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We present a system for semantically-aided workflow management for SOA-based grid environment. The user can construct workflows of grid and web services just by stating the intended result, can see the workflow and its dynamic behavior in a graphical form, and can annotate the whole workflow, its parts, or its results. User experience, constructed workflows, and computed results can be shared between users. The system uses monitoring information to adapt to changes in the underlying infrastructure by extracting ontologically managed information about existing application services. One of its important features is also a transparency of the grid, and resulting ease of use even for application area experts not familiar with grid computing concepts. We also present the way this system is employed to predict flood hazards, using a series of simulation models for meteorology, hydrology, and hydraulics. The system is the result of the IST project K-Wf Grid.