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GeoJournal

, Volume 2, Supplement 2, pp 29–40 | Cite as

Utilising South Africa's largest river: The physiographic background to the Orange River scheme

  • Swanevelder C. J. 
Article
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Abstract

The Orange River, with an average annual runoff of 11 500 million m3, is the largest among South Africa's rivers, drains 48% of the total area of the country and provides for 22% of the total South African downflow. Not only does the average annual precipitation of the drainage basin vary from 2 000 mm in the upper reaches to 40 mm at the river's mouth in the Atlantic, but large deviations from the average are the rule rather than the exception over most of the area. The correspondingly low reliability in the discharge of the Orange master stream is demonstrated by a 0,6 coefficient of variability. For utilising the river's water efficiently, periodic and seasonal runoff deficits may be overcome by building large storage dams. This is the purpose of the H.F. Verwoerd Dam, near the confluence of the Caledon and the Orange Rivers, and the P.K. le Roux Dam 130 km lower downstream. They form part of the R490 million (1974 estimate) Orange River Project by which water is stored and distributed in canals and tunnels (one 82 km long) reaching beyond the basin boundaries to Bloemfontein in the north and Port Elizabeth in the south. The implementation of the Orange River and Tugela-Vaal Schemes shifted the spatial focus of water development upstream along the Orange, Caledon and Vaal Rivers towards the plateau blocks of Lesotho.

Keywords

Drainage Basin Average Annual Precipitation Annual Runoff Large Storage Basin Boundary 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Anonymous: Taming a River Giant. Department of Information. Pretoria 1971.Google Scholar
  2. Anonymous: Oranje-Vis-tonnel. Department of Information, Pretoria 1975.Google Scholar
  3. Anonymous: Water 75, Erudita Publications, Johannesburg 1975.Google Scholar
  4. Anonymous (Undated): Hendrik Verwoerd Dam, ESCOM Official Publication.Google Scholar
  5. Anonymous (Undated): P.K. le Roux Dam, ESCOM Official Publication.Google Scholar
  6. Barnard, W.S., Smit, P. and van Zyl, J.A.: Suid-Afrika: Die land en sy streke. Nasou, Parow 1972.Google Scholar
  7. Bulletin of the African Institute of South Africa: Suid-Afrika se Waterbronne, 6/3 (1966).Google Scholar
  8. Bulletin of the Africa Institute of South Africa: Botswana en Lesotho, 6/10 (1966).Google Scholar
  9. Helgren, D.M.: River of Diamonds. University of Chicago. Research Paper No. 185, (1979).Google Scholar
  10. Jordaan, J.M.: Die voorkoms en verbruiksmoontlikhede van Suid-Afrika se Waterbronne, Tegnikon, 16, (1967).Google Scholar
  11. Kokot, D.F.: Oranjerivier, Tegnikon, 14, (1965).Google Scholar
  12. Kokot, D.F.: Is water the limiting factor in the Development of South Africa? Optima, 17, (1967).Google Scholar
  13. Kriel, J.P.: Sommige aspekte van die beplanning en ontwerp van die Oranjerivier-projek, Tegnikon, 14, (1965).Google Scholar
  14. Moolman, J.H.: The Orange River, South Africa. Geographical Review, 36 (1946).Google Scholar
  15. Republic of South Africa Official Yearbook: South Africa 1980/1.Google Scholar
  16. Republic of South Africa, Department of Transport, Weather Bureau: Climate of South Africa, Part 9, Average Monthly Rainfall, WB 29 (1965).Google Scholar
  17. Republic of South Africa, Department of Water Affairs: Report on the Proposed Orange River Development Project. WPX-'62 and supplementary reports WPAA-'64, WPLL-'68, WPN-'71, WPI-'73 and WPN-'74.Google Scholar
  18. Republic of South Africa, Department of Water Affairs: Monthly flow records of Gauging stations up to September 1960, I, Pretoria (1964).Google Scholar
  19. Republiek van Suid-Afrika: Verslag van die Kommissie van Ondersoek insake Wateraangeleenthede. R.P. 34/1970.Google Scholar
  20. Robertson, T.C.: Water. Nasionale Handelsdrukkery, Cape Town 1970.Google Scholar
  21. Stander, G.J.: Die optimum benutting van die Republiek se waterpotensiaal, Handhaaf 1967.Google Scholar
  22. Swanevelder, C.J., Kotze, J.C. et al.: Senior Geography for std. 10. Nasou, Parow 1980.Google Scholar
  23. Wellington, J.H.: The Middle Course of the Orange River. The South African Journal, 16 (1933).Google Scholar
  24. Wellington, J.H.: Southern Africa, I. Cambridge University Press 1955.Google Scholar
  25. Wellington, J.H.: The evolution of the Orange River Basin: Some outstanding problems. The South African Geographical Journal, 40. (1958).Google Scholar

Copyright information

© Akademische Verlagsgesellschaft 1981

Authors and Affiliations

  • Swanevelder C. J. 
    • 1
  1. 1.Department of GeographyUniversity of StellenboschStellenbosch, Cape ProvinceRepublic of South Africa

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