This example illustrates the use of resistivity sounding in the site investigation for a proposed road improvement scheme. Along the route show in figure 7.3
It was necessary to locate the upper surface of the bedrock,which might be at a depth of 10 m or more. The principal solid formation is carboniferous limestone ,this being overlain by glacial drift, which comprises glacial till in the east and glacial sand and gravel in the west. In order to provide information on the thickness and nature of the glacial drift. 18 offset wenner soundings were measured .