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To support collaborative simulation processes on common hydro-science and -engineering projects in research and education, distributed numerical simulation environments are needed. For single task in collaborative working processes on water related engineering, a number of hydroinformatics tools have been developed. These hydroinformatics tools integrate geographical information systems (GIS), visualization, net communication, database management systems and numerical simulation software. Examples are tools usable for dynamic interactive WWW-documents, distributed and interactive visualization tools and the online linkage of WWW-applications to GIS-modules.Advanced numerical simulation environments serving completely distributed working processes demand a distributed www-based information management to allow the online information sharing. Therefore, the traditional principle of information exchange has to be extended by the principle of information sharing. Dedicated WWW-based tools for online editing input information of simulation software (such as topography editors, initial and boundary condition editors), online controlling simulation software and online visualization and documentation of simulation results are needed. Within a joint German-Taiwanese research project, a prototype of a distributed numerical simulation environment based on a common shared information base is developed and applied in water related engineering projects in research and education.In the contribution to the conference, the concept of distributed numerical simulation environments, focussing on the shared information base as core component, will be explained. Its application in 2D hydrodynamics will be shown on examples from river and coastal engineering. The societal impacts of the new information sharing paradigm compared to the traditional information exchange approach will be explained and demonstrated.