Lake Mead is one of the largest artificial lakes of the Unites States. It is formed by the Hoover dam, which dams the Colorado river at a few kilometres from Las Vegas.

The project involved the construction of a system for collecting and transporting the waters of Lake Mead, located approximately 30 kilometres south-east of the city of Las Vegas (Nevada), in order to increase the supply of water, approximately 4.5 million cubic metres per day, for drinking and domestic use in the urban area of Las Vegas.

The works involved the construction of an access shaft, excavated in the rock on the shore of the lake, approximately 200 m deep and with a diameter of 9 m. A tunnel was constructed at the bottom of the shaft under the lake bed approximately 4,600 m long and with an excavation diameter of 7.2 m. The intake work is located at the end of the tunnel, approximately 100 metres below the surface of the lake, made from a pipe-shaped tubular steel structure with a diameter of 6 m and a height of approximately 30 m.

The water, drawn in from the bottom of the lake through the intake work openings, is directed along the tunnel to the access shaft, from where it is pumped to the treatment plant on the surface.

To view the video please click here https://www.youtube.com/watch?v=jPzApoMGYDI – Press release from Salini Impregilo.