Assessment of Ground Water Hazard Vulnerability of Jamnagar Area, Gujarat, India, using DRASTIC Method and GIS Techniques

Jamnagar district is a coastal district of Gujarat. Groundwater hazards identified in the area are inherent salinity of rocks, sea water ingression and chemical pollution of groundwater. Four talukas namely Lalpur, khambhaliya, Bhanvad and kalyanpur of the Jamnagar district have been selected for the ground water vulnerability study using Remote Sensing and GIS techniques. DRASTIC method that is Depth to water table, Net recharge, Aquifer media, Soil media, Topography, Impact of Vadose zone and Hydraulic conductivity (DRASTIC) have been considered and evaluated for assessing ground water hazard vulnerable zones of the study area. Various thematic maps have been prepared and integrated with the geohydrological data in the DRASTIC model for the development of Ground water vulnerability Index Map in GIS environment. Based on Drastic Index, study area has been divided into three ground water vulnerability zones that is Low (<100), Medium (100-140) and High (>140). It indicate that 85.31% area is highly vulnerable, 11.25% medium and 3% low. These classes represent the relative potential of contamination of ground water within the study area. Ground water vulnerability map will help the planner in decision making for the prevention of contamination and development of systematic groundwater management plan.