1. Unit Subsurface and Groundwater Systems, Deltares; Utrecht Netherlands
2. Critical Zone Hydrology Group, Department of Earth Sciences; VU University Amsterdam; Amsterdam Netherlands
3. Now at DEME Group; Zwijndrecht Belgium
4. Department Geology and Soil Sciences; Ghent University; Gent Belgium
5. Now at De Watergroep; Brussels Belgium
6. Department of Physical Geography; Utrecht University; Utrecht Netherlands
7. Groundwater Modelling Cell, Department Geology and Soil Sciences; Ghent University; Ghent Belgium