GROUNDWATER VULNERABILITY MAPPING IN MYSORE CITY USING GIS AND DRASTIC MODEL

Abstract

The purpose of this study is to interpret the vulnerability zones of groundwater using the DRASTIC modeling method. The main objective of this model is to combine the results using DRASTIC algorithms and Geographical Information System (GIS), and to depict it as an effective method for groundwater pollution risk assessment. DRASTIC Model requires seven environmental parameters such as depth to water-level, net recharge, aquifer media, soil media, topography, impact of vadose zone and hydraulic conductivity of the area. All the parameters were integrated in the drastic model using GIS spatial analysis tools and techniques. The Groundwater Vulnerability Index of the active notes within the study is computed using GIS modeling methods. The Vulnerability index of the groundwater in this region ranges from < 70 to >100. The outcome shows that, when the net recharge is high, the vulnerability is also found to be high. The GIS application of the DRASTIC model is found to be a suitable method for analyzing the groundwater vulnerability in Mysore city.