REGIS II is a three-dimensional model of the well-permeable and poorly permeable layers in the subsoil, down to an average depth of about 500 m below NAP, with local outliers up to 1200 m. Well-permeable and poorly permeable layers are called hydrogeological units in REGIS II ; these are layers with more or less uniform hydraulic properties. The hydrogeological units coincide with, or are part of, the lithostratigraphic units distinguished in DGM. The height of the top and bottom and the thickness of the units are recorded in grid files with a cell size of 100 by 100 m. In addition to the geometric data, the model also contains permeability data for each unit. Finally, REGIS II also contains the interpreted bore descriptions that were used in model making. The model area of REGIS II consists of the mainland of the Netherlands. The subsurface of the Dutch part of the Continental Shelf is not included in REGIS II. REGIS II is a regional model. It is not suitable for local scale use; additional data will always be needed to make a local hydrogeological model. For further information, please refer to the website of the BRO: https://basisregistratieondergrond.nl/
