Laps Time for Rise and Fall in Groundwater Level and Groundwater Fluctuation Studies in Basaltic Terrain of Solapur District, Maharashtra, India

 Hydrogeological investigations provide information for planning, delineation, evaluation, exploitation and management of groundwater resources. The main input, rainfall, plays an important role in fluctuation of water table. Depending upon the hydrogeological characters of the subsurface the rate of recharge after the rainfall event decides the groundwater levels and there is always a time gap, which is defined as laps time to attain the maximum water level and subsequently there is a time gap for attaining lowest water level which is also a function of Geology and differences in the heads provide the flow of water from higher potential to lower potential. This flow of water brings down the water levels increasing the gap between the surface and the water table which is designated as the vadose zone. The dynamic resource in the groundwater reservoir is governed by the vadose zone, through which water level fluctuates. Thicker the Vadose zone more is the space available for groundwater accumulation. Further the aquifer parameters transmissivity and storage coefficient are important parameters to decide the groundwater potential in an area and helpful in determining the capacity of aquifer to store water and the ease with which water can flow through permeable zones. Also this helps in delineating areas feasible and non-feasible for artificial recharge. Therefore these studies has been done in the Dhubdhubi basin, a sub basin of Bhima river, which covers part of South Solapur and Akkalkot Talukas of Solapur District Maharashtra, located on survey of India Toposheet no.47 0/14, 47 0/15, 56 C/2 and 56 C/3 on the scale of 1:50000, lies between latitude 17⁰ 21' to 17⁰ 41'N and longitude 76⁰ 00' to 76⁰ 11'E covering an area of 450 sq.km