Vertical electrical soundings using the Offset Wenner array were carried out throghout Perlis, Peninsula Malaysia to investigate the hydrogeology of the state. The survey has been succesful in locating proper sites for drilling and in determining depths to bedrock. In some cases VES curves show quite clearly the presence of karstic limestone which is the potential source of grundwater in Perlis. Hydraulic transmissivities obtained from pumping tests of 15 boreholes have been correlated with the electrical transverse resistance corrected for porewater resistivity. It shows that an inverse non-linear relation, contrary to the direct relation reported elsewhere for sand and gravel aquifers, exists for karstic limestone aquifers in Perlis. This nonlinear inverse relationship may be useful for predicting aquifer transmissivity in the area surveyed provided the electrolytic resistivity is known accurately.

http://hydrologie.org/redbooks/a161/iahs_161_0221.pdf

Marcello Benedini

Papers

The aquifers and their hydraulic characteristics