About 90% of the sediment for the Nile originates in the Ethiopian highlands and travels the course of the Blue Nile during floods. Local topology is the main determining factor for rivers. Ethiopia is in the midst of a rainy season which started in July and is expected to last until mid-September, which occasionally causes landslides and floods in some parts of the East African country. The flooding of 6 August, 2006 was unprecedented and caused severe impacts in the city. This study was conducted in the Dire Dawa city watershed with the aims of assessing flood causing factors and to propose landscape based flood mitigation strategies. (2008, November 18). When a river becomes swollen because of larger or longer flow than normal, water will exceed the banks and overwhelm methods of flood preparation causing floods. While the rains caused destructive flooding, they … Some floods occur abruptly and recede quickly whereas others take several days or even months to form and to recede because of var… A picture posted by OWS Development Fund is which is operating in Somali Regional State, show the devastation of recent flooding. So flooding in Ethiopia affects many people in the region who depend on the Nile River for their livelihoods. After circulating through the oceans, evaporating to the sky, condensing into clouds, and precipitating to land, water drains into streams and flows back to the ocean. The Blue Nile begins in Lake Tana in the northwest Amhara region, and it provides an average of 58% of the Nile’s waters in Egypt, which is the most of any of the three main river sources. Officials have said at least 22 died in flooding there in October, the Associated Press reported. The loss of vegetation cover (by deforestation, drought, or other natural causes), loose soil, urbanization, land covered by impervious surfaces, and steep slopes are the main factors that affect the amount of soil erosion and thus increase the damage caused by flooding. … (2006) Natural Hazards: Earth’s Processes a Hazards, Disasters, and Catastrophes. The short rainy season in southeastern Ethiopia typically runs from October to January. They caused more than 430 deaths, notably in Kenya and Rwanda. Orthographic lift occurs more often in areas around the trade winds (which is denoted as between the equator and 30 degrees) with high elevation. Retrieved from http://www.geoforcxc.com/water/river-features/. The largest flows tend to occur at locations where topographically high areas are oriented perpendicular to path of storm clouds with high moisture content. Flooding causes many problems, including the erosion of the top-most layer of soil (which is often the most fertile), property damaged, downstream increases in sediment, increase of fertilizer used in agriculture (due to loss of most nutrient-rich topsoil), and more pollution downstream (due to applied fertilizers upstream). This can be seen in Ethiopian flatlands to the south, which are closer to large water bodies such as the western Indian Ocean, but the central high plateaus of Ethiopia experience the majority of precipitation and flooding due to the high elevation and mountains in this region. Record floods cause deaths and widespread damage in Sudan August 28, 2020 September 4, 2020 Ethiopian Monitor #flood , #Nile river , #Sudan KHARTOUM – Floodwaters in Sudan have reached the highest levels on record, killing dozens of people, destroying thousands of homes and encroaching on some neighborhoods of the capital Khartoum. However the effects of this increased precipitation can be felt far away as the flood waters can reach distant areas that are low lying and these low-lying areas will also experience a more disastrous effect, especially where many people live close to the banks of rivers in a valley. General causes of flooding This year's flooding along Awash river was mainly caused by heavy rainfall in the eastern highlands and escarpment areas of North Shewa and Welo and not because of heavy rain in the upper watershed areas (i.e. (2014) Indo-Pacific Sea Surface temperature influences on failed consecutive rainy seasons over eastern Africa. ADDIS ABEBA – Afar region has announced the unprecedented flood caused by the overflow of Awash River has left 144, 000 homeless and caused the destruction of properties worth over 5 billion Birr. National Oceanographic and Atmospheric Administration. National Meteorological Agency Federal Democratic Republic of Ethiopia. The slope of a drainage basin (the total area of land where water flows into an individual stream) will determine how water will interact with the river in terms of erosion and flooding. Creating higher potential for damages to individuals, structures, agriculture, and livestock. The October weather forecast by the National Meteorology Agency (NMA) indicated that the expected dominantly above normal rainfall will prevail across the … There are three main seasons called the Kiremt (rainy season from June to September), Belg (light or sporadic rains from March to May), and Bega (dry season from October to February). Many impervious surfaces can be found in urbanized areas. The speed of water flowing through a river coupled with the depth of the river is called discharge and it can impact the river’s erosion of the surrounding landscape. Doi: 10.1002/joc.1623. Most of the water comes between August and December. The multidimensional causes of flood hazard and limited landscape based mitigation strategies in the study area have worsen the impacts of flooding. Most precipitation will occur on the windward side of the mountain ranges (or the side that is facing the oncoming wind). A long duration or rainfall in a large river watershed or short and heavy precipitation in a small watershed both cause large flows in rivers. The flooding comes despite Ethiopia starting to fill the reservoir behind a giant new dam upstream on the Blue Nile in July. Urbanization, and the changing of land use from vegetation to impervious surfaces along streams and rivers increases the hazard posed by floods. Damage from flooding is often large due to the combination of fast-moving water and the many people who live, work, and develop property along a river. Ethiopia is unique as its highlands are one of the three main catchments for the Nile River, making this area extremely important for a huge number of people who depend on the Nile (approximately 10 countries with a total population of 280 million individuals). upstream of the Koka Reservoir). National Weather Service. NASA images courtesy the MODIS Rapid Response Team at NASA GSFC. These places will experience higher magnitude flow of water because the topology will force warm air laden with moisture against the mountains, lifting up the clouds, which cool as they rise and are unable to retain their water so it is released as precipitation. The images are enhanced with infrared light to make water stand out from the surrounding landscape. The region is prone to cycles of flood and drought. This study focused on finding out flood causative factors and the impacts of flooding on the socio-economic sectors of Dire Dawa. (See Drought in Eastern Ethiopia on the Earth Observatory. United Nations Office for the Coordination of Humanitarian Affairs Integrated Regional Information Networks. Unusually large rainfall or snowmelt are examples of the weather and climate abnormalities that cause major floods, however human interactions can divert rivers and change the risk of flooding. “The flooding was caused as the Awash River overflows and affected 10 out of 17 counties in the region.” There was no word of any deaths. Climate Dynamics, 43, 1645-1660. The biggest factors that determine flood height and size are climate, topography of local land, and basin size. National Meteorology Agency Director-General, Fetene Teshome, said intense rainfall in the rainy season could pose unprecedented flooding and land sliding risks in some parts of Ethiopia. A project done for GEOG 2137 at GWU, by Lotanna Obodozie, LJ Conley, Frankie De Cristofaro, and Alex Rodgers. This ongoing cycle influences how much water a river usually holds and its capacity to overflow causing damaging floods. Pale blue pools along the river are shallow, silt-laden water or muddy ground. Blodgett, Ronbert H., & Keller, Edward A. Flood is a natural disaster and causes loss of life and property destruction. One of these is the Awash River Basin located in the Rift Valley and with a surface area of about 113,000 km2, which has the largest level of … Almost 45% of Ethiopia is resting on a high elevation plateau with many mountains. 2012) revealed that flood was caused by encroaching to riverbanks, poor housing, lack of early warning information, dam breaking, heavy rainfall, dumping solid waste in drainage channels and land use changes. Funk, C., & Hoell, A. BY ELIZABETH EQUBAY – Flooding around Libo Kemkem area of Amhara region of Ethiopia today kills two people, state broadcaster reported.. Erosion over a long period can create large floodplains adjacent to rivers because sediment that has been eroded away eventually settles creating a flat area on either side of a stream. ADDIS ABABA — Around 217,000 Ethiopians have been displaced by the worst floods in several decades, an Ethiopian minister has said. Seasonal rains continued to increase in most parts of East Africa during the fourth week of April 2020, resulting in a significant increase in rainfall that caused the deadly floods in Ethiopia … How regional weather systems effect flooding in Ethiopia. The floods also destroyed crops, cut off transport, and killed three people, said the United Nations. Flood usually occurs at irregular intervals and varies in magnitude, duration and the area affected by flood. Erosion of soil worsens flooding. Importance of the Nile River’s origins in Ethiopia, Weather systems affecting Ethiopian rainy seasons, Impact of El Nino events and Sea Surface Temperatures on rain in Ethiopia, Droughts and desert effects on floods in Ethiopia, Importance of the Nile River’s origins in Ethiopia, http://www.meteo-ethiopia.net/climate.htm. Floods in the US: Where they happen and why? US Geological Survey Circular, 1245. Addis Abeba, Oct. 09/2019 –Areas along the Baro River bed flooded following heavy rains, 353 households displaced On 2 October, heavy rainfall in Gambella Town has led to the overflow of Baro River, flooding areas along the river bed. Floodplains are the flat areas created from years of overflowing channels of rivers and streams. The movement of storms coupled with location relative to sources of moisture (such as oceans) and the orientation of mountains effect where rain will fall, most often occurring when mountains are perpendicular to the direction of cloud and storm movement. In terms of weather, warmer air has higher capacity to hold water; the higher the topology (like mountains) the more likely a region is to experience orthographic lift thus causing precipitation. Intense Seasonal Floods in Southern Africa, NASA Goddard Space The floods forced more than 52,000 people to leave their homes along the Wabe Shabele and other rivers in the region, said the United Nations Office for the Coordination of Humanitarian Affairs. Compared to October 26 (lower image), the river has widened. The short rainy season in southeastern Ethiopia typically runs from October to January. Indo-Pacific Sea Surface temperature influences on failed consecutive rainy Seasons over Eastern Africa green accent the landscape... The main source of water NASA images courtesy the MODIS Rapid Response Team at GSFC. Pools along the river has widened to a unique causes of flood in ethiopia of regional Climatology, 28 ( 13 1723-1734! 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