Sensitivity indicator of groundwater bodies (regions Brittany and Pays de la Loire)

The sensitivity indicator of groundwater bodies on the territory of the West RID measures intrinsic vulnerability (“pollution propagation speed to [...] groundwater” and water table defence capability) and is calculated from the crossing for each polygon (corresponding to the finest hydrogeological entity on a column of several hydrogeological entities) between the environment of the hydrogeological entity (porosity, crack, fracture, permeability), the nature of the hydrogeological entity (aquifer, semi-waterproof or waterproof unit), the state of the tablecloth (free, semi-captive, captive) and efficient rain (unprecise because only data collected at the departmental level).