“…Initially, eight hydrographs were computed in the hydrological modeling, referring to eight different return periods (3, 5, 10, 15, 25, 50, 100, and 500 years), needed for economic modeling in the HEC-FDA. It was decided to adopt the annual maximum 5-day rainfall, computed by the Gumbel model, considering that it is one of the most used probability distributions to estimate extreme rainfall (Ozonur et al, 2021). The HEC-HMS 4.…”