A mathematical model (ROUTWEIR type) is applied to the evaluation of the influence of a highway embankment during a flood occurred in 1977 in Northern Italy. The whole area involved in the inundation (almost 40 sq km) is represented by a network of triangular cells. The inflow hydrographs of the three rivers crossing the area are evaluated by means of a rainfall-runoff model. The model has been calibrated on the basis of the observed water levels. After calibration, the simulation of the antecedent conditions (prior to the highway existence) has been carried out. Comparing the results with and without the highway in place the impact of the embankment has been determined.
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