The main goal of our system is to provide the end user with information about an approaching disaster. The concept is to ensure information access to adequate data for all potential users, including citizens, local mayors, governments, and specialists, within one system. It is obvious that there is a knowledge gap between the lay user and specialist. Therefore, the system must be able to provide this information in a simple format for the less informed user while providing more complete information with computation adjustment and parameterization options to more qualified users. One system feature in high demand is the ability to display reliable and understandable graphical and textual information. Information for various types of users must be adapted to a desired format which is understandable to a particular group of people. For example, a specialist can ask for all available results from different simulation models in text format. This type of information may be useless, however, to the user who only wants to find out whether or not his house will be flooded. Another important feature is the open structure and modular architecture that enables the usage of different modules. Modules can contain different functions, alternative simulations or additional features. Since the architectural structure is open, modules can be combined in any way to achieve any desired function in the system.