Abstract

Aquifer geometry is a critical parameter in estimating the ground water resource and prepare management plan in a given area. Further, there is a wide variability in sub-surface disposition of aquifer system in hard rock areas and hence there is large spatial and temporal variation in hydraulic parameters. In the present study the aquifer systems that are present and their three- dimensional distribution in the subsurface have been demarcated in Lodhika Watershed, Rajkot district, Gujarat state, a hard rock terrain comprising of basaltic rock formation. The hydrogeological parameters have been estimated by integrating satellite and hydrogeological data. It is found that there is large spatial variation in aquifer geometry and the distribution. Numerous depressions (sub-surface basin) on basement surface have been identified with the help of 2D & 3D interpolation techniques. These depressions play important role in understanding the aquifer storage and retrieval. The study also brought out that in each hydrogeomorphic unit primarily interpreted from satellite data further comprises of more than one aquifer in the subsurface. It is also brought out that the limitations of conventional sampling techniques in estimation of representative hydraulic parameters can be overcome by using the present approach .100X100 mts grids are generated to make management plan at micro level.
• Chief Engineer, National Water Development Agency
• Trimble Customer – IIT Delhi
• Gisjbert Noordam, Product Manager , Bentley Systems
• APSRAC