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The Vaal River is the largest tributary of the Orange River in South Africa. The river has its source near Breyten in Mpumalanga province, east of Johannesburg and about 30 kilometres (19 mi) north of Ermelo and only about 240 kilometres (150 mi) from the Indian Ocean. It then flows westwards to its confluence with the Orange River southwest of Kimberley in the Northern Cape. It is 1,458 kilometres (906 mi) long, and forms the border between Mpumalanga, Gauteng and North West Province on its north bank, and the Free State on its south.
The Vaal Dam in South Africa was constructed in 1938 and lies 77 km south of OR Tambo International Airport, Johannesburg. The lake behind the dam wall has a surface area of about 320 square kilometres (120 sq mi) and is 47 meters deep. The Vaal Dam lies on the Vaal River, which is one of South Africa's strongest-flowing rivers. Other rivers flowing into the dam are the Wilge River, Klip River, Molspruit and Grootspruit. It has over 800 kilometres (500 mi) of shoreline and is South Africa's second biggest dam by area and the fourth largest by volume.
Hartbeespoort Dam is an arch type dam situated in the North West Province of South Africa. It lies in a valley to the south of the Magaliesberg mountain range and north of the Witwatersberg mountain range, about 35 kilometres north west of Johannesburg and 20 kilometres west of Pretoria. The name of the dam means "dam at the gorge of the hartebeest" in Afrikaans. This "poort" in the Magaliesberg was a popular spot for hunters, where they cornered and shot the hartebeest. The dam was originally designed for irrigation, which is currently its primary use, as well as for domestic and industrial use. The dam has suffered from a hypertrophic state since the early 1970s. Mismanagement of waste water treatment from urban zones within the Hartbeespoort Dam catchment area is largely to blame, having distorted the food web with over 280 tons of phosphate and nitrate deposits.
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.
The Phongolo River is a river in South Africa. It is a tributary of the Maputo River. It rises near Utrecht in northern KwaZulu-Natal, flows east through oPhongolo, is dammed at Pongolapoort, and crosses the Ubombo Mountains; then it flows north towards Mozambique, joining the Maputo River.
The Hennops River is one of the larger rivers that drains Gauteng, South Africa. It has its source near Kempton Park, east of Johannesburg and meets the Crocodile River shortly before Hartbeespoort Dam. It is one of Gauteng's most polluted rivers.
Roodeplaat Dam is a concrete arch dam situated in South Africa on the Pienaars River, a tributary of the Crocodile River, which flows northwards into the Limpopo River. The dam is a warm monomictic impoundment with stable thermal stratification during the summer.
The Berg River Dam is a 68-metre (223 ft) high dam on the Berg River in South Africa. It is the centerpiece of the Berg Water Project (BWP) which is designed to capture the winter rainfall and store it for supply to Cape Town during the dry summer months. The project in turn forms an important part of the Western Cape Water Supply System (WCWSS), an intricate system of dams and bulk water infrastructure that provides water to more than 3 million people. At the inauguration of the dam in 2009, then President of South Africa Kgalema Motlanthe called the project "a good example of how public infrastructure projects can be used to contribute meaningfully to poverty eradication and to foster social empowerment of the people." The Berg River Dam was the first dam in South Africa to be designed and constructed, and is due to be operated, in accordance with the guidelines of the World Commission on Dams. It has been completed on time and within budget. The Berg River basin and the adjacent metropolitan area of Cape Town are of particular importance to the Western Cape region because, although the basin generates only about 3% of the country's water resources, it is home to about 8% of South Africa's population, and produces about 12% of GDP.
Blyderivierpoort Dam is a gravity-arch dam on the Blyde River, in the lower Blyde River Canyon, near Hoedspruit in Mpumalanga, South Africa. It also floods the lower reaches of the Blyde's Ohrigstad River tributary. The dam was completed in 1974. The 71 m high dam wall and 22 m deep is situated 3 km from Swadini resort by road.
Boskop Dam is an earth-fill type dam on the Mooi River, near Potchefstroom, North West Province, South Africa. It was constructed in 1959. The main purpose of the dam is for irrigation and domestic usage. Its hazard potential is ranked as high, due to poor maintenance and the development of sink holes.
Bridle Drift Dam is a rock-fill type dam on the Buffalo River, near East London, Eastern Cape, South Africa. It was first constructed in 1969 and renovated in 1994. The purpose of the dam is for industrial and domestic use, the reservoir is now the main drinking water supply for Buffalo City.
Theewaterskloof Dam is an earth-fill type dam located on the Sonderend River near Villiersdorp, Western Cape, South Africa. Administratively it is located within Theewaterskloof Local Municipality. It was established in 1978 and is the largest dam in the Western Cape Water Supply System with a capacity of 480 million cubic metres, about 41% of the water storage capacity available to Cape Town, which has a population of over 4 million people. The dam mainly serves for municipal and industrial use as well as for irrigation purposes. The hazard potential of the dam has been ranked high (3).
Woodhead Dam is a dam on Table Mountain, Western Cape, South Africa. It was built in 1897 and supplies water to Cape Town. The dam, which was the first large masonry dam in South Africa, was designated as an International Historic Civil Engineering Landmark by the American Society of Civil Engineers in 2008.
The Sand River is a river in the Free State, South Africa. It is located close to Welkom and Virginia in the gold mining center of the Free State. Its source is located close to Tweefontein NW of Ficksburg not far from the South Africa-Lesotho border, at 28°40′49″S27°41′23″E. This river is famous because of the historical Sand River Convention signed nearby, an important event in South African political history.
The Doring River is a river in the Western Cape Province, South Africa. It is part of the Olifants/Doring River system.
Kammanassie Dam is a gravity type dam located on the Kammanassie River, near De Rust, Western Cape, South Africa. It was established in 1923. The primary purpose of the dam is to provide water for irrigation, and its hazard potential has been ranked high (3).
The Vaal River Barrage Reservoir is a dam on the Vaal River near Vanderbijlpark, border Gauteng and Free State, South Africa.
The Glen Melville Dam is a dam supplied by the Orange-Fish River Tunnel, near Grahamstown, Eastern Cape, South Africa. It was established in 1992 and its main purpose is for domestic and industrial use.
References
- ↑ "Stompdrift RQS Dams". Department of Water Affairs, Republic of South Africa. 21 May 2004. Archived from the original on 30 March 2010.
- ↑ "Dam Safety Office 2011/2012 Annual Report" (PDF). Department of Water Affairs, Republic of South Africa. p. 22. Archived from the original (PDF) on 17 June 2022. Retrieved 11 June 2013.
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