Résumé
Based on the analogy between Darcy’s law for groundwater flow and Ohm’s law for electric current flow, a methodology has been developed to estimate the hydraulic conductivity and transmissivity of hard rock granite aquifer from geoelectrical parameters. The common parameter, aquifer thickness (
t), has been used to combine the two relations and form an analytical equation. Mathematical relation shows a negative correlation between hydraulic conductivity and aquifer resistivity, and a positive correlation between transmissivity and longitudinal conductance. The methodology has been calibrated and validated in hard rock granite aquifers in India. The good agreement between aquifer hydraulic conductivity (
K) and transmissivity (
T) obtained from the resistivity sounding parameters and those obtained from pumping test analysis proves the potentiality of the methodology. It has been applied to estimate the
K and
T from the surface electrical resistivity parameters and results were utilized to prepare the
K and
T maps of Maheshwaram watershed in hard rock terrain in India.