HCOV_0400, thickness of the Oligocean Aquifer 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_0400 (Oligocene Aquifer System) includes the complete aquifer system between the closing layers of the Boom clay (Formation of Boom) and the Bartoon clay (Formation of Maldegem). This is a sequence of aquifers, whether or not in contact with each other, separated by non-continuous clay layers of limited size. This main unit is formed by the layers belonging to the Formats of Bilzen, Borgloon, Sint-Huibrechts-Hern and Zelzate. The dataset “HCOV_0400, thickness of the Oligocean Aquifer system” shows the thickness of this hydrogeological layer in a grid per grid cell.