The overall permeability of each geological unit has been interpreted to produce an index of the
vulnerability of groundwater occurring in Glasgow, and provides a broad-based view of both the
vulnerability of groundwater and the location of the more permeable aquifers in Glasgow.
The data used to interpret the groundwater vulnerability index are derived from the 1:50 000
DigMap bedrock and superficial geology coverage. The GIS and associated maps should not
therefore be used at scales larger than 1:50 000. Locations of thick clays have been interpreted
and drawn based on BGS borehole records. Information on water boreholes is derived from the
British Geological Survey Scottish Water Borehole database
