Groundwater investigation and possible zones identification through schlumberger resistivity data using GIS tools in Omalur Taluk, Salem District, Tamil Nadu, India

Abstract

In the present investigation 50 (Vertical electrical sounding) survey were carried out in the study area. Field data were interpreted by curve matching techniques in IPI2WIN software to determine the resistivity and thickness of the different

layers. By using conventional GIS method, the spatial distribution maps for weathered zone and fracture zones resistivity and thicknesses were prepared. Integration of the said themes was carried out in GIS. Integration analysis was carried out with weathered zone thickness and a resistivity map. This map was superposed over geology map. To locate the shallow groundwater zones. Overlay analysis was used in the thickness of first and second layer fracture zone with the corresponding resistivity maps. This map was superposed over geology map. The suitable zones for groundwater were delineated from first layers combinations of low resistivity with more thickness in areas occupied by Dunite, hornblende-biotite-gneisses and

charnockite. Depth for the construction of tube-wells and dug-wells were suggested in the present investigation. Spatial distribution variation results are given in the findings.