The rehabilitation of the chute was stipulated by the need to secure normal and stable operation of one of the largest HPP on the Hrazdan River after the destruction of the active chute as a result of a landslide down the hill, on the slope of which it was situated. The works on the new route were conducted on the mountainside with a slope from 28° to 32°. The works on the route in mountainous terrain required the application of special engineering solutions and technological schemes.