El Kansera Dam
| EL Kansera | |
|---|---|
 Reservoir al Kansara | |
  Location of EL Kansera in Morocco | |
| Country | Morocco |
| Coordinates | 34°02′30″N 5°54′26″W / 34.041583°N 5.907346°W |
| Purpose | Irrigation water storage |
| Construction began | 1927 |
| Opening date | 1935 |
| Dam and spillways | |
| Height | 68 m (223 ft)[1] |
| Reservoir | |
| Total capacity | 227×106 m3 (184,000 acre⋅ft) |
| Catchment area | 4,500 km2 (1,700 sq mi) |
| Power Station | |
| Operator(s) | Office National de L'Electricite (ONE) |
| Commission date | 1946 |
| Turbines | 1 x 8.3 MW (11,100 hp) Francis-type |
| Installed capacity | 8.3 MW[2] |
EL Kansera is an irrigation storage dam in Morocco.
Location
[edit]El Kansera is the oldest irrigation storage dam in Morocco. It lies northwest of the city of Meknes and about 20 kilometres (12 mi) south of Sidi Slimane, upstream from Dar bel Amri. The dam impounds the Oued Beht (or Beth), the last major tributary of the Sebou River before its mouth. The watershed that supplies the dam has an area of 4,500 square kilometres (1,700 sq mi). The climate is temperate, and average annual rainfall is 620 millimetres (24 in).[3]
The site of the dam was a deep, narrow gorge that the Beth had cut through the limestone bordering on the lowlands. Winter floods of the Beth had created large merdjas on the Sebou's left bank, which would be ideal for cultivation once irrigation water was available.[4]
Construction
[edit]At first the colonial agriculture and public works administrations opposed construction of this and other dams, but the main settlers, led by Gaston Lebault, pushed the project forward. When governor-general Théodore Steeg arrived in 1925, known as the "water governor", the pace accelerated.[5] El Kansera was built between 1927 and 1935.[3] In 1928 Steeg's administration created a new colonization zone ("perimeter") located between Petitjean and Sidi Slimane. The land was taken from the Cherardas, who were moved to less productive areas. The new perimeter was sited where water from the dam could be used in irrigation.[6]
The main construction work was undertaken between 1931 and 1934.[7] The dam was built by Société Générale d'Enterprises, a French company.[8] François de Pierrefeu was the prime contractor.[9] Henri Prost (1874-1959) was the architect for the power station, which was completed in 1934.[10] The dam was 51 metres (167 ft) high, with a storage capacity of 225,000,000 cubic metres (7.9×109 cu ft). It would control flooding of the Beht and irrigate 30,000 hectares (74,000 acres) of fertile land in the Rharb plain. The hydroelectric plant at the base would generate 13 million KWh annually.[7] The concrete structure was built on calcareous marl, which caused great difficulty in construction.[3]
Later development
[edit]The government did not plan ahead for the way the irrigation water would be used.[11] World War II (1939-1945) caused further delays in development.[12] As of 1953 only 10,000 hectares (25,000 acres) of land was in fact being irrigated since the distribution system was still incomplete. This lack of planning is a serious problem in a region where silting imposes a finite lifespan on any storage dam.[13] The irrigated region was almost entirely in the hands of the colonists.[14] By 1969 28,000 hectares (69,000 acres) were being irrigated.[5]
The dam was raised by 6 metres (20 ft) in 1968, which increased the volume of the reservoir to 297,000,000 cubic metres (1.05×1010 cu ft). This compensated for silting, improved flood control, increased the irrigated area by 2,700 hectares (6,700 acres) and allowed for an increase in electricity production to 33 million kWh annually. The job was complicated by the difficulty of conducting deep excavation near the foundation and problems with making the new concrete bond to the old. The design included addition of 77 steel cables under a tension of 240 tonnes each. Soon after completion, in February 1969 it withstood a major flood and a simultaneous earthquake.[3]
See also
[edit]
References
[edit]Citations
- ^ "Dams" (in French). Ministry Delegate to the Minister of Energy, Mines, Water and Environment-charge of Water. Archived from the original on 5 December 2013. Retrieved 10 February 2014.
- ^ "Hydroelectric Power Plants in Morocco". Indust Cards. Archived from the original on 18 July 2009. Retrieved 10 February 2014.
- ^ a b c d El Kansera: Ministère.
- ^ Davis 1987, p. 52.
- ^ a b Perennes 1993, p. 297.
- ^ Davis 1987, p. 81-82.
- ^ a b D'Angio 1995, p. 232.
- ^ D'Angio 1995, p. 293.
- ^ James 2008, p. 210.
- ^ Usine hydroélectrique, El Kansera.
- ^ Davis 1987, p. 83.
- ^ Davis 1987, p. 131.
- ^ Dumont 1964, p. 200.
- ^ Perennes 1993, p. 145.
Sources
- D'Angio, Agnès (1995). Schneider & Cie et les travaux publics: 1895-1949. Librairie Droz. ISBN 978-2-900791-13-4. Retrieved 2013-07-05.
- Davis, John (1987). Libyan Politics Tribe and Revolution: An Account of the Zuwaya and Their Government. I.B.Tauris. ISBN 978-1-85043-043-8. Retrieved 2013-07-05.
- Dumont, René Fernand (1964). Types of Rural Economy Studies in World Agriculture. Taylor & Francis. GGKEY:HJN9APNJTES. Retrieved 2013-07-05.
- "El Kansera". Ministère de l'Energie, des Mines, de l'Eau et de l'Environnement- Département de l'Eau. Archived from the original on 2013-12-05. Retrieved 2013-07-05.
- James, Marie-France (2008-09-22). "PIERREFEU, François de". Ésotérisme et christianisme autour de René Guénon: ésotérisme, occultisme, franc-maçonnerie et christianisme aux XIXe et XXe siècles; explorations bio-bibliographiques. Fernand Lanore. ISBN 978-2-85157-376-6. Retrieved 2013-07-05.
- Perennes, Jean Jacques (1993). L'Eau et les hommes au Maghreb: contribution à une politique de l'eau en Méditerranée. KARTHALA Editions. ISBN 978-2-86537-357-4. Retrieved 2013-07-05.
- "Usine hydroélectrique, El Kansera (Maroc)". Cité de l'architecture et du patrimoine. Ministère de la culture et de la communication. Archived from the original on 2016-03-03. Retrieved 2013-07-05.