Traditionally, the evaluation of overtopping on coastal structures is carried out by the combination of meteo-oceanographic information and the analytical evaluation of the variable, through semi-empirical formulae.The meteo-oceanographic variables that allow the analytical calculation of overtopping are, in general, only associated with waves and sea level, with no considerations given to wind and infragravity waves effects. Both variables, wind and infragravity waves, can dramatically modify run-up and ovetopping, specially in reflected beaches. This contribution takes advantage of the waves forecast system SO3, which combines wave and infragravity waves to couple them to the XBeach model, to determine more realistically the run-up and its derived effects, e.g. overtopping. A segment of Caldera beach, located on the Pacific coast of Costa Rica, is used as study place. This site frequently experiences overtopping throughout the year.
