Andekaleka Dam

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Andekaleka Dam
Andekaleka Dam is located in Madagascar
Andekaleka Dam
Location of Andekaleka Dam in Madagascar
CountryMadagascar
LocationAndekaleka, Analamanga Region
Coordinates18°47′39.02″S 48°37′09.49″E / 18.7941722°S 48.6193028°E / -18.7941722; 48.6193028Coordinates: 18°47′39.02″S 48°37′09.49″E / 18.7941722°S 48.6193028°E / -18.7941722; 48.6193028
PurposePower
StatusOperational
Construction began1978
Opening date1982
Construction costUS$142.1 million
Owner(s)Jirama
Dam and spillways
Type of damGravity
ImpoundsVohitra River
Height10 m (33 ft)
Length125 m (410 ft)
Andekaleka Hydroelectric Power Station
Coordinates18°48′12.20″S 48°39′20.03″E / 18.8033889°S 48.6555639°E / -18.8033889; 48.6555639
Commission date1982, 2012
Hydraulic head235 m (771 ft)
Turbines2 x 29 MW (39,000 hp), 1 x 33 MW (44,000 hp) Francis-type
Installed capacity91 MW (122,000 hp)

The Andekaleka Dam is a gravity dam on the Vohitra river near Andekaleka in eastern Madagascar. The primary purpose of the dam is hydroelectric power generation and it diverts water from the Vohitra east into a 4 kilometres (2.5 mi) headrace tunnel where it reaches a 91 megawatts (122,000 hp) underground power station. After water charges the turbine-generators, it travels down a 500 metres (1,600 ft) tailrace tunnel before it reenters the Vohitra River. The drop in elevation between the dam and power station affords a hydraulic head of 235 metres (771 ft).[1][2] The dam and power station were funded by the World Bank at a cost of US$142.1 million. It was constructed between 1978 and 1982.[3] The power station can house up to four generators. The first two were operational in 1982 and a third in 2012.[4] Generator one and two host Vevey and Jeumont turbines while the third is made by HEC.[5][6] They all use Francis reaction turbines [7] which typically range from 10 to 700MW [8] and with water head operating from 10 to 600 meters [9]

References[]

  1. ^ "Andekaleka Hydroelectric Project" (PDF). World Bank. 18 May 1978. Retrieved 18 March 2014.
  2. ^ Humphries, R. W. (1985). "Underground design at Andekaleka Hydroelectric Development". Canadian Geotechnical Journal. 22: 25–31. doi:10.1139/t85-004.
  3. ^ "Andekaleka Hydroelectric Project Completion Report" (PDF). World Bank. 27 December 1991. Retrieved 18 March 2014.
  4. ^ "Inventaire du parc hydroélectrique existant - Juin 2013" (in French). ORE. June 2013. Archived from the original on 2014-03-18. Retrieved 18 March 2014.
  5. ^ "Harbin Electric".
  6. ^ "Small HydroResource Mapping in Madagascar INCEPTION REPORT" (PDF). World Bank. August 2014. Retrieved 17 June 2020.
  7. ^ "How Francis Turbines Work (Hydropower) in 3D".
  8. ^ "Francis Turbine Virtual Tour - SolidWorks 3D CAD".
  9. ^ "Francis Water Head Requirement".
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