Electrical Resistivity Technique for Exploration and Studies on Flow Pattern of Groundwater in Multi-Aquifer System in the Basaltic Terrain of the Adila Basin, Maharashtra

More than 250 resistivity soundings with Wenner array have been conducted in the basaltic terrain of the Adila basin with an area of about 585 sq km around Solapur, Maharashtra. The resistivity sounding curves have been interpreted in two phases first, by curve matching and later by computer-Aided techniques. Some of the sounding points were chosen near the existing boreholes so as to correlate the sounding results with the borehole lithologs. The potential zones for groundwater accumulation in different horizons were identified by preparing the structure contour maps for the first, second and third interfaces and correlating them with geology and water table contour maps. The earth-sections obtained by interpreting the resistivity soundings are shown as three profiles along NE-SW, NW-SE and E-W directions. The numbers of successful borewells in different villages are also shown in these profiles. In all, 100 locations for the purpose of irrigation were recommended for drilling and 85 of them proved successful.