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The Orange River is a river in Southern Africa. It is the longest river in South Africa. The Orange River Basin extends extensively from Lesotho into South Africa and Namibia to the north. It rises in the Drakensberg mountains in Lesotho, flowing westwards through South Africa to the Atlantic Ocean. The river forms part of the international borders between South Africa and Lesotho and between South Africa and Namibia, as well as several provincial borders within South Africa. Except for Upington, it does not pass through any major cities. The Orange River plays an important role in the South African economy by providing water for irrigation and hydroelectric power. The river was named the Orange River in honour of the Dutch ruling family, the House of Orange, by the Dutch explorer Robert Jacob Gordon. Other names include simply the word for river, in Khoekhoegowab orthography written as !Garib, which is rendered in Afrikaans as Gariep River with the intrusion of a velar fricative in place of the alveolar click, Groote River or Senqu River, derived from ǂNū "Black".
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 conjunction with the Orange River southwest of Kimberley in the Northern Cape. It is 1,120 kilometres (700 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. 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.
Vanderbijlpark is an industrial city with approximately 75 000 inhabitants, and 95 000 inhabitants in the metropole, situated on the Vaal River in the south of Gauteng province, South Africa. The city is named after Hendrik van der Bijl, an electrical engineer and industrialist.
Hartswater is an agricultural town on the Phokwane River, a small tributary of the Harts River, some 23 km south of Taung and 36 km north of Warrenton. The centre of the Vaalharts Irrigation Scheme, it became a municipality in April 1960. It takes its name from the Harts River.
Warrenton is an agricultural town of approximately 18,000 people in the Northern Cape province of South Africa, situated 70 kilometres (40 mi) north of Kimberley on the Vaal River.
Windsorton is an agricultural town situated in the Vaalharts Irrigation Scheme on the banks of the Vaal River in the Northern Cape province of South Africa.
The Harts River is a northern tributary of the Vaal River, which in turn is the largest tributary of the Orange River. Its source is in the North West Province, but the greater part of its basin is located in the Northern Cape Province, which it enters a few kilometers downstream from the Taung Dam.
The Klamath Project is a water-management project developed by the United States Bureau of Reclamation to supply farmers with irrigation water and farmland in the Klamath Basin. The project also supplies water to the Tule Lake National Wildlife Refuge, and the Lower Klamath National Wildlife Refuge. The project was one of the first to be developed by the Reclamation Service, which later became the Bureau of Reclamation.
The Navajo Indian Irrigation Project (NIIP) is a large agricultural development located in the northwest corner of New Mexico. The NIIP is one of the largest Native American owned and operated agricultural businesses in the United States. This venture finds its origins in the 1930s when the federal government was looking for economic development for the Navajo Nation. The NIIP was approved in 1962 by Congress. The Bureau of Reclamation received the task of constructing this project.
Lift irrigation is a method of irrigation in which water is not transported by natural flow, but is lifted with pumps or surge pools etc.
Mexico, a classified arid and semi-arid country, has a total land area of 2 million square kilometres, 23% of which is equipped for irrigated agriculture. The agricultural sector plays an important role in the economic development of the country accounting for 8.4 of agricultural gross domestic product (GDP) and employing 23% of the economically active population. Irrigated agriculture contributes about 50% of the total value of agricultural production and accounts for about 70% of agriculture exports. Mexico's government initiated a number of structural reforms in the water sector aimed to introduce modern water management and irrigation.
Interbasin transfer or transbasin diversion are terms used to describe man-made conveyance schemes which move water from one river basin where it is available, to another basin where water is less available or could be utilized better for human development. The purpose of such designed schemes can be to alleviate water shortages in the receiving basin, to generate electricity, or both. Rarely, as in the case of the Glory River which diverted water from the Tigris to Euphrates River in modern Iraq, interbasin transfers have been undertaken for political purposes. While ancient water supply examples exist, the first modern developments were undertaken in the 19th century in Australia, India and the United States; large cities such as Denver and Los Angeles would not exist as we know them today without these diversion transfers. Since the 20th century many more similar projects have followed in other countries, including Israel, Canada and China. Utilized alternatively, the Green Revolution in India and hydropower development in Canada could not have been accomplished without such man-made transfers.
Vaalharts Storage Weir is a dam in South Africa. It was established in 1936. Vaalhartz Weir is located on the Vaal River approximately 100 km downstream of Bloemhof Dam and 13 km upstream of Warrenton. The main purpose of the dam is to divert water from the Vaal River to the Vaalhartz Government Water Scheme as well as the Barkly Government Water Scheme. Water is also used for numerous small towns including Vryburg, Hartswater, Jan Kempdorp, Warrenton, Winsorton, Kipdam, Barkly West and Delportshoop.
The Bakolori Dam is in Sokoto State in northwest Nigeria. It was completed in 1978 and its reservoir filled by 1981. It is a major reservoir on the Sokoto River, a tributary of the Rima River, which in turn feeds the Niger River. Water from the dam supplies the Bakolori Irrigation Project.
Haldia is a community development block that forms an administrative division in Haldia subdivision of Purba Medinipur district in the Indian state of West Bengal. In earlier days this block was referred to as Sutahata II block, and Sutahata block was referred to as Sutahata I block.
Egra I is a community development block that forms an administrative division in Egra subdivision of Purba Medinipur district in the Indian state of West Bengal.
The Office du Niger is a semi-autonomous government agency in Mali that administers a large irrigation scheme in the Ségou Region of the country. Water from the Niger River is diverted into a system of canals at the Markala dam 35 kilometres (22 mi) downstream of Ségou. The water is used to irrigate nearly 100,000 hectares (390 sq mi) of the flat alluvial plains to the north and northeast of Markala that form part of the Delta mort. Although the French colonial administration constructed the system to produce cotton for the textile industry, the main agricultural product is now rice. Around 320,000 tons are grown each year representing 40 percent of the total Malian production. Large quantities of sugar cane are also grown in joint ventures between a Chinese company and the Malian state. The irrigation scheme uses 2.7 km3 (0.65 cu mi) of water each year corresponding to around 10 percent of the total flow of the Niger River.
Exchange Irrigation Scheme is a 165 hectare irrigated arable land in Zhombe Communal Land but in Silobela Constituency in Kwekwe District of the Midlands Province of Zimbabwe. It is 37 km southwest of Zhombe Joel, 83 km northwest of Kwekwe and 25 km north of Crossroads DSC.
The Vaalharts Valley is located in the north-east corner of the Northern Cape province of South Africa, bordering the North West province. It gets its name because it is located between two rivers, the Vaal and the Harts. Because of its advantageous position between the two rivers, an irrigation scheme was built in the Vaalharts Valley in the 1930s.
References
- ↑ "Vaalharts - A Garden in the Desert" (PDF). Archived from the original (PDF) on 2014-02-23. Retrieved 2014-02-23.
- ↑ "Vaalharts Water Scheme History". Archived from the original on 2014-02-22. Retrieved 2014-02-22.
