Hull sits on deep alluvial and glacial till deposits overlying chalk bedrock, so the ground conditions vary significantly within a few hundred metres. A standard borehole alone might miss a sand channel or a perched water table. That is where electrical resistivity and Vertical Electrical Sounding (VES) come in. These geophysical methods map resistivity contrasts in the subsurface, revealing lithological changes, the depth to the chalk, and potential groundwater pathways. Before we mobilise drilling rigs, we often run a resistivity survey to target the borehole locations more efficiently. Complementing this with a calicatas exploratorias allows direct visual confirmation of the shallow stratigraphy identified by the geophysics.
A resistivity survey in Hull often reveals buried river channels and solution features in the chalk that no borehole alone would detect.