[Environment and Engineering Geophysical Society Symposium on the Application of Geophysics to Engineering and Environmental Problems 1998 - ()] Symposium on the Application of Geophysics to Engineering and Environmental Problems 1998 - DC‐Resistivity Multi‐Electrode Profiling in Hydrogeological Investigations: A Comparative Study of the Pulled Array Continuous Electrical Sounding Method and a Multi‐Electrode Method with Fixed Electrodes