The aquifer media layer is created by direct assignment of aquifers to A index values from 1-10. The majority of the catchment is underlain by karst and the karstified limestone is given the highest value of 10. The remainder of the catchment is considered bedded sedimentary rocks and given a value of 6.
The GSI National Aquifer Map was reclassified as per DRASTIC methodology. It was created using ERSI ArcMap 10.5 and QGIS as a shapefile and converted into .tiff format