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Koka Dam
The Koka Reservoir ( om, Haroo Qooqaa) is a reservoir in south-central Ethiopia. It was created by the construction of the Koka Dam across the Awash River. The reservoir has an area of 180 square kilometers. Geography Located in the East(Baha) Shewa Zone of the Oromia Region, close to the capital and largest city of Ethiopia, Addis Ababa, the Koka Reservoir is popular with tourists and city-dwellers. There is a variety of wildlife and birds around the lake. The reservoir supports a fishing industry; according to the Ethiopian Department of Fisheries and Aquaculture, 625 tonnes of fish are landed each year, which the department estimates is either 52% or 89% of its sustainable amount. Both the reservoir and the dam are threatened by increasing sedimentation caused by environmental degradation as well as the invasive water hyacinth ''Pontederia crassipes'' (formerly ''Eichhornia crassipes''), commonly known as common water hyacinth is an aquatic plant native to South America, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reservoir
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Environmental Degradation
Environmental degradation is the deterioration of the environment through depletion of resources such as quality of air, water and soil; the destruction of ecosystems; habitat destruction; the extinction of wildlife; and pollution. It is defined as any change or disturbance to the environment perceived to be deleterious or undesirable. Environmental concerns can be defined as the negative effects of any human activity on the environment. The biological as well as the physical features of the environment are included. Some of the primary environmental challenges that are causing great worry are air pollution, water pollution, natural environment pollution, rubbish pollution, and so o Environmental degradation is one of the ten threats officially cautioned by the High-level Panel on Threats, Challenges and Change, high-level PaneI on Threats, Challenges and Change of the United Nations. The United Nations International Strategy for Disaster Reduction defines environmental degra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dams In Ethiopia
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 us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reservoirs In Ethiopia
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] |
Ethiopian Birr
The birr ( am, ብር) is the unit of currency in Ethiopia. It is subdivided into 100 ''santim''. In 1931, Emperor Haile Selassie I formally requested that the international community use the name ''Ethiopia'' (as it had already been known internally for at least 1,600 years) instead of the exonym ''Abyssinia'', and the issuing ''Bank of Abyssinia'' also became the ''Bank of Ethiopia''. Thus, the pre-1931 currency could be considered the ''Abyssinian birr'' and the post-1931 currency the ''Ethiopian birr'', although it was the same country and the same currency before and after. 186 billion birr were in circulation in 2008 ($14.7 billion or €9.97 billion). History First birr, 1800–1936 In the 18th and 19th centuries, Maria Theresa thalers and blocks of salt called "amole tchew" (አሞሌ) served as currency in Ethiopia. The ''thaler'' was known locally as the ''Birr'' (literally meaning "silver" in Ge'ez and Amharic) or ''talari'' (ታላሪ). The Maria Theresa ''thale ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Società Anonima Elettrificazione
''Società'' (Italian: ''Society'') was an Italian communist cultural magazine published in Italy between 1945 and 1961. History and profile ''Società'' was founded as a quarterly magazine in Florence in 1945. The founders were Ranuccio Bianchi Bandinelli, Cesare Luporini and Romano Bilenchi. Bandinelli also directed the magazine. In 1948 the magazine became closer to the Italian Communist Party (PCI), but was not published by the party. The headquarters was later moved to Rome, and in 1954 its frequency was switched to bimonthly. ''Società'' featured Italian fiction and poetry and occasionally included some essays on the theater and the cinema. It was one of the publications read by the Italian intellectuals, who had Gramscian Antonio Francesco Gramsci ( , , ; 22 January 1891 – 27 April 1937) was an Italian Marxist philosopher, journalist, linguist, writer, and politician. He wrote on philosophy, political theory, sociology, history, and linguistics. He was a ... ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gruppo Industriale Elettro Meccaniche Per Impiante All'Estero
Gruppo may refer to: * groupset A groupset or gruppo (from the Italian for "group", sometimes misspelled grouppo) is a bicycle component manufacturer's organized collection of mechanical parts. It generally refers to all of the components that make up a bicycle excluding the bic ..., a bicycle component manufacturer's organized collection of mechanical parts * Leonard Gruppo (born 1942), a politician in Pennsylvania See also *' {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Hyacinth
''Pontederia crassipes'' (formerly ''Eichhornia crassipes''), commonly known as common water hyacinth is an aquatic plant native to South America, naturalized throughout the world, and often invasive outside its native range.''Pontederia crassipes'' Kew Royal Botanic Gardens Plants of the World Online. Accessed April 19, 2022.''Eichhornia crassipes'' Kew Royal Botanic Gardens Plants of the World Online. Accessed April 19, 2022. June 15, 2016. Flora of Banglade ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sedimentation
Sedimentation is the deposition of sediments. It takes place when particles in suspension settle out of the fluid in which they are entrained and come to rest against a barrier. This is due to their motion through the fluid in response to the forces acting on them: these forces can be due to gravity, centrifugal acceleration, or electromagnetism. Settling is the falling of suspended particles through the liquid, whereas sedimentation is the final result of the settling process. In geology, sedimentation is the deposition of sediments which results in the formation of sedimentary rock. The term is broadly applied to the entire range of processes that result in the formation of sedimentary rock, from initial erosion through sediment transport and settling to the lithification of the sediments. However, the strict geological definition of sedimentation is the mechanical deposition of sediment particles from an initial suspension in air or water. Sedimentation may pertain to obje ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reservoir
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tonne
The tonne ( or ; symbol: t) is a unit of mass equal to 1000 kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton to distinguish it from the non-metric units of the short ton ( United States customary units), and the long ton ( British imperial units). It is equivalent to approximately 2204.6 pounds, 1.102 short tons, and 0.984 long tons. The official SI unit is the megagram (symbol: Mg), a less common way to express the same mass. Symbol and abbreviations The BIPM symbol for the tonne is t, adopted at the same time as the unit in 1879.Table 6 . BIPM. Retrieved on 2011-07-10. Its use is also official for the metric ton in the United States, having been adopted by the United States |
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