Gis – Based Groundwater Vulnerability Mapping of Atebela River Catchment, Sebeta Area

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Addis Ababa Universty


This research work which focuses on Atebela groundwater catchment found in Sebeta–Alemgena area applied the DRASTIC MODEL to the assessment of groundwater vulnerability to contamination. The area is characterized by recently expanding industrial activities around Sebeta town and modern and traditional agricultural practices all around which have polluting potential of the groundwater system. Both intrinsic vulnerability and specific vulnerability assessment and mapping are conducted in the objective of classifying vulnerable and non vulnerable areas, and to provide zoning for groundwater protection. The mapping process involved GIS (ArcGIS 9.1 software) application and model builder extension in ERDAS 8.6 software. The specific vulnerability of groundwater to nitrate contamination and hazard centers was assessed and mapped. The vulnerability maps are presented in a clear and easily understandable format for the use by policy makers. These maps are useful to develop an appropriate legislative framework for the protection and sustainable use of the groundwater resources and for water pollution prevention of the groundwater of Atebela River catchment. Therefore, the vulnerability maps can be one tool that helps to achieve the Millennium Development Goals (“ensure environmental sustainability”). Keywords: DRASTIC Model, intrinsic vulnerability, specific vulnerability, nitrate contamination, hazard centers, GIS mapping.



DRASTIC Model, Intrinsic vulnerability, Specific vulnerability, Nitrate contamination, Hazard centers, GIS mapping