In this paper a prototypical flood forecasting system for small catch-ment areas is presented. Due to the fact that flood forecasting models for small rivers normally not exist we developed an approach by combining a Continuous Situation Awareness (CSA) component with a workflow component. The CSA component permanently monitors sensor data and detects warnings which are presented to a decision maker. If the decision maker approves a warning, it is reported to the workflow component. The workflow component can dynamically react to changing situations and suggests preventive actions to a further user. That user can build a workflow and send tasks via a mobile client to emergency team leaders.