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Bokaa Dam
The Bokaa Dam is a dam on the Metsimotlhabe River, a tributary of the Ngotwane River, in Botswana. It provides water to the capital city of Gaborone. It is operated by the Water Utilities Corporation (Botswana), Water Utilities Corporation. Structure The Bokaa Dam was built in 1990/1991 by damming the Metsimotlhabe River, a tributary of the Ngotwane river just south of Bokaa village. The catchment area is about . The dam is an earthcore fill structure with a crest level height of . It was opened in 1993. The dam's surface area when full is . The reservoir is about in length and over at its widest. Water supply The Bokaa Dam has a capacity of . It is about from Botswana's capital of Gaborone. As of 2012 the dam provided 25% of the water supply for Gaborone and surrounding areas. There were exceptionally dry conditions in the winter of 2012, and the reservoir dried up and was closed in September 2012. The North-South Carrier (NSC) pipeline came into service in 2000, delivering ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Botswana
Botswana (, ), officially the Republic of Botswana ( tn, Lefatshe la Botswana, label=Setswana, ), is a landlocked country in Southern Africa. Botswana is topographically flat, with approximately 70 percent of its territory being the Kalahari Desert. It is bordered by South Africa to the south and southeast, Namibia to the west and north, and Zimbabwe to the northeast. It is connected to Zambia across the short Zambezi River border by the Kazungula Bridge. A country of slightly over 2.3 million people, Botswana is one of the most sparsely populated countries in the world. About 11.6 percent of the population lives in the capital and largest city, Gaborone. Formerly one of the world's poorest countries—with a GDP per capita of about US$70 per year in the late 1960s—it has since transformed itself into an upper-middle-income country, with one of the world's fastest-growing economies. Modern-day humans first inhabited the country over 200,000 years ago. The Tswana ethnic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acacia
''Acacia'', commonly known as the wattles or acacias, is a large genus of shrubs and trees in the subfamily Mimosoideae of the pea family Fabaceae. Initially, it comprised a group of plant species native to Africa and Australasia. The genus name is New Latin, borrowed from the Greek (), a term used by Dioscorides for a preparation extracted from the leaves and fruit pods of ''Vachellia nilotica'', the original type of the genus. In his ''Pinax'' (1623), Gaspard Bauhin mentioned the Greek from Dioscorides as the origin of the Latin name. In the early 2000s it had become evident that the genus as it stood was not monophyletic and that several divergent lineages needed to be placed in separate genera. It turned out that one lineage comprising over 900 species mainly native to Australia, New Guinea, and Indonesia was not closely related to the much smaller group of African lineage that contained ''A. nilotica''—the type species. This meant that the Australasian lineage (by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dams Completed In 1993
A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect or store water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC. The word ''dam'' can be traced back to Middle English, and before that, from Middle Dutch, as seen in the names of many old cities, such as Amsterdam and Rotterdam. History Ancient dams Early dam building took place in Mesopotamia and the Middle East. Dams were used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reservoirs And Dams In Botswana
A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including controlling a watercourse that drains an existing body of water, interrupting a watercourse to form an embayment within it, through excavation, or building any number of retaining walls or levees. In other contexts, "reservoirs" may refer to storage spaces for various fluids; they may hold liquids or gasses, including hydrocarbons. ''Tank reservoirs'' store these in ground-level, elevated, or buried tanks. Tank reservoirs for water are also called cisterns. Most underground reservoirs are used to store liquids, principally either water or petroleum. Types Dammed valleys Dammed reservoirs are artificial lakes created and controlled by a dam constructed across a valley, and rely on the natural topography to provide most of the basin of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pink-backed Pelican
The pink-backed pelican (''Pelecanus rufescens'') is a bird of the pelican family. It is a resident breeder in the swamps and shallow lakes of Africa and southern Arabia; it has also apparently extirpated in Madagascar. Taxonomy The pink-backed pelican was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's ''Systema Naturae''. He placed it with the other pelicans in the genus '' Pelecanus'' and coined the binomial name ''Pelecanus rufescens''. Gmelin based his description on the "red-backed pelican" that had been described in 1785 by the English ornithologist John Latham in his multi-volume work ''A General Synopsis of Birds ''. Latham had been sent a specimen from West Africa. The specific epithet ''rufescens'' is Latin for "reddish". The species is monotypic: no subspecies are recognised. Description It is a relatively small pelican, although by no means is it a small bird. Its length is fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Crested Grebe
The great crested grebe (''Podiceps cristatus'') is a member of the grebe family of water birds noted for its elaborate mating display. Taxonomy The great crested grebe was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his ''Systema Naturae'' under the binomial name ''Colymbus cristatus''. The great crested grebe is now the type species of the genus ''Podiceps'' that was erected by the English naturalist John Latham in 1787. The type locality is Sweden. The scientific name comes from Latin: the genus name ''Podiceps'' is from , "vent" and , "foot", and is a reference to the placement of a grebe's legs towards the rear of its body; the species name, ''cristatus'', means "crested". Three subspecies are recognised: * ''P. c. cristatus'' (Linnaeus, 1758) – Eurasia * ''P. c. infuscatus'' Salvadori, 1884 – Africa * ''P. c. australis'' Gould, 1844 – Australia, Tasmania, South Island of New Zealand Description The great creste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Pochard
The southern pochard (''Netta erythrophthalma'') is a species of duck, and a member of the genus ''Netta''. There are two subspecies, the South American (southern) pochard ''N. e. erythrophthalma'' (Wied-Neuwied, 1833) and the African (southern) pochard ''N. e. brunnea'' ( Eyton, 1838). The South American pochard has a fragmented range and is found from Colombia, Venezuela, Brazil, Ecuador, Peru, Bolivia and Argentina to Chile. Here it occurs in a wide variety of shallow fresh waters with submerged vegetation, from the lowlands up to 3,700 metres. The African pochard occurs from the Cape to the Ethiopian highlands on water bodies with or without emergent vegetation. They are suspected to have been strong migrants in the past but the construction of numerous farm dams seems to allow them a more sedentary lifestyle. They reach highest concentrations in Africa's central plateaus and in the south-western winter rainfall region. Taxonomy Two syntype specimens of ''Nyroca brunnea'' Ey ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Savanna
A savanna or savannah is a mixed woodland-grassland (i.e. grassy woodland) ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground to support an unbroken herbaceous layer consisting primarily of grasses. According to '' Britannica'', there exists four savanna forms; ''savanna woodland'' where trees and shrubs form a light canopy, ''tree savanna'' with scattered trees and shrubs, ''shrub savanna'' with distributed shrubs, and ''grass savanna'' where trees and shrubs are mostly nonexistent.Smith, Jeremy M.B.. "savanna". Encyclopedia Britannica, 5 Sep. 2016, https://www.britannica.com/science/savanna/Environment. Accessed 17 September 2022. Savannas maintain an open canopy despite a high tree density. It is often believed that savannas feature widely spaced, scattered trees. However, in many savannas, tree densities are higher and trees are more regularly spaced than in for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mmamashia
Mmamashia is a location in Botswana about north of the capital city of Gaborone that is the site of the Mmamashia water treatment plant and master balancing reservoir. Waterworks The reservoir and plant are operated and maintained by the Water Utilities Corporation. The original source of supply was the Bokaa Dam, directly to the north. Implementation of the North-South Carrier water project in 2000 brought raw water to the plant from the Letsibogo Dam on the Motloutse River, much further north. After treatment the water is distributed to consumers in the Gaborone area. The reservoir is built of reinforced concrete, and has a capacity of . The reservoir is closed to minimize loss through evaporation. As of 2003 the plant had capacity of per day. That year there was a shortage of water from the Letsibogo Dam, planned to be the primary supply. Instead, the plant was using water from the Gaborone Dam and water imported from South Africa. Phase 2 of the North-South Carrier Wat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kgatleng District
Kgatleng is one of the districts of Botswana, coterminous with the homeland of the Bakgatla people. Its capital is Mochudi, the hometown of protagonist Precious Ramotswe in Alexander McCall Smith's popular ''The No. 1 Ladies' Detective Agency'' series. According to the 2001 Census, Kgatleng had a population of 73,507 people. Kgatleng borders the North West Province of South Africa in the south, and to the east it borders South Africa's Limpopo Province. Domestically, it borders South-East District in southwest, Kweneng District in the west, Central District in the north. The tourist and game reserves in the region are Oodi Weavers and Matsieng footprints. As of 2011, the total population of the district was 91,660 compared to 73,507 in 2001. The growth rate of population during the decade was 2.23. The total number of workers constituted 25,130 with 13,278 males and 11,853 females, with a majority involved in agriculture. The district is administered by a district administra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North-South Carrier
The North-South Carrier (NSC) is a pipeline in Botswana that carries raw water south for a distance of to the capital city of Gaborone. Phase 1 was completed in 2000. Phase 2 of the NSC, under construction, will duplicate the pipeline to carry water from the Dikgatlhong Dam, which was completed in 2012. A proposed extension to deliver water from the Zambezi would add another to the total pipeline length. The NSC is the largest engineering project ever undertaken in Botswana. Climate Botswana has an arid climate, with little in the way of surface water supplies. Until recently, groundwater wells were used to meet about 80% of demand for water. Some of the groundwater accumulated long ago when the climate was wetter. "Groundwater mining" is not sustainable in areas where the water is not being renewed from the surface. The more populous eastern portion of Botswana lies in the Limpopo River basin, which is considered "closed". In the South African portion of the basin, water usa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bokaa
Bokaa is a village in Kgatleng District of Botswana. The village is located around 20 km south-west of Mochudi Mochudi is one of the larger villages in Botswana with a population of 44,815 people in 2011. It is situated in the Bakgatla tribal region, in Kgatleng District, about northeast of Gaborone. The village lies several kilometres from the main G ... and the population was 5,765 in 2011 census. The village is just north of the Bokaa Dam. References Kgatleng District Villages in Botswana {{botswana-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
