughout the dam's history, it underwent several renovations and repairs. Flooding in 1946 damaged the stilling basin at the toe of the dam and destroyed its spillway, requiring repairs the next year. Between September 1949 and April 1950, in a second repair, the spillway and plunge pool were renovated. Between 1955 and 1958, permanent post-war repairs were made to the dam and power station. The generators removed by the Soviets were replaced and the installed capacity of the power station upgraded to 630 MW.[4] In 1983, China began constructing an additional power station just downstream of the dam on their side of the river with two 67.5 MW generators. The first was commissioned in 1987 and the second in 1988.[5] The most recent renovation occurred between 2009 and 2011 in order to improve the function of the dam's spillways. The US$24.5 million renovation was funded by China's State Grid Corporation.[6]
The Supung is a 106 m (348 ft) tall and 899.5 m (2,951 ft) long concrete gravity dam with a crest elevation of 126.4 m (415 ft). The dam's spillway consists of 26 sluice gates with a maximum discharge capacity of 37,650 m3/s (1,329,597 cu ft/s). An auxiliary spillway 1.7 km (1 mi) north of the dam consists of 16 sluice gates and has a maximum discharge capacity of 17,046 m3/s (601,974 cu ft/s). The dam's reservoir has a capacity of 14,600,000,000 m3 (11,836,413 acre·ft) of which 7,900,000,000 m3 (6,404,634 acre·ft) is active (or "useful") for power generation. The dam sits at the head of a 52,912 km2 (20,429 sq mi) catchment area and its reservoir has a surface area of 274 km2 (106 sq mi). The original power station at the base of the dam contains seven 105 MW Francis turbine-generators which are afforded and average hydraulic head of 77 m (253 ft).[4][7] The additional power station on China's side contains two 67.5 MW Francis turbine generators. The total installed capacity of the dam's power stations is 765 MW.[5]