|Álvaro Obregón Dam|
Upstream side of dam in 2006
|Official name||Presa Oviáchic|
|Dam and spillways|
|Type of dam||Embankment|
|Height||57 m (187 ft)|
|Length||1,457 m (4,780 ft)|
|Total capacity||3,226,000,000 m3 (2,615,361 acre⋅ft)|
|Surface area||208 km2 (80 sq mi)|
|Operator(s)||Comisión Federal de Electricidad|
|Commission date||28 August 1957|
|Installed capacity||19 MW|
The Álvaro Obregón Dam (also known as theOviáchic Dam) is an embankment dam on the Yaqui River north of Ciudad Obregón, in Sonora, Mexico. The purpose of the dam is water supply for irrigation, flood control and hydroelectric power production. The dam supports a power station with two generators and a 19 MW installed capacity.
An embankment dam is a large artificial dam. It is typically created by the placement and compaction of a complex semi-plastic mound of various compositions of soil, sand, clay, or rock. It has a semi-pervious waterproof natural covering for its surface and a dense, impervious core. This makes such a dam impervious to surface or seepage erosion. Such a dam is composed of fragmented independent material particles. The friction and interaction of particles binds the particles together into a stable mass rather than by the use of a cementing substance.
The Yaqui River is a river in the state of Sonora in northwestern Mexico. It was formerly known as the Rio del Norte. Being the largest river system in the state of Sonora, the Yaqui river is used for irrigation, especially in the Valle del Yaqui.
Ciudad Obregón is the second largest city in the northern Mexican state of Sonora and named for Sonoran revolutionary general and president of Mexico, Álvaro Obregón. It is situated 525 km (326 mi) south of the state's northern border with the U.S. state of Arizona. It is also the municipal seat of Cajeme municipality, located in the Yaqui Valley.
Because of drought, the Álvaro Obregón Dam and others on the Sonora and Mayo Rivers were constructed in the 1940s and 1950s. Construction on the Álvaro Obregón Dam began in 1947 and was complete in 1952. The dam's power station was not operational until August 1957. 57 m (187 ft) above the riverbed and 1,457 m (4,780 ft) long. The dam has an additional saddle dam 2 km (1 mi) to its northwest and along with a system of canals, it helps irrigate 83% of a 232,999 ha (900 sq mi) area. Because of drought in the 1990s and 2000s, 2004 was the first year that water from the dam's reservoir was not authorized for irrigation.The dam is
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