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Tsaliet River Near Addeha
Tsaliet is a river in northern Ethiopia, belonging to the Nile basin. Rising in the mountains of Dogu’a Tembien, where it is first called May Leiba River and then Tinsehe River, it flows westward through a deep gorge, to become Tsaliet in its lower course, where it empties in Weri’i River, just upstream of the main Weri’i bridge along the road to Adwa. Characteristics It is mostly a confined river, locally meandering in its narrow alluvial plain, with an average slope gradient of 25 metres per kilometre. With its tributaries, the river has cut deep gorges. Along the middle of its course, it occupies sandy pediments in Addeha. Flash floods and flood buffering Runoff mostly happens in the form of high runoff discharge events that occur in a very short period (called flash floods). These are related to the steep topography, often little vegetation cover and intense convective rainfall. The peaks of such flash floods have often a 50 to 100 times larger discharge than the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dabba Selama
Dabba may refer to: * Dabba or tiffin carrier, a lunch box used in South Asia * ''The Lunchbox'', working title ''Dabba'', a 2013 Indian film * Dabba (company), a South African telco company * ∂, a mathematical symbol * Beast of the Earth, or ''Dabbat al-Ardḍ'', an apocalyptic creature in Islam See also * Dhaba, the name for a roadside restaurant in South Asia * Daba (other) * Dabbas (other) Dabbas may refer to: * Athanasius II Dabbas (died 1619), Melkite Greek Patriarch of Antioch * Athanasius III Dabbas (1647–1724), Melkite Greek Patriarch of Antioch * Cyril IV Dabbas, Patriarch claimant who contended with Ignatius III Atiyah * ... * Yabba Dabba Doo (other) {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hawzien
Hawzen ( Ge'ez: ሓውዜን) is a town in northern Ethiopia. Located in the Misraqawi (Eastern) Zone of the Tigray Region (or ''kilil''), this town has a latitude and longitude of with an elevation of 2105 meters above sea level. Its market day is Wednesday. It is the largest settlement in Hawzen woreda. History Origins Tradition states that Hawzen was founded by the Sadqan, a group of Christian missionaries who traveled to the Aksumite Kingdom during the reign of Kaleb of Aksum. Four ancient stelae, similar to the Gudit Stelae outside Axum, can be found in the marketplace. The Church of Hawzen Tekle Haymanot, although a modern structure, encloses "a small rock-hewn church thought to be one of the oldest in Tigray based on the finely carved capital and column". 19th Century On 8 March 1892, ''Dejazmach'' Sebhat Aregawi submitted to Ras Mangesha Yohannes at Hawzen by ceremonially carrying a stone upon his neck before Ras Mangesha as the other Rases of Tigray and Ic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Infiltration (hydrology)
Infiltration is the process by which water on the ground surface enters the soil. It is commonly used in both hydrology and soil sciences. The infiltration capacity is defined as the maximum rate of infiltration. It is most often measured in meters per day but can also be measured in other units of distance over time if necessary. The infiltration capacity decreases as the soil moisture content of soils surface layers increases. If the precipitation rate exceeds the infiltration rate, runoff will usually occur unless there is some physical barrier. Infiltrometers, permeameters and rainfall simulators are all devices that can be used to measure infiltration rates. Infiltration is caused by multiple factors including; gravity, capillary forces, adsorption and osmosis. Many soil characteristics can also play a role in determining the rate at which infiltration occurs. Factors that affect infiltration Precipitation Precipitation can impact infiltration in many ways. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exclosure
An exclosure, in an area being used extensively for grazing, is a limited area from which unwanted browsing animals, such as domestic cattle or wildlife such as deer, are excluded by fencing or other means. Environmental protection Most commonly, exclosures are areas that are set aside for regreening. Wood harvesting and livestock range are not allowed there. Effects on environment The establishment of an exclosure has positive effects on: * biodiversity * water infiltration * protection from flooding * sediment deposition * carbon sequestration Economic benefits In developing countries, people commonly have economic benefits from these exclosures through grass harvesting, beekeeping and other non-timber forest products. The local inhabitants also consider it as “land set aside for future generations”. Carbon credits Exclosures have as an additional benefit that the surrounding communities may receive carbon credits for the sequestered CO2, as part of a carbon offs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Check Dam
A steel check dam A check dam is a small, sometimes temporary, dam constructed across a swale, drainage ditch, or waterway to counteract erosion by reducing water flow velocity. Check dams themselves are not a type of new technology; rather, they are an ancient technique dating from the second century A.D. Check dams are typically, though not always, implemented in a system of several dams situated at regular intervals across the area of interest. Function A check dam placed in the ditch, swale, or channel interrupts the flow of water and flattens the gradient of the channel, thereby reducing the velocity. In turn, this obstruction induces infiltration and reduces eroding. They can be used not only to slow flow velocity but also to distribute flows across a swale to avoid preferential paths and guide flows toward vegetation. Although some sedimentation may result behind the dam, check dams do not primarily function as sediment-trapping devices. For instance, on the Grali ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terrace (earthworks)
In agriculture, a terrace is a piece of sloped plane that has been cut into a series of successively receding flat surfaces or platforms, which resemble steps, for the purposes of more effective farming. This type of landscaping is therefore called terracing. Graduated terrace steps are commonly used to farm on hilly or mountainous terrain. Terraced fields decrease both erosion and surface runoff, and may be used to support growing crops that require irrigation, such as rice. The Rice Terraces of the Philippine Cordilleras have been designated as a UNESCO World Heritage Site because of the significance of this technique. Uses Terraced paddy fields are used widely in rice, wheat and barley farming in east, south, southwest, and southeast Asia, as well as the Mediterranean Basin, Africa, and South America. Drier-climate terrace farming is common throughout the Mediterranean Basin, where they are used for vineyards, olive trees, cork oak, and other crops. Ancient history Te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baseflow
Baseflow (also called drought flow, groundwater recession flow, low flow, low-water flow, low-water discharge and sustained or fair-weather runoff) is the portion of the streamflow that is sustained between precipitation events, fed to streams by delayed pathways. It should not be confused with groundwater flow. Fair weather flow is also called base flow. Importance Baseflow is important for sustaining human centers of population and ecosystems. This is especially true for watersheds that do not rely on snowmelt. Different ecological processes will occur at different parts of the hydrograph. During the baseflow ascending limb, there is frequently more stream area and habitat available for water-dependent species, spawning salmon for example. During the recession limb which in California is from May to October, there is increasingly less stream area, indigenous species are more adept at surviving in low flow conditions than introduced species. Geology Baseflow is deriv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flash Floods
A flash flood is a rapid flooding of low-lying areas: washes, rivers, dry lakes and depressions. It may be caused by heavy rain associated with a severe thunderstorm, hurricane, or tropical storm, or by meltwater from ice or snow flowing over ice sheets or snowfields. Flash floods may also occur after the collapse of a natural ice or debris dam, or a human structure such as a man-made dam, as occurred before the Johnstown Flood of 1889. Flash floods are distinguished from regular floods by having a timescale of fewer than six hours between rainfall and the onset of flooding. Flash floods are a significant hazard, causing more fatalities in the U.S. in an average year than lightning, tornadoes, or hurricanes. Flash floods can also deposit large quantities of sediments on floodplains and can be destructive of vegetation cover not adapted to frequent flood conditions. Causes Flash floods most often occur in dry areas that have recently received precipitation, but they ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meander
A meander is one of a series of regular sinuous curves in the channel of a river or other watercourse. It is produced as a watercourse erodes the sediments of an outer, concave bank ( cut bank) and deposits sediments on an inner, convex bank which is typically a point bar. The result of this coupled erosion and sedimentation is the formation of a sinuous course as the channel migrates back and forth across the axis of a floodplain. The zone within which a meandering stream periodically shifts its channel is known as a meander belt. It typically ranges from 15 to 18 times the width of the channel. Over time, meanders migrate downstream, sometimes in such a short time as to create civil engineering challenges for local municipalities attempting to maintain stable roads and bridges.Neuendorf, K.K.E., J.P. Mehl Jr., and J.A. Jackson, J.A., eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. Charlton, R., 2007. ''Fundamen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tinsehe Waterfall 2
Selam is a ''tabia'' or municipality in the Dogu'a Tembien district of the Tigray Region of Ethiopia. The ''tabia'' centre is in Addi Werho village, located approximately 3 km to the northeast of the ''woreda'' town Hagere Selam. Geography The ''tabia'' stretches down north of the ridge occupied by the main road towards the Tinsehe gorge. The highest peak is Imba Khoboro (2730 m a.s.l.) and the lowest place at the foot of the waterfall in Tinsehe (2000 m a.s.l.). Geology From the higher to the lower locations, the following geological formations are present: * Phonolite plugs * Upper basalt * Interbedded lacustrine deposits * Lower basalt * Amba Aradam Formation * Antalo Limestone * Quaternary alluvium and freshwater tufa Geomorphology and soils The main geomorphic units, with corresponding soil types are: Hagere Selam Highlands, along the upper basalt and sandstone ridge * Associated soil types ** shallow soils with high stone contents (Ske ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DT Drainage
DT may refer to: Arts Music * Dt. (band), a Japanese dance/rock group * "D.T.", an instrumental song on '' Who Made Who'', AC/DC's 1986 album * Dark Tranquillity, Swedish melodic death metal band * Dream Theater, American progressive metal band * MC DT, a UK garage emcee rap artist and member of DJ Pied Piper and the Masters of Ceremonies Other media * The Dark Tower (other), various works of fiction * Dilithium (''Star Trek''), fictional chemical element by its symbol * '' Ixion Saga DT'', a television series Businesses and organisations * Dalarnas Tidningar, Swedish newspaper and media company * Deutsche Telekom (by NYSE ticker symbol) * Dhanmondi Tutorial, an educational organisation * Dimosia Tileorasi, a former Greek public broadcaster * Dynatrace, software intelligence provider (by NYSE stock symbol) * TAAG Angola Airlines (IATA code: DT) * Turkish State Theatres ( tr, Devlet Tiyattolari, link=no) Language and linguistics * d/t, shorthand for "due to" * Dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adwa
Adwa ( ti, ዓድዋ; amh, ዐድዋ; also spelled Aduwa) is a town and separate woreda in Tigray Region, Ethiopia. It is best known as the community closest to the site of the 1896 Battle of Adwa, in which Ethiopian soldiers defeated Italian troops, thus being one of the few African nations to thwart European colonialism. Located in the Central Zone of the Tigray Region, Adwa has a longitude and latitude of , and an elevation of 1907 meters. Adwa is surrounded by Adwa woreda. Adwa is home to several notable churches: Adwa Gebri'el Bet (built by Dejazmach Wolde Gebriel), Adwa Maryam Bet (built by Ras Anda Haymanot), Adwa Medhane `Alem Bete (built by Ras Sabagadis), Adwa Queen of Sheba secondary school, and Adwa Selasse Bet. Near Adwa is Abba Garima Monastery, founded in the sixth century by one of the Nine Saints and known for its tenth century gospels. Also nearby is the village of Fremona, which had been the base of the 16th century Jesuits sent to convert Ethiopi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
