Electrical Resistivity Data Interpretation for Groundwater Detection in Manimuktha River Basin, Tamil Nadu, India

Abstract

This study deals with Geoelectrical resistivity surveys to delineate fresh water pockets in Manimuktha river basin, Tamilnadu. The study area chiefly consists of hard crystalline rocks. Vertical Electrical Soundings (VES) were conducted at 46 different locations using Schlumberger configuration with maximum current electrodes spread up to 200m. The measured resistivity data were interpreted using IPI2WIN software. The resistivity result shows the first minimum and maximum value is 3.37 to 123Ωm similarly second layer resistivity value is 0.709 to 4465Ωm, third layer value is 12.1458 to 1458Ωm and finally fourth layer resistivity values 1.74 to 2086Ωm respectively. In the thicknesses of first layer is 0.544 to 4.39 m, second layer thickness is 1.2 to 82.6m and finally third layer thickness values 2.73 to 36.3m respectively. The favorable resistivity value 20 to 160Ωm was observed in first layer seven VES locations like 1 to 7, second layer four VES locations 3,7,12,13, third layer six VES locations 1,5,6,7,8 and13 and the fourth layer there no favorable resistivity value 20 to 160Ωm respectively. Hence, these three locations were identified to develop shallow fresh water potential pockets from the interpretation analysis.