A major building for dam construction, it has a dual purpose: energy production and irrigation. It is considered to be the highest vault dam in Africa and the largest in Morocco in energy production. Besides its ability irrigation on the plain of Tadla , who belongs to the pre-Atlas inland plain of Tadla ( 3500 km 2 ), extended in the region of Marrakech -Tensift-Al Haouz by the plain of Sraghna. The dam made it possible to develop 69,500 ha of fertile land over 125 km in length. The policy of the Moroccan government in the early 1960s was to achieve irrigation, Million hectares. Despite the large network of dams, Morocco is confronted with certain problems: drought, and the filling of dams by mud, which has an influence on the retention of water.
At the beginning of 1948 , the SGE and the Enterprise Fougerolle for Public Works ranked first in the awarding of the works of this great Moroccan dam. In order to execute the contract, they form an ad hoc company, the Bin-el-Ouidane Factory Construction Company (ECBO). Located on the main tributary of the Oum Errabiaa , Oued el-Abid, the project is ambitious since it must allow the realization of the most powerful hydropower in Morocco. As early as 1929, studies were carried out on the site. On the eve of the Second World War, the Electrical Energy of Morocco and the public authorities decided to carry out this development. However, the work does not enter into their active phase until after the conflict. In total, the Oued el-Abid complex is to provide 600 billion kilowatt-hours , or two-thirds of Morocco's hydropower. In addition, it will be possible to irrigate 112 000 ha . The Bin-el-Ouidane dam, studied by the Coyne and Bellier bureau , is 132 m high and 290 centimeters long and remains the highest in Africa. Provided with a large spillway in ski jump with a capacity of 2,500 m 3 / s , it determines, once built, a reservoir of an area far exceeding that of Lake Annecy .
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