Gariep Dam
| Gariep Dam | |
|---|---|
 Gariep Dam | |
| Official name | Gariep Dam |
| Location | Border of Eastern Cape and Free State, South Africa |
| Coordinates | 30°37′25.43″S 25°30′23.81″E / 30.6237306°S 25.5066139°ECoordinates: 30°37′25.43″S 25°30′23.81″E / 30.6237306°S 25.5066139°E |
| Construction began | 1965 |
| Opening date | 1971 |
| Owner(s) | Department of Water Affairs |
| Dam and spillways | |
| Type of dam | Arch-gravity dam |
| Impounds | Orange River |
| Length | 914 m |
| Height | 88 m |
| Reservoir | |
| Creates | Gariep Dam Reservoir |
| Total capacity | 5,340,000 megalitres (5,340 hm3)[1] |
| Surface area | 374 km2 |
| Power station | |
| Operator(s) | Eskom |
| Turbines | 4 |
| Installed capacity | 90 MW each |
| Annual generation | 889 GWh[2] |
  Gariep Dam | |
Gariep Dam is a dam 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.
Name
The Gariep Dam was originally named the Hendrik Verwoerd Dam after the first prime minister of the Republic of South Africa Hendrik Verwoerd on its commission in 1971. 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 San for "Great water", the original name of the river.
Location
The dam is on the Orange River about 48 km north-east of Colesberg and 208 km south of Bloemfontein. It is in a gorge at the entrance to the Ruigte Valley some 5 km east of Norvalspont.
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 lake it impounds. Gariep Dam has a total storage capacity of approximately 5,340,000 megalitres (5,340 hm3) and a surface area of more than 370 square kilometres (140 sq mi) when full. The hydro-electrical power station houses four 90 MW generators, giving a maximum output of 360 MW of electricity at a water flow rate of 800 m³/s.
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.[3]
Rivers and spruits flowing into the dam[4]
- Orange River
- Caledon River
- Brakspruit
- Broekspruit
- Oudagspruit
- Palmietspruit
- Slykspruit
Orange-Fish River Project
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.
Gallery
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Gariep Dam overflowing in January 2011
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Sunset at Oviston Nature Reserve on the dam's southern shores
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.JPG)
Road sign heading for the dam wall
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.JPG)
View over the lake
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.JPG)
Forever Holiday Resort at Gariep Dam
See also
- Oviston Nature Reserve, located on the southern side of the reservoir
- Orange River
- Eskom
- List of rivers of South Africa
- List of reservoirs and dams in South Africa
References
- ↑ "State of Dams in Provinces as on 20080901". Department of Water Affairs and Forestry. Retrieved 2008-09-07.
- ↑ Eskom website
- ↑ Vinci website: Hendrik Verwoerd Dam
- ↑ Dept of Water Affairs website
 |
Waterkloof 43 km | Springfontein 47 km | Bethulie 54 km | |
| Norvalspont 9 km |  |
Oviston 47 km Venterstad 45 km | ||
| ||||
 | ||||
| Colesberg 48 km Middelburg EC 133 km |
Steynsburg 101 km | Burgersdorp 111 km |
