This study includes laboratory measurements using different models in
order to determine the effect of wall-phenomenon on the electrical resistivity
measurements, and field applications. This phenomenon had been studied in
the case of homogeneous
medium of which the resistivity is constant, and in the
case of unhomogeneous medium, composed of two or three different layers. It is
found that the effect of this phenomenon is the same although the medium
resistivity is different or with the increase of the number of layers. This
phenomenon changes according to the measurements conditions such as the
measurements direction concerning the edge of slope or wall, the distance
between AB electrodes, and the distance between the configuration and the
wall.