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The construction of road infrastructures has often affected floodplains next to waterways and the adopted technologies have frequently made use of road embankments designed by assigning an adequate freeboard to the road level with respect to the most severe floods (RT > 200 years). This technique has often led to the reduction of the detention capacity of the floodplain due to the partial exclusion of the area between the road embankments and the outer limits of the valley. Recent developments in Computational Fluid Dynamics (CFD) based on the Navier-Stokes equations or LBM algorithms, have reached a very high level of detail and computational accuracy, even though the presence of structural and hydraulic singularities (road, levees, bridges, ...) often weighs down the computational simulation. Thus the computation procedure can be simplified by means of: efflux laws for bridges; empirical formulas for banks overflow; laws for the synchronous filling of small extension floodplains without significant discontinuities. Aim of this work is to provide a numerical solution that can be easily implemented for engineering applications.
