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Kalypso is an open source application for geospatial modelling and simulation. It is primarily developed to be a user friendly tool for GIS-based modelling and simulation of hydrological and hydraulic numerical models.
The nofdp IDSS is an open source application for modeling flood control measures and 1D hydrodynamic floodsimulation. Additional modules for ecological and spatial analysis, multicriteria evaluation and communication are included.
OpenFlood is a fully dynamic 1D / 2D floodsimulation engine intended to simulate fluvial and tidal flooding using the Saint Venant and shallow water equations.