HCOV_1000, Paleocene Aquifer System Prevent Area

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. This hydrogeological main unit is mainly formed by the various successive aquifers belonging to the Lands Group (Formations of Ten and Hannut) and the Formats of Heers and Opglabbeek. This is a highly heterogeneous composite aquifer package, in which several less permeable clayy layers are present.