Gis Based Groundwater Vulnerability Mapping Of Atebela River Catchment Sebeta Area

This research work which focuses on Atebela groundwater catchment found inrnSebeta–Alemgena area applied the DRASTIC MODEL to the assessment ofrngroundwater vulnerability to contamination. The area is characterized by recentlyrnexpanding industrial activities around Sebeta town and modern and traditionalrnagricultural practices all around which have polluting potential of the groundwaterrnsystem. Both intrinsic vulnerability and specific vulnerability assessment andrnmapping are conducted in the objective of classifying vulnerable and non vulnerablernareas, and to provide zoning for groundwater protection.rnThe mapping process involved GIS (ArcGIS 9.1 software) application and modelrnbuilder extension in ERDAS 8.6 software. The specific vulnerability of groundwaterrnto nitrate contamination and hazard centers was assessed and mapped. Thernvulnerability maps are presented in a clear and easily understandable format for thernuse by policy makers. These maps are useful to develop an appropriate legislativernframework for the protection and sustainable use of the groundwater resources andrnfor water pollution prevention of the groundwater of Atebela River catchment.rnTherefore, the vulnerability maps can be one tool that helps to achieve thernMillennium Development Goals (“ensure environmental sustainability”).rnKeywords: DRASTIC Model, intrinsic vulnerability, specific vulnerability, nitraterncontamination, hazard centers, GIS mapping.

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