The disastrous consequences of hydrological risks are of paramount importance, hence the need to prevent them and minimize their impacts, if not eliminate them. In this perspective, the study of flood-related risks in the Cavally watershed was carried out. The objective was to analyze the risks related to floods using different approaches. The study was based on the frequency analysis of three series of extreme flows constituted from the daily flows measured at the different hydrometric stations. These series of flows are made up of annual maximum flows, overthreshold flows and maximum flows obtained on the annual series on which were applied the moving averages of daily duration d. After the frequency analysis of these variables, the construction of the QdF curves was carried out. The study showed that flood discharge times are higher at Toulepleu and Feté (4 - 40 days) than at Nékaounié and Tiéouléoula (1 - 10 days). The frequency analysis showed that the Weibull, Gamma, GEV and Gumbel laws are the best laws that fit the different flood flow series. The QdF curves obtained from the different variables show that those obtained with suprathreshold values give more satisfaction compared to the maxan values. These QdF curves describing the intensity of daily flows showed quantiles of flows with return periods from 2 to 100 years, all higher than the average flows observed in the watershed, thus demonstrating a high risk of flooding since even the most frequent floods are likely to generate floods. Compared to the results obtained by applying the reference basin models, the analysis of the QdF curves showed that the Vandenesse model is better in the observable frequency domain as well as in the rare frequency domain.