In The Netherlands, an integrated policy concerning the restoration of river ecosystems has been developed by the National Government. For these rehabilitation projects, TNO was asked by the Dutch government to investigate the environmental problems these project will face during realization. To reach this goal, a PC meta-information system called MIMIKRI has been developed. An example for the nature rehabilitation project “Gelderse Poort”, one of the priority projects along the Dutch rivers Rhine and Waal (Walloon) will be given.