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Dibdibo
Dibdibo is a reservoir named after the homonymous village, located in the Inticho ''woreda'' of the Tigray Region in Ethiopia. The earthen dam that holds the reservoir was built in 1999 by the Relief Society of Tigray. Dam characteristics * Dam height: 17.8 metres * Dam crest length: 433 metres * Spillway width: 15 metres Capacity * Original capacity: 1 022 900 m³ * Dead storage: 153 435 m³ * Reservoir area: 17.24 ha In 2002, the life expectancy of the reservoir (the duration before it is filled with sediment) was estimated at 22 years. Irrigation * Designed irrigated area: 100 ha * Actual irrigated area in 2002: 70 ha Environment The catchment of the reservoir is 7 km² large. The reservoir suffers from rapid siltation. The lithology of the catchment is Adigrat Sandstone, Enticho Sandstone, tertiary basalt and Precambrian metavolcanics. Part of the water that could be used for irrigation is lost through seepage; the positive side-effect is that this contributes to gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Relief Society Of Tigray
The Relief Society of Tigray (abbreviated REST; ti, ማሕበራዊ ረዲኤት ትግራይ or ማረት, ''Maret'') is an NGO based in Tigray, northern Ethiopia. REST was founded in 1978 as an organisation providing relief efforts to civilians. As of 2008, Teklewoini Assefa served as Executive Director of REST.Royal Norwegian Embassy in Addis Ababa. Relief Society of Tigray celebrates 30th Anniversary' REST emerged as the humanitarian wing of the Tigray People's Liberation Front (TPLF) and has remained closely linked to TPLF. REST was active throughout the armed conflict of the 1980s, including during the devastating 1984–1985 famine. Since the 1990s it is the major NGO operating in Tigray. Emergence and civil war of the 1980s Prior to the TPLF and Ethiopian People's Revolutionary Democratic Front (EPRDF) overthrowing the Derg government in 1991, REST worked in the areas under the control of the TPLF, operating over 60 schools and 53 clinics. The organization had a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tigray Region
The Tigray Region, officially the Tigray National Regional State, is the northernmost regional state in Ethiopia. The Tigray Region is the homeland of the Tigrayan, Irob, and Kunama people. Its capital and largest city is Mekelle. Tigray is the fifth-largest by area, the fifth-most populous, and the fifth-most densely populated of the 11 regional states. Tigray's official language is Tigrinya, similar to that spoken in Eritrea just to the North. The estimated population as of 2019 is 5,443,000. The majority of the population (c. 80%) are farmers, contributing 46% to the regional gross domestic product (2009). The highlands have the highest population density, especially in eastern and central Tigray. The much less densely populated lowlands comprise 48% of Tigray's area. Like many parts of Africa, Tigray is far from a religious monolith. Despite the historical identification of Ethiopia with Orthodox Christianity, the presence of Islam in Ethiopia is as old as the relig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ethiopia
Ethiopia, , om, Itiyoophiyaa, so, Itoobiya, ti, ኢትዮጵያ, Ítiyop'iya, aa, Itiyoppiya officially the Federal Democratic Republic of Ethiopia, is a landlocked country in the Horn of Africa. It shares borders with Eritrea to the north, Djibouti to the northeast, Somalia to the east and northeast, Kenya to the south, South Sudan to the west, and Sudan to the northwest. Ethiopia has a total area of . As of 2022, it is home to around 113.5 million inhabitants, making it the 13th-most populous country in the world and the 2nd-most populous in Africa after Nigeria. The national capital and largest city, Addis Ababa, lies several kilometres west of the East African Rift that splits the country into the African and Somali tectonic plates. Anatomically modern humans emerged from modern-day Ethiopia and set out to the Near East and elsewhere in the Middle Paleolithic period. Southwestern Ethiopia has been proposed as a possible homeland of the Afroasiatic la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inticho
Enticho is a town in northern Ethiopia located in the Central Zone of the Tigray Region. It is the administrative center of Enticho woreda. History 19th Century Enticho is the location where on 1 July 1889 that Fitawrari Dabbab Araya (later ''Dejazmach'') met ''Dejazmach'' Embaye. Dabbab was taken prisoner by Ras Alula Engida's followers two weeks later. 20th Century After the Italian conquest, a telegraph office was opened in the town on 22 April 1936, and a post office on 1 July. Records at the Nordic Africa Institute website provide details of a primary school in the town in 1968. More recently, Enticho was the site where the Ethiopian People's Revolutionary Democratic Front defeated armed units of the Ethiopian People's Revolutionary Party (EPRP) on 23 March 1978, and pursued them back to the EPRP's stronghold on Mount Asimba. Demographics Based on figures from the Central Statistical Agency The Central Statistical Agency (CSA; Amharic: ማዕከላዊ ስ ... [...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] |
Earthen Dam
An embankment dam is a large artificial dam. It is typically created by the placement and compaction of a complex semi-plastic mound of various compositions of soil or rock. It has a semi-pervious waterproof natural covering for its surface and a dense, impervious core. This makes the dam impervious to surface or seepage erosion. Such a dam is composed of fragmented independent material particles. The friction and interaction of particles binds the particles together into a stable mass rather than by the use of a cementing substance. Types Embankment dams come in two types: the earth-filled dam (also called an earthen dam or terrain dam) made of compacted earth, and the rock-filled dam. A cross-section of an embankment dam shows a shape like a bank, or hill. Most have a central section or core composed of an impermeable material to stop water from seeping through the dam. The core can be of clay, concrete, or asphalt concrete. This type of dam is a good choice for sites wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spillway
A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure that water does not damage parts of the structure not designed to convey water. Spillways can include floodgates and fuse plugs to regulate water flow and reservoir level. Such features enable a spillway to regulate downstream flow—by releasing water in a controlled manner before the reservoir is full, operators can prevent an unacceptably large release later. Other uses of the term "spillway" include bypasses of dams and outlets of channels used during high water, and outlet channels carved through natural dams such as moraines. Water normally flows over a spillway only during flood periods, when the reservoir has reached its capacity and water continues entering faster than it can be released. In contrast, an intake tower is a stru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dead Storage
Death is the irreversible cessation of all biological functions that sustain an organism. For organisms with a brain, death can also be defined as the irreversible cessation of functioning of the whole brain, including brainstem, and brain death is sometimes used as a legal definition of death. The remains of a former organism normally begin to decompose shortly after death. Death is an inevitable process that eventually occurs in almost all organisms. Death is generally applied to whole organisms; the similar process seen in individual components of an organism, such as cells or tissues, is necrosis. Something that is not considered an organism, such as a virus, can be physically destroyed but is not said to die. As of the early 21st century, over 150,000 humans die each day, with ageing being by far the most common cause of death. Many cultures and religions have the idea of an afterlife, and also may hold the idea of judgement of good and bad deeds in one's life (heaven, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catchment
A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, the '' drainage divide'', made up of a succession of elevated features, such as ridges and hills. A basin may consist of smaller basins that merge at river confluences, forming a hierarchical pattern. Other terms for a drainage basin are catchment area, catchment basin, drainage area, river basin, water basin, and impluvium. In North America, they are commonly called a watershed, though in other English-speaking places, "watershed" is used only in its original sense, that of a drainage divide. In a closed drainage basin, or endorheic basin, the water converges to a single point inside the basin, known as a sink, which may be a permanent lake, a dry lake, or a point where surface water is lost underground. Drainage basins are similar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siltation
Siltation, is water pollution caused by particulate Terrestrial ecoregion, terrestrial Clastic rock, clastic material, with a particle size dominated by silt or clay. It refers both to the increased concentration of suspended sediments and to the increased accumulation (temporary or permanent) of fine sediments on bottoms where they are undesirable. Siltation is most often caused by soil erosion or sediment spill. It is sometimes referred to by the ambiguous term "sediment pollution", which can also refer to a chemical contamination of sediments accumulated on the bottom, or to pollutants bound to sediment particles. Although "siltation" is not perfectly stringent, since it also includes particle sizes other than silt, it is preferred for its lack of ambiguity. Causes The origin of the increased sediment transport into an area may be erosion on land or activities in the water. In rural areas, the erosion source is typically soil degradation by intensive or inadequate agricult ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adigrat Sandstone
The Adigrat Sandstone formation in north Ethiopia, in a wide array of reddish colours, comprises sandstones with coarse to fine grains, and locally conglomerates, silt- and claystones. Given the many lateritic palaeosols and locally fossil wood fragments, the formation is interpreted as a deposit in estuarine, lacustrine-deltaic or continental environments. The upper limit of Adigrat Sandstone is of Middle-Late Jurassic age (around 160 million years or Ma ago) whereas the lower boundary is Triassic (200 Ma). There are numerous rock-hewn churches in this formation. Name and definition The name “Adigrat Sandstone” was coined by geologist William Thomas Blanford, who accompanied the British Expedition to Abyssinia in 1868. The formation is named after the town of Adigrat, on the route of the invading British army. So far the nomenclature was not proposed for recognition to the International Commission on Stratigraphy. Stratigraphic context The Adigrat Sandstone has been deposit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enticho Sandstone
The Enticho Sandstone is a geological formation in north Ethiopia. It forms the lowermost sedimentary rock formation in the region and lies directly on the basement rocks. Enticho Sandstone consists of arenite that is rich in quartz. The formation has a maximum thickness of 200 metres. Locally, its upper part is coeval with the Edaga Arbi Glacials. The Enticho Sandstone has been deposited during the Ordovician (485–443 million years), as evidenced by impressions of organisms. Description Name and definition The name was coined by geologists D.B. Dow and colleagues. So far the nomenclature has not been proposed for recognition to the International Commission on Stratigraphy. Geographical extent Enticho Sandstone outcrops in central-southern Eritrea and in northeast Tigray Region, Tigray in Ethiopia. Stratigraphic context Northern Ethiopia has experienced glaciations during the Palaeozoic, Early Palaeozoic (Late Ordovician; circa 445 million years ago), as well as in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
