HCOV_0900, base of the Ieperian quitard system

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_0900 (Ieperian Aquitard System) is the most important part of the Ypres Group. This is the better known Ypres clay. It contains the Silt of Kortemark, belonging to the Formation of Tielt, and the various clay layers of the Formation of Kortrijk. Globally, the Ieperian Aquitard system forms a highly impermeable layer. The dataset “HCOV_0900, base of the Ieperian quitard system” shows in a grid per grid cell the altitude value (in m TAW) of the lower limit of this hydrogeological layer.