Orange-Fish River Tunnel

Orange-Fish River Tunnel

The Orange-Fish River Tunnel is a 82.8 km irrigation tunnel in South Africa which diverts water from the Orange River under the Suurberg mountain plateau to the Great Fish River and the semi-arid areas of Eastern Cape province. [http://www.halcrow.com/html/our_projects/projects/orange_tunn.htm]

Its inlet takes water from the Gariep Dam at Oviston: the name "Oviston" is an acronym based on the Afrikaans "Oranje-VISrivier TONnel". With a maximum capacity of 54 m3, it supplies to the Teebus Spruit and the Great Brak River and from there to the valleys of the Great Fish River and the Sundays River. It is the longest continuous enclosed aqueduct in the southern hemisphere and the second-longest water supply tunnel in the world. [http://www.dwaf.gov.za/orange/Mid_Orange/orange-f.htm]

Construction started in 1966 and the tunnel opened in 1975.

References


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