HCOV_0300, Thickness of the Tree Aquitard

Flanders is made up of a variety of aquifers (sand, gravel, chalk, solid rock,...) and regionally occurring non-aquifers (e.g. clay). The sequence of these aquifers and aquitards has its own coding in Flanders: the Hydrogeological Coding of the Underground of Flanders (HCOV coding). The HCOV coding is made up of hydrogeological main, sub- and basic units. The main unit groups a sequence of geological layers that have the same hydrogeological properties and thus form one whole. HCOV_0300 (Boom Aquitard) corresponds to the very poorly permeable clay layer of the Tree Formation. This is a well localised and homogeneous closing layer. This main unit also counts the lower clay parts of the Formation of Owners, as these are very difficult to distinguish hydrogeologically from the Formation of Tree. The dataset “HCOV_0300, thickness of the Tree Aquitard” shows the thickness of this hydrogeological layer in a grid per grid cell.