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Assessing the Root Causes of Flood and Options for Future Risk Reduction In Relation to the Land Degradation of Dechatu Watershed Dire Dawa Administrative Council

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dc.contributor.advisor Argaw Mekuria (PhD)
dc.contributor.author Tadesse Maria
dc.date.accessioned 2018-07-04T08:40:13Z
dc.date.available 2018-07-04T08:40:13Z
dc.date.issued 2008-12
dc.identifier.uri http://etd.aau.edu.et/handle/123456789/6312
dc.description.abstract Flood hazard has long history in Dire Dawa. Surrounded by the highland areas, the town has often been repeatedly devastated by powerful flood disasters in the past. XI This work aimed at investigating the root causes of flood and the options for future risk reduction in relation to the land degradation of Dechatu watershed, Dire Dawa with the objectives of describing the link between land use and land management practices with land degradation, runoff occurrence and flash floods, and assessing the impact of deforestation on catchments hydrology and occurrence of floods. To do these different techniques were applied. Such as, questionnaires survey of the study area, soil profile study of the up land and lowland to compare soil erosion rate in the upland and its deposition in the lowland and satellite image analysis of 1986 and 2000 using ERDAS 8.6 software in order to compare the land use land cover change of the study area. The major findings of the study showed that most of the farmers in the rural area have a land of less than half a hectare which is only suitable for sorghum, corn and Chat so they are forced to farm on sloppy areas on the route of the flood, and on marginal lands. Large-scale destruction of forest resources in the highland areas has been practiced which has aggravated the rate of flooding in Dire Dawa. The most impressive problem in the rural area is land degradation where as flooding in the urban part of the study area. The soil profile study implies that there is high deposition problem in the lowland area and high erosion rate in the upper rural part, which has aggravated the flood problem by increasing the runoff from the high land and decreasing the river water holding capacity of the river in the lowland because of the soil deposition. The satellite image analysis shows that there is a change in land use land cover, where wood land, shrub land and bare land decrease sand deposit, cultivated area and built up area have increased. Conducting integrated soil and water conservation activities including the construction of hill side terraces, check dams, soil and stone bunds, micro basin , area closure with enrichment cultivation of selected tree species, etc. Identifying weak points through which flooding occurs; and constructing protection walls on identified points; construction of retaining wall and dam at the proposed sites are the main recommendations for the study area. en_US
dc.language.iso en en_US
dc.publisher Addis Ababa University en_US
dc.subject Assessing the Root Causes of Flood en_US
dc.title Assessing the Root Causes of Flood and Options for Future Risk Reduction In Relation to the Land Degradation of Dechatu Watershed Dire Dawa Administrative Council en_US
dc.type Thesis en_US

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