Groundwater Vulnerability Card: the coating

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 groundwater in the upper water layer by substances that penetrate from the soil into the ground, only taking into account static parameters. This map can later serve as a basis for a more detailed map, which can also include dynamic and hydrochemical factors. Where, however, the top recoverable aquifer is naturally silted (>>the coating: If coating is considered, the layer that occurs above the aquifer layer. Taking into account the excavation for buildings, canals, canals, etc., the coating must be at least 5 m thick to provide sufficient protection. If it is less than 5 m thick, it is assumed that a coating is missing. A sandy formation is not considered a protective coating. The nature of the rock, thickness and hydraulic resistance are decisive in the classification of the coatings. There are three classes: *no coating (less than 5 meters and/or sandy); *a limp coating; *a clayy coating. 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 groundwater in the upper water layer by substances that penetrate from the soil into the ground, only taking into account static parameters. This map can later serve as a basis for a more detailed map, which can also include dynamic and hydrochemical factors. Where, however, the top recoverable aquifer is naturally silted (>>the coating: If coating is considered, the layer that occurs above the aquifer layer. Taking into account the excavation for buildings, canals, canals, etc., the coating must be at least 5 m thick to provide sufficient protection. If it is less than 5 m thick, it is assumed that a coating is missing. A sandy formation is not considered a protective coating. The nature of the rock, thickness and hydraulic resistance are decisive in the classification of the coatings. There are three classes: *no coating (less than 5 meters and/or sandy); *a limp coating; *a clayy coating.