|Official name||Presa Limon
Proyecto Especial Olmos Tinajones (PEOT)
|Dam and spillways|
|Type of dam||Embankment, concrete-face rock-fill|
|Height||43 m (141 ft)|
|Length||320 m (1,050 ft)|
|Total capacity||44×106 m3 (36,000 acre⋅ft)|
|Active capacity||300×106 m3 (240,000 acre⋅ft)|
|Surface area||275 ha (680 acres)|
|Installed capacity||600 MW (800,000 hp) (max. planned)|
|Annual generation||4,000 GWh (14,000 TJ) (est.)|
The Limón Dam, part of the Olmos Transandino Project, is an under construction multi-purpose concrete-face rock-fill embankment dam on the Huancabamba River in northwestern Peru, located to the south of Guabal. When completed, the project will help produce 4,000 gigawatt-hours (14,000 TJ) of electricity per year and transfer water from the Cajamarca region west to Lambayeque, near Olmos for the reclamation and irrigation of 43,500 hectares (107,000 acres) of farmland. The greatest feature and engineering challenge of the project was digging the 20-kilometre (12 mi) trans-Andean tunnel as it connects the Atlantic side of the Andes (Amazon basin) with the Pacific side.
History and construction
The idea to divert the Huancabamba River to the fertile lands of Olmos was first envisioned in 1924. The hydroelectric component was added in the 1940s and 1950s. Preliminary feasibility studies were conducted in the 1960s by Italconsult, in 1979-1982 soviet engineers from Hydroproject prepared and approved new design Tunnel excavation had been occurring since the 1950s and through the 1970s but work was halted in the 1980s due to a lack of funding. Construction on the project began in 2006 with the dam and Brazil's Odebrecht drilling the tunnel with a tunnel boring machine (TBM). Of the tunnel's 20 kilometres (12 mi) total length, 12.5 kilometres (7.8 mi) is being dug with a TBM. The dam was completed in 2009 and its reservoir began to impound the river. The tunnel was completed on 20 December 2011 with a ceremony attended by Peru's President Ollanta Humala. In June 2010, H2Olmos S.A. was awarded the contract for the irrigation system and it is expected to be operational in 2013. The contract for the hydroelectric component, which is planned to consist of two power stations, was awarded to Sindicato Energético S.A. in June 2010.
The water transfer accomplished by the Limón Dam on the Huancabamba River will divert up to 2.05 million cubic metres (1,660 acre⋅ft) of water a year through the 20-kilometre (12 mi) Olmos Transandino tunnel to the Olmos River Valley. The Limón Dam is a 43-metre (141 ft) high, 320-metre (1,050 ft) long embankment dam that creates a reservoir of impounding 44 million cubic metres (36,000 acre⋅ft). Water diverted by the dam is transferred via the tunnel to the Olmos River where it will be used to irrigate 5,500 hectares (14,000 acres) of land. From there, water continues down the Olmos River where at two points, it will be used at hydroelectric power stations. At the base of the valley, water will settle in the Palo Verde Reservoir which will have a storage capacity of 790 million cubic metres (28×109 cu ft). The Palo Verde Dam will serve as a diversion dam and shift water from the reservoir to the remaining 38,000 hectares (94,000 acres) of farmland.
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