• Ramesh C Gudepu
• G. Udayalaxmi
• Megha Shinde (Daga)

The main objective of the present study is to identify suitable locations for artificial groundwater recharge structures with Vertical Electrical Sounding (VES) and Geographic Information System (GIS) in the SA-2 mini-watershed area located in the Sina river basin, Ahmednagar district, Maharshtra. Seventy two Vertical Electrical Soundings were carried with Schlumberger configuration, a comprehensive overview of the VES results for the nine separations AB/2= 6, 10, 15, 20, 30, 50, 60, 80 and 100m have brought out the spatial resistivity variation in the study area. The Apparent resistivity maps to evaluate the qualitatively subsurface resistivity distribution and proposed recharge structures in different geological formations. Thematic layers such as Geology, Geomorphology, Land use land cover and Drainage were integrated with water levels data to prepare the recharge structures map. The artificial recharge structures are proposed like recharge shaft, recharge pit, recharge trench, check dam and percolation tank in the study area. In addition to the qualitative analysis of apparent resistivity data in few locations revealed that resistivities of 100-200 Ωm and above 200 Ωm correspond to hard rock formations, indicates hard massive basalt. Apparent resistivity maps show AB/2= 60, 80 and 100m indicates low recharge zone. North, east, and west side of the miniwatershed area covered exposed rocks and hilly terrain shows high resistivity range. Moderate recharge structures resistivity range shows 50-80 Ωm and 80-100 Ωm and Geologically vesicular/amygdolidal basalts.The apparent resistivity maps shows AB/2= 20,30 and 50m indicates moderate recharge zone. Apparent resistivity maps show AB/2= 6, 10,15m indicates good recharge structures. The water bearing formation resistivity range is 30-50 Ωm. Middile part of the miniwatershed area shows along the river good recharge structures. This phenomenon is dependent of lithology 30% of the area indicates that weathered rocks and vesicular /amygdaloidal basalts are moderate to good aquifers indicates only central portion are considered good recharge structures. These recharge structures zones were categorized as high, moderate, and low.

Groundwater, VES, Schlumberger method, Recharge structures, Aquifer and potential zones, Iso resistivity map, Interpretation, GIS

"Spatial Subsurface apparent resistivity distribution using different current electrode (AB/2) configurations (VES) and GIS in the miniwatershed, Ahmednagar, Maharashtra, India.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.10, Issue 1, page no.e580-e592, January-2023, Available :http://www.jetir.org/papers/JETIR2301479.pdf

"Spatial Subsurface apparent resistivity distribution using different current electrode (AB/2) configurations (VES) and GIS in the miniwatershed, Ahmednagar, Maharashtra, India.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.10, Issue 1, page no. ppe580-e592, January-2023, Available at : http://www.jetir.org/papers/JETIR2301479.pdf