Identification of Groundwater Quality Zones in Tindivanam Taluk, Tamilnadu with the Integrated Approach of Remote Sensing and GIS

Groundwater quality prospective zones of Tindivanam Taluk, Tamil Nadu were investigated and delineated by an integrated approach of remote sensing and geographical information system (gis). Various thematic maps like geology, geomorphology, lineament, drainage, land use/land cover and soil were prepared for the study area. The attribute information pertaining to water quality such as TDS, pH, TH, CR, Cl, have been plotted as point attributes (locations wells) for constructing contours. The selected attributes are based on the purposes of drinking (TDS), domestic (TH), industrial (CR) and agricultural/drinking (CL). The pre and post-monsoon water quality spatial scores are added and the highest positive score is considered as the resulting permissible parameters. The integration of TDS and TH have been done using the command union to obtain the map union1, and CR and Cl integrated to produce union 2 map. By integrating union 1 and union 2, union 3 has been produced, that is the final output map of overlay analysis. The final map is the final output map of overlay analysis. The final map has been categorized into three zones, namely good, tolerate and poor. From the final integrated map, it is inferred that freshwater exists in the north, northeastern and southern part of the study area (144.59 sqkm). The tolerate quality water occupies about (300.74 sqkm) and the poor quality water occupied by 154.89 sqkm.