|Location||Amphoe Sam Ngao, Tak Province|
|Owner(s)||Electricity Generating Authority of Thailand|
|Dam and spillways|
|Height||154 m (505 ft)|
|Length||486 m (1,594 ft)|
|Width (crest)||8 m (26 ft)|
|Total capacity||13,462,000,000 m3 (10,913,821 acre·ft)|
|Active capacity||9,762,000,000 m3 (7,914,182 acre·ft)|
|Catchment area||26,400 km2 (10,193 sq mi)|
|Surface area||300 km2 (116 sq mi)|
|Turbines||6 x 76.5 MW Francis-type, 1 x 115 MW Pelton-type, 1 x 175 MW Francis pump-turbine|
|Installed capacity||749 MW|
The Bhumibol Dam (formerly known as the Yanhi Dam) is a concrete arch dam on the Ping River, a tributary of the Chao Phraya River, in Amphoe Sam Ngao district of Tak Province, Thailand. It is located about 480 km (298 mi) north of Bangkok and was built for the purposes of water storage, hydroelectric power production, flood control, fisheries and saltwater intrusion management. The dam was named after King Bhumibol Adulyadej and was Thailand's first multi-purpose project.
The Bhumibol Dam among others in the Chao Phraya basin were constructed beginning in the 1950s to exploit the agricultural and hydroelectric potential of the basin. Construction on the dam began in 1958 and was finished in 1964 while the reservoir was completely filled in 1970. The first two generators were commissioned in 1964. In 1972, the Sirikit Dam was completed on the Nan River, one of two major tributaries of the Chao Phraya including the Ping. The Bhumibol and Sirkit Dams control 22% of the Chao Phraya's annual runoff combined. Both dams also help provide for the irrigation of 1,200,000 ha (4,633 sq mi) in the wet season and 480,000 ha (1,853 sq mi) in the dry season.
During the 2011 Thailand floods, rainfall for March 2011 over the area of northern Thailand was an extraordinary 344% above normal. Bhumibol Dam in particular got 242.8 millimetres (9.56 in) of rain, 224.7 millimetres (8.85 in) above the mean of 25.2 millimetres (0.99 in) and since 1 January had accumulated 245.9 millimetres (9.68 in), 216 millimetres (8.5 in) or 186% above normal.
The dam is an arch-gravity type and is 154 m (505 ft) tall, 486 m (1,594 ft) long and 8 m (26 ft) wide at its crest. It withholds a reservoir of 13,462,000,000 m3 (10,913,821 acre·ft) of which 9,762,000,000 m3 (7,914,182 acre·ft) is active or "useful" storage. The dam's catchment area is 26,400 km2 (10,193 sq mi) while its surface area is 300 km2 (116 sq mi). The Lower Mae Ping Dam is 8 m (26 ft) high, 300 m (984 ft) long and has a storage capacity of 5,000,000 m3 (4,054 acre·ft). In off-peak hours, the one pump-turbine returns water back into the Bhumibol (upper) reservoir and when demand is high, the pump serves as a generator for power production.
The power plant contains eight turbines for an installed capacity of 749 megawatts (1,004,000 hp). Six are 76.5 megawatts (102,600 hp) Francis-type, one is a 115 megawatts (154,000 hp) Pelton turbine and one is a 175 megawatts (235,000 hp) Francis pump-turbine.
The dam's power house underwent extensive upgrades and renovations in the 1990s.
- "Bhumibol Dam Mountain Bike Championship–Challenge Meets Sanook (Fun)". Thailand Travel Online. Retrieved 14 March 2011.
- "Hydroelectric Power Plants in Thailand". Industcards. Retrieved 6 March 2011.
- "Chao Phraya River Basin (Thailand)". UNESCO. p. 392. Retrieved 6 March 2011.
- "Bhumibol Dam". Royal Irrigation Department - Thailand. Retrieved 6 March 2011.
- "Bhumibol Dam, Thailand". Sustainable Hydropower. Retrieved 6 March 2011.
- Bangkok Pundit (Nov 3, 2011). "The Thai floods, rain, and water going into the dams – Part 2". Asian Correspondent. "Monthly Current Report Rainfall and Accumulative Rainfall March 2011. Source: Thai Meteorological Department"
|Wikimedia Commons has media related to Bhumibol Dam.|
- Bhumibol Dam at Electricity Generating Authority of Thailand