The Geological 3D model was drawn up in the framework of the management agreement of the Flemish government with VITO, under the name VLAKO, on behalf of the department LNE - Department of Land and Soil Protection, Subsurface, Natural Resources. It was started in 2007. The version that logs before contains a large package of lithostratigraphic subdivisions of the substrate. In the coming years, this model will be further divided and refined. The model shall include: - the height in mTAW of the base of the modelled packages in the form of grid-asc files and XYZ files, - breaks through the base of the various packages, - prevention limits of the packages, - drillings and interpretations on which the model is based, - 1 main report and 11 side reports to substantiate the model in terms of content. Everything is documented in one main report, with references to sub-reports.