Groundwater Vulnerability And Pollution Risk Assessment In The Case Of Upper Awash River Basin

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Water used for different purposes is harvested in the watershed system; largely in the riverrnbasin system. To maintain the requirement of these purposes, both quantity and quality ofrnwater for ecological, social and economical development could be manage appropriatelyrnthrough integrated water resource management. However, scarcity and poor water quality arernthe major challenges of the world due to climate change and water pollutions. Thesernchallenges trigger further ecological, economical and public health impacts. In Ethiopia,rnevidence shows that upper Awash River sub-basin is the most impacted river basin that is whyrnprotection of both groundwater and surface water resources come to an essential approachrnthrough investigation of hazards, vulnerability and consequences of the water sources. Thisrnresearch is designed to identify vulnerable and risk of ground water pollutions so as to indicaternthe requirements of protection of vulnerable aquifer considering seven important factors ofrngroundwater vulnerability as well as land use management. To achieve these objectives,rndigitized data for parameters and secondary data from concerned sectors have been collected. rnThese collected data and Shape files have been analyzed using ArcGIS 10.2 software andrnSPSS version 24. Sensitive analysis, model validation, vulnerability index and risk index havernbeen produced. Accordingly, as the difference in percentage (6.48% - 16.77%) of theoreticalrnweights and effective weights is not much more differ, theoretical weights are used forrnDRASTIC model analysis and also variation index due to removal of each parameter, the mostrnsensitive parameters to groundwater pollution orderly are Impact of Vadose Zone, Depth ofrnwater, Aquifer media, Soil type, Topography, Net Recharge and Hydraulic conductivity. Thernvalidation confirmed that 72% of variation in index values is related with nitrate concentrationrnand a unit increase of nitrate concentration increase vulnerability index by 2.26 times. rnStep by step analysis of each intrinsic parameter has been done. Upper Awash sub basin hasrn18% high and very high vulnerable area; 26% moderately vulnerable area and 57 % very lowrnand low vulnerable areas whereas only 1% of the area is high risk of pollution; 31% of thernarea is moderate risk pollution; and 67% of the area is low risk for groundwater pollution. rnThe output of this study will have greatest advantage for groundwater protection measuresrnprovide that the limitation of environmental variability and qualitative index methods.rnResearchers are recommended to support these findings with field observations and strongrnapproaches for further potential risks of groundwater in those identified vulnerable areas.

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Groundwater Vulnerability And Pollution Risk Assessment In The Case Of Upper Awash River Basin

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