Deep insight to the complex aquifer and its characteristics from high resolution electrical resistivity tomography and borehole studies for groundwater exploration and development

Kumar, D., Mondal, S. & Warsi, T.,

Summary/Research Highlights

High resolution electrical resistivity tomography 2D data at Garh Khatanga near Ranchi were acquired to probe deep inside the earth up to a maximum depth of 220 m at sixteen sites in three different blocks along a 7.2 km line for prospecting and exploration of groundwater resources. The geophysical inversion of the 2D resistivity data revealed prospect groundwater scenario at six sites based on the hydrogeological interpretation and the significant resistivity contrast between the highly weathered/fractured and the massive rocks. The modeled resistivity sections revealed different degree of weathered, fractured and saturated weathered/fractured strata as well as clearly indicated the presence of a totally hard massive rock within the subsurface lying between ~30 m to 220 m depths. The geophysical anomalies were confirmed and validated by borehole drilling at four sites up to a maximum depth of 215 m with yields ranging from 2.0 to 4.25 inch, which is equivalent to 5632 to 63769 litres/hr of groundwater exploitation. These yields of groundwater resources are rated as good aquifer(s) in the plateau region of Chhotanagpur gneissic complex.






















2D inverted resistivity model and borehole lithology data

J Earth Syst Sci 129, 68, pg. 1-15, (2020);