Groundwater Vulnerability to Pollution S index map (Soil media) in Catalonia according to DRASTIC
Type of soil media map expressed as an index value according to DRASTIC ranges from 1 to 10. The lowest values in the area (index value of 4) - correspond to loam and silty loam soils and the highest values (index value of 10) correspond to gravel soils or terrains with non-existent soil.
The soil media index map has been assessed considering the different soil textures that result from the pre-existing lithologies. It is based on the Soil Map of Catalunya at 1:250.000 (ICGC, 2018). A direct assignment of "S" index values has been made for each soil type according to DRASTIC ranges.