G. Engelen, M. van der Meulen and B. Hahn, A Spatial Modelling Tool for Integrated Watershed Management: Lessons Learned from the EU-Project MODULUS, Decision Support Systems (DSS) for river basin management, International workshop April 6 2000 in Koblenz, p.140-158 Bundesanstalt für Gewässerkunde, Koblenz - Berlin, Germany