The RIONED Foundation (www.riool.net) is the national not-for-profit knowledge centre on sewer systems and urban drainage in The Netherlands. RIONED contracted the University of Leuven and the Delft University of Technology to develop a database on the published results of research projects in the field of urban drainage. The database must give insight in the state of the art of the research in this field, the centres of knowledge on specific themes and must open up the literature to support desk studies. RIONED aims at avoiding double research and better accessibility of literature and centres of specific knowledge. The database will be accessible through the Internet and should be updated regularly to ensure the actuality of the database. To be able to use the database for programming research ongoing research projects should be added too. Therefore a plea is made for the development of a structure for collaboration of knowledge centres. Within this structure the database can be extended and kept up-to-date. Organisations interested to join the development of such a structure should give notice on the RIONED website www.riool.net by following the ‘English’-link.