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Qarano River
Qarano is a river of the Nile The Nile, , Bohairic , lg, Kiira , Nobiin language, Nobiin: Áman Dawū is a major north-flowing river in northeastern Africa. It flows into the Mediterranean Sea. The Nile is the longest river in Africa and has historically been considered ... basin. Rising in the mountains of Degua Tembien , Dogu’a Tembien in northern Ethiopia, it flows eastward to empty in Giba River, Giba and Tekezé River. Characteristics It is a confined ephemeral river, locally meandering in its narrow alluvial plain, with an average slope gradient of 45 metres per kilometre. With its tributaries, the river has cut a deep gorge. Flash floods and flood buffering Runoff mostly occurs 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Addilal (exclosure)
Addilal is an exclosure located in the Dogu'a Tembien ''woreda'' of the Tigray Region in Ethiopia. The area has been protected since 1992 by the local community. Timeline * 1992: established as exclosure by the community * 2017: support by the EthioTrees project Environmental characteristics * Area: 145 ha * Average slope gradient: 21% * Aspect: the exclosure is oriented towards the south and the west * Minimum altitude: 2030 metres * Maximum altitude: 2212 metres * Lithology: Antalo Limestone Management As a general rule, cattle ranging and wood harvesting are not allowed. The grasses are harvested once yearly and taken to the homesteads of the village to feed livestock. There are two guards to protect the exclosure. Field observations showed that no illegal grazing occurred in the exclosure in 2018. Benefits for the community Setting aside such areas fits with the long-term vision of the communities were ''hiza’iti'' lands are set aside for use by the future generations. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rivers Of Ethiopia
This is a list of streams and rivers in Ethiopia, arranged geographically by drainage basin. There is an alphabetic list at the end of this article. Flowing into the Mediterranean *''Nile (Egypt, Sudan)'' Atbarah River *Mareb River (or Gash River) (only reaches the Atbarah in times of flood) **Obel River *Tekezé River (or Takkaze or Setit) ** Zarima River **Ataba River **Wari River *** Qortem Zer'a *** Tsaliet **** Agefet ***** Ab'aro ***** Azef River ***** Amblo **** Korowya **** Ferrey River **** Kidane Mihret River **** May Meqa **** Graliwdo ** Giba River *** Tanqwa **** Tsech'i River **** May Qoqah **** Arwadito **** Adawro River *** May Selelo *** Zikuli River *** Gra Adiam River, also called Bitchoqo River *** Zeyi River *** Inda Sillasie River **** May Zegzeg ***** May Harena ***** May Sho'ate **** May Be'ati River *** Addi Keshofo River *** May Gabat *** Inda Anbesa *** Ruba Bich'i River *** Hurura **** Afedena River ***** May Ayni **** Shimbula *** Ila ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Ethiopian Rivers
This is a list of streams and rivers in Ethiopia, arranged geographically by drainage basin. There is an alphabetic list at the end of this article. Flowing into the Mediterranean *''Nile (Egypt, Sudan)'' Atbarah River *Mareb River (or Gash River) (only reaches the Atbarah in times of flood) **Obel River *Tekezé River (or Takkaze or Setit) ** Zarima River **Ataba River **Wari River *** Qortem Zer'a *** Tsaliet **** Agefet ***** Ab'aro ***** Azef River ***** Amblo **** Korowya **** Ferrey River **** Kidane Mihret River **** May Meqa **** Graliwdo ** Giba River *** Tanqwa **** Tsech'i River **** May Qoqah **** Arwadito **** Adawro River *** May Selelo *** Zikuli River *** Gra Adiam River, also called Bitchoqo River *** Zeyi River *** Inda Sillasie River **** May Zegzeg ***** May Harena ***** May Sho'ate **** May Be'ati River *** Addi Keshofo River *** May Gabat *** Inda Anbesa *** Ruba Bich'i River *** Hurura **** Afedena River ***** May Ayni **** Shimbula *** Ila ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Addi Azmera
Addi Azmera is a ''tabia'' or municipality in the Dogu'a Tembien district of the Tigray Region of Ethiopia. The name refers to good spring rains (“azmera”), in relation to the local microclimate. The ''tabia'' centre is in Tukhul town, located approximately half-way between the ''woreda'' town Hagere Selam and the regional capital Mekelle. Geography The ''tabia'' stretches on both sides of the main road that climbs towards Dogu’a Tembien after passing the bridge on Giba River. The highest location are the upper slopes of Imba Dogu’a (2590 m a.s.l.) and the lowest place along Giba River (1750 m a.s.l.). It comprises cultivated plains and steeper slopes, with often good vegetation (re)growth. Geology From the higher to the lower locations, the following geological formations are present: * Mekelle Dolerite * Amba Aradam Formation * Agula Shale - there are gypsum quarries in this formation, exploited by the cement factory of Mekelle * Antalo Limestone – many quarri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tufa
Tufa is a variety of limestone formed when carbonate minerals precipitate out of water in unheated rivers or lakes. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits, which are known as travertine. Tufa is sometimes referred to as (meteogene) travertine. It should not be confused with hot spring (thermogene) travertine. Tufa, which is calcareous, should also not be confused with tuff, a porous volcanic rock with a similar etymology that is sometimes also called "tufa". Classification and features Modern and fossil tufa deposits abound with wetland plants; as such, many tufa deposits are characterised by their large macrobiological component, and are highly porous. Tufa forms either in fluvial channels or in lacustrine environments. Ford and Pedley (1996) provide a review of tufa systems worldwide. Fluvial deposits Deposits can be classified by their depositional environment (or otherwise by vegetation or petrographically). Pedle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antalo Limestone
The Antalo Limestone, also known as the Antalo Sequence, is a geological formation in Ethiopia. It is between 300 and 800 metres thick and comprises fossiliferous limestones and marls that were deposited in a reef. Marine microfossils have shown an age between 165 and 150 million years. Name and definition The Antalo Supersequence includes two main stratigraphic units: the Antalo Sequence and the Agula Group. The Antalo Sequence, or Antalo Limestone has been named after the town of Hintalo in Tigray, Ethiopia. The name of the formation was coined by geologist William Thomas Blanford, who accompanied the British Expedition to Abyssinia in 1868. At that time, Hintalo was a major town on the route of the invading British army. So far the nomenclature has not been proposed for recognition to the International Commission on Stratigraphy. Geographical extent The sedimentary succession is found in Ethiopia, in the Mekelle Outlier, in the Blue Nile gorge, in the Harrar Plateau and a ... [...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 Graliwdo ... [...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 Asia, east, South Asia, south, Western Asia, 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 Vineyard, vineyards, olive trees ... [...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 derived from ... [...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 and Precipitation can impact infiltration in many ways. ... [...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] |
