Groundwater vulnerability map: the Unsaturated Zone

The map of the vulnerability of the groundwater of the Flemish Region can be defined as a map of the level of risk of contamination of the groundwater in the upper water layer by substances penetrating the ground from the soil, taking into account only static parameters. This map can later serve as a basis for a more detailed map, which can also include dynamic and hydrochemical factors. However, where the top recoverable aquifer is naturally salinized (>>The unsaturated zone: In the absence of a coating, the unsaturated zone for the protection of groundwater is taken into account. The thickness determines the classification of the unsaturated zone. There are two classes: * 10 m or less than 10 m thick; * more than 10 m thick.