The Hydrogeolgic 3D model was drawn up in the framework of the management agreement of the Flemish government with VITO, under the name VLAKO, commissioned by the Flemish Environmental Society. The model includes: — the height in mTAW of the base and the top of the modeled packages in the form of ASCII and XYZ grid files, — the thickness of the modelled packages in the form of ASCII and XYZ grid files, — prevention limits of the packages such as the modelled grids, — break lines through the bases and tops of the different packages, — 3D fracture surfaces of the modeled fractures, — drillings, seismic, and interpretations on which the model is based, — isohypses and isopaching of the packages, All is documented in one main report, with references to subreports.