Abstract

La construction d'une installation hydroelectrique souterraine de 150 MW comprend le percement de plus de 9 km de tunnel dans de la roche dure et un hall de machine de 100 m de long et 16 m de large. L'acces pour la construction du barrage dans une gorge etroite de la riviere Alta ne peut etre effectue que par helicoptere et par un tunnel en spirale de 1,2 km. Des installations speciales sont faites pour proteger les saumons

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