Estimating transmissivity from surface resistivity soundings: an example from the Thames Gravels

Surface electrical soundings can be used to extrapolate pumping test results over an area. Using the Dar Zarrouk parameters, a constant can be found which will simply translate resistivity to transmissivity, provided that either clay content or porosity is the primary control on resistivity and permeability. The applicability of the technique is tested on the gravel aquifer at Desborough Island, UK.