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May Be'ati River
May Be’ati is a river of the Nile basin. Rising in the mountains of Degua Tembien, Dogu’a Tembien in northern Ethiopia, it flows southward to empty finally in Giba River, Giba and Tekezé River. Characteristics It is a confined ephemeral river 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 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 preceding baseflow. The magnitude of floods in this river has however been decreased due to interventions in the catchment. In May Be’ati the effect of such interventions has also been monitored. Physical and biological measures in the catchment At Gemgema, May Be'ati (exclos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
May Zegzeg
May Zegzeg is a river of the Nile basin. Rising in the mountains of Dogu’a Tembien in northern Ethiopia, it flows southward to empty finally in Giba and Tekezé River. Characteristics It is a confined river, locally meandering in its narrow alluvial plain, with an average slope gradient of 43 metres per kilometre. With its tributaries May Sho'ate and May Harena, the river has cut a gorge. Jointly with adjacent May Be’ati River, this river is the source of Rubaksa River. 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 preceding baseflow. The magnitude of floods in this river has however been decreased due to interventions in the catchment. At Habdi Luqmuts and on other steep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
May Be'ati (exclosure)
May Be’ati is an exclosure located in the Dogu'a Tembien ''woreda'' of the Tigray Region in Ethiopia. The area has been protected since 1968 by the local community. Timeline * 1968: established as exclosure by the community * 2017: support by the EthioTrees project Environmental characteristics * Area: 46 ha * Average slope gradient: 53% * Aspect: the exclosure is oriented towards the south * Minimum altitude: 2268 metres * Maximum altitude: 2428 metres * Lithology: Antalo Limestone, partly covered by non-calcareous sediments 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. Physical soil and water conservation has been implemented to enhance infiltration, and vegetation growth. There are four guards to protect the exclosure. Field observations showed that however some illegal grazing occurred in the exclosure in 2018. Benefits for the communi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertisol
A vertisol, or vertosol, is a soil type in which there is a high content of expansive clay minerals, many of them known as montmorillonite, that form deep cracks in drier seasons or years. In a phenomenon known as argillipedoturbation, alternate shrinking and swelling causes ''self-ploughing'', where the soil material consistently mixes itself, causing some vertisols to have an extremely deep A horizon and no B horizon. (A soil with no B horizon is called an ''A/C soil''). This heaving of the underlying material to the surface often creates a microrelief known as ''gilgai''. Vertisols typically form from highly basic rocks, such as basalt, in climates that are seasonally humid or subject to erratic droughts and floods, or that impeded drainage. Depending on the parent material and the climate, they can range from grey or red to the more familiar deep black (known as "black earths" in Australia, "black gumbo" in East Texas, "black cotton" soils in East Africa, and "vlei soils" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Groundwater Recharge
Groundwater recharge or deep drainage or deep percolation is a hydrologic process, where water moves downward from surface water to groundwater. Recharge is the primary method through which water enters an aquifer. This process usually occurs in the vadose zone below plant roots and is often expressed as a flux to the water table surface. Groundwater recharge also encompasses water moving away from the water table farther into the saturated zone. Recharge occurs both naturally (through the water cycle) and through anthropogenic processes (i.e., "artificial groundwater recharge"), where rainwater and or reclaimed water is routed to the subsurface. Processes Water is recharged naturally by rain and snow melt and to a smaller extent by surface water (rivers and lakes). Recharge may be impeded somewhat by human activities including paving, development, or logging. These activities can result in loss of topsoil resulting in reduced water infiltration, enhanced surface runoff and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peak Flow
The peak expiratory flow (PEF), also called peak expiratory flow rate (PEFR), is a person's maximum speed of expiration, as measured with a peak flow meter, a small, hand-held device used to monitor a person's ability to breathe out air. It measures the airflow through the bronchi and thus the degree of obstruction in the airways. Peak expiratory flow is typically measured in units of liters per minute (L/min). Function Peak flow readings are higher when patients are well, and lower when the airways are constricted. From changes in recorded values, patients and doctors may determine lung functionality, the severity of asthma symptoms, and treatment. Measurement of PEFR requires training to correctly use a meter and the normal expected value depends on the patient's sex, age, and height. It is classically reduced in obstructive lung disorders such as asthma. Due to the wide range of 'normal' values and the high degree of variability, peak flow is not the recommended test to identi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulic Roughness
Hydraulic roughness is the measure of the amount of frictional resistance water experiences when passing over land and channel features. One roughness coefficient is '' Manning's n-value''. Manning’s n is used extensively around the world to predict the degree of roughness in channels. Flow velocity is strongly dependent on the resistance to flow. An increase in this n value will cause a decrease in the velocity of water flowing across a surface. Manning's n The value of Manning’s n is affected by many variables. Factors like suspended load, sediment grain size, presence of bedrock or boulders in the stream channel, variations in channel width and depth, and overall sinuosity of the stream channel can all affect Manning’s n value. Biological factors have the greatest overall effect on Manning’s n; bank stabilization by vegetation, height of grass and brush across a floodplain, and stumps and logs creating natural dams are the main observable influences. Biological I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amba Aradam Sandstone
Amba or AMBA may refer to: Title * Amba Hor, alternative name for Abhor and Mehraela, Christian martyrs * Amba Sada, also known as Psote, Christian bishop and martyr in Upper Egypt Given name * Amba, the traditional first name given to the first daughter of the royal family in the Kingdom of Cochin, India * Amba (Mahabharata), the eldest daughter of King of Kashi in the Hindu epic * Amba Bongo, a writer and advocate for refugees from the Democratic Republic of the Congo * Amba Etta-Tawo (born 1993), American football player * Amba Prasad (1860–1950), Indian businessman and philanthropist * Sufi Amba Prasad (1858–1919), Indian nationalist and pan-Islamist leader * Amba, one of the names of the Hindu goddess Durga * Amba Shepherd, Australian singer and songwriter Languages * Amba language (Solomon Islands), one of the three Utupua languages * Amba language (Bantu), spoken by the Amba people of Uganda and the Democratic Republic of the Congo Places * Amba (river), in Primorsky ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Addi Qolqwal
Ayninbirkekin is a ''tabia'' or municipality in the Dogu'a Tembien district of the Tigray Region of Ethiopia. Literal meaning of Ayninbirkekin in Tigrinya is "We will not bend". The ''tabia'' centre is in Halah village, located approximately 8 km to the east of the ''woreda'' town Hagere Selam. Main town is Ala'isa, situated on the ridge overseeing the Giba valley. Geography The ''tabia'' is located astride a main water divide (that is followed by the main road) and stretches down towards May Zegzeg river at the south and upper Tsaliet River at the north. Three highest places (at around 2600 m a.s.l.) are Meri’a Ziban in the west, Imba Ra’isot in the centre and the escarpment to Arebay at the north. The lowest places are the confluence of May Zegzeg and May Be’ati Rivers (1970 m a.s.l.) in the south and in the north May Leiba River near Iyesus church (2240 m a.s.l.). Geology From the higher to the lower locations, the following geological form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrograph
A hydrograph is a graph showing the rate of flow ( discharge) versus time past a specific point in a river, channel, or conduit carrying flow. The rate of flow is typically expressed in cubic meters or cubic feet per second (cms or cfs). It can also refer to a graph showing the volume of water reaching a particular outfall, or location in a sewerage network. Graphs are commonly used in the design of sewerage, more specifically, the design of surface water sewerage systems and combined sewers. Terminology ;Discharge: the rate of flow (volume per unit time) passing a specific location in a river, or other channel. The discharge is measured at a specific point in a river and is typically time variant. ;Approach Segment: the river flow before the storm (antecedent flow). ;Rising limb: The rising limb of the hydrograph, also known as concentration curve, reflects a prolonged increase in discharge from a catchment area, typically in response to a rainfall event. ;Peak discharge:'the hig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discharge Meas In Upper May Baati
Discharge may refer to Expel or let go * Discharge, the act of firing a gun * Discharge, or termination of employment, the end of an employee's duration with an employer * Military discharge, the release of a member of the armed forces from service Flow * Discharge (hydrology), the amount of water flowing through the channel ** Effluent released into a river or sea ** Groundwater discharge, the volumetric flow rate of groundwater through an aquifer * Discharging method (discrete mathematics) is a proof technique in discrete mathematics * Electric discharge: ** Corona discharge, a type of electric current ** Direct-current discharge, a plasma ** Discharger, an electrical device that releases stored energy *** Battery discharging *** Static discharger, a device used on airplanes to maintain use of electrical equipment ** Electrostatic discharge, sudden and momentary electric current flows between two objects *** Dielectric barrier discharge, the electrical discharge between tw ... [...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] |
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