The aquifer media layer is created by direct assignment of aquifers to A index values from 1-10. The metamorphic and igneous rocks were given the lowest ‘A’-value of 3 and the karstified limestone is given the highest value of 10. The majority of the catchment can be grouped into bedded sedimentary rocks and given a value of 6.
The GSI National Aquifer Map was reclassified as per DRASTIC methodology. It was created using ESRI ArcMap 10.5 and QGIS as a shapefile and converted into .tiff format