The Gariep Dam is located in South Africa, near the town of Norvalspont, bordering the Free State and Eastern Cape provinces. Its primary purpose is for irrigation, domestic and industrial use as well as for power generation. It is the largest dam in South Africa.
Name
The Gariep Dam, at its commission in 1971, was originally named the Hendrik Verwoerd Dam after Hendrik Verwoerd, the Prime Minister before and after 31 May 1961, when the country changed from the Union of South Africa to the Republic of South Africa. However, after the end of apartheid, the Verwoerd name was considered unsuitable. The name was officially changed to Gariep Dam on 4 October 1996. Gariep is Khoekhoe for "river", the original name of the Orange River (the longest river in South Africa).
Location
The dam is on the Orange River about north-east of Colesberg and south of Bloemfontein. It is in a gorge at the entrance to the Ruigte Valley some east of Norvalspont. The dam crest is some above sea level.
Dimensions
The wall is 88 m high and has a crest length of 914 m and contains approximately 1.73 million m3 of concrete. The Gariep Dam is the largest storage reservoir in South Africa. In South African English, 'dam' refers both to the structure and the water volume it retains. Gariep Dam has a total storage capacity of approximately and a surface area of more than when full. The hydro-electrical power station houses four 90-MW generators.
Design type and contractors
The structure is a concrete gravity-arch hybrid dam. This design was chosen as the gorge is too wide for a complete arch so flanking walls form gravity abutments to the central arch.
It was built by Dumez, a French construction company.
Gariep Dam Bridge
Rivers and spruits flowing into the dam
Orange RiverDept of Water Affairs website Caledon River Brakspruit Broekspruit Oudagspruit Palmietspruit Slykspruit
Water consumption, outflow, derivative usages and diversions
It must be carefully managed by balancing the supply-and-demand of this water resource usage for its derivatives of electricity generation, irrigation, and municipal drinking water. There is trade off in the water usage for electricity and inter-basin transfer for water in other areas like Port Elizabeth.
Orange–Fish Water Scheme
The scheme diverts water from the Orange River to the Great Fish River valley. Great Fish River Valley, then via Grassridge Dam, ElandsDrift Wier, Cookhouse Tunnel, De MistKraal Weirhttps://www.gfrwua.com/orange-river-project | Great Fish River Water Users Association since 1920 into Sundays River Valley (Canals and Tunnels Scheme) North-West of Port Elizabeth, then via Darlington Dam, Korhaansdrift Weir, Canal, Scheepersvlakte Balancing Dam,https://www.gfrwua.com/orange-river-project Great Fish River Water Users Association since 1920 Bulk water Pipelinehttp://www.dwa.gov.za/orange/Mid_Orange/fish-sun.htm Department of Water - Fish-Sundays to Port Elizabeth, Nooitgedracht Water Treatment Works, since 1992 with water from the Sundays River Valley (See External links for more video documentaries on construction and drone footage for canal system.)
Orange-Fish River Tunnel
At Oviston, on the south bank of the reservoir, is the inlet of the Orange-Fish River Tunnel, allowing water to be diverted to the Great Fish River and most of the Eastern Cape's western parts.
Gariep hydroelectric power plant
A 360-MW hydroelectric power plant is one is run by Eskom. Four 90-MW hydro turbines (which are remotely controlled from Gauteng)
Gallery
See also
List of rivers of South Africa List of reservoirs and dams in South Africa
References
External links
Videos - Opening | Documentaries | Construction
Official Opening of the Orange River Dam in South Africa on YouTube Short Documentary on the dam construction and motivations thereof (1 of 3 planned dams) on YouTube History of the town Construction on YouTube Orange-Fish River Tunnel Basin Transfer Schema Construction 1972 - Technical illustrations & diagrams(Port Elizabeth) on YouTube Orange-Fish River Tunnel Basin Transfer Schema Construction - Footage on YouTube History of the construction and where it all started, rainfall, diagrams, extra Orange River Transfer Scheme to Port Elizabeth Documentary - Nooitgedracht Water Treatment Works on YouTube (Carte Blanche) The excavation of the Orange-Fish Tunnel ORANGE / FISH & LOWER SUNDAYS RIVERWATER SUPPLY SCHEMES Part 1 | From the towering inlet to the town that disappeared forever | Oviston to Midshaft Part 2 | The road that time simply forgot | The Bulhoek Pass Part 3 | Ghost town of empty houses and empty swimming pools | Teebus to The Outlet
Videos - Aerial | Presentation
Full Flood over gates January 2000 on YouTube 4K Aerial footage of Dam, bridge, campsite, amenities on YouTube 4K Aerial footage not in flood on YouTube
Other
Gariep Dam - Roots - Largest in the Country - Construction Posters, Origins and Designs from inside the dam wall Gariep Hydroelectric Power Station on the Eskom-Website