National Geological Screening for a GDF - Hampshire Basin region
Our work shows that we may find a suitable geological setting for a GDF in most of this subregion.
Rock can be seen at the surface in a few places in this subregion such as the sea cliffs around Bridport and man-made excavations such as quarries or road cuttings. Combined with some deep boreholes and geophysical investigations, this gives us an understanding of the rocks present and their distribution.
There are clay-rich rock layers under the whole subregion in which we may be able to site a GDF. There are also layers of rock salt between Sherborne and Bridport and extending under the English Channel, and slates and similar strong rocks around Yeovil and Sherborne, in which we may be able to site a GDF. We would need to do more work to find out whether these rocks have suitable properties and thicknesses in the depth range of interest for a GDF.
Even where individual clay-rich rock layers are found not to be thick enough to host a GDF they may support the siting of a GDF in deeper rocks as they could act as a barrier to groundwater flow from depth. This is important because movement of groundwater is one of the ways in which radioactive material could be carried back to the surface.
For further information, read the report below.
We have also produced a summary of the geological attributes of the Hampshire Basin and adjoining areas Region.