The gehydrological situation of the Western part of the Netherlands

Abstract

This paper gives a conspectus of the geohydrological situation of the area. Based on surveys carried out during the last decade. Not only a description of the geological situation to establish which layers in the subsoil have importance for groundwater flow has been given, but also the hydrological properties of the observed layers were calculated. It appeared that there is a basic difference between the geohydrological situations in the northern and the southern part of the area studied. The observed variations in transmissivity mostly are due to differences in thickness and less to different hydraulic conductivities. Beside this the hydrological units appeared to belong to layers of different geological origin. Also, intercalating clay layers may divide stratigraphic units in parts belonging to different aquifers.