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Abstract. The present study estimates the Kerman–Baghin aquifer vulnerability usingDRASTIC and composite DRASTIC (CDRASTIC) indices with the aid of geographicinformation system (GIS) techniques. Factors affecting the transfer ofcontamination, including water table depth, soil media, aquifer media, theimpact of the vadose zone, topography, hydraulic conductivity, and land use,were used to calculate the DRASTIC and CDRASTIC indices. A sensitivity testwas also performed to determine the sensitivity of the parameters. Resultsshowed that the topographic layer displays a gentle slope in the aquifer.Most of the aquifer was covered with irrigated field crops and grasslandwith a moderate vegetation cover. In addition, the aquifer vulnerabilitymaps indicated very similar results, identifying the north-west parts of theaquifer as areas with high to very high vulnerability. The map removalsensibility analysis (MRSA) revealed the impact of the vadose zone (in theDRASTIC index) and hydraulic conductivity (in the CDRASTIC index) as themost important parameters in vulnerability evaluation. In both indices,the single-parameter sensibility analysis (SPSA) demonstrated net rechargeas the most effective factor in vulnerability estimation. According to theresults, parts of the studied aquifer have a high vulnerability and requireprotective measures.

GIS-based DRASTIC and composite DRASTIC indices for assessing groundwater vulnerability in the Baghin aquifer, Kerman, Iran