The researchers developed a rainfall-runoff model to simulate floods in dry mountain areas, focusing on the Dez River Basin in Iran. They used the Watershed Modelling System software to model rainfall turning into runoff, which is crucial for predicting floods. By analyzing historical storms, they found that certain parameters like CN and STRTL have a big impact on peak flow and runoff volume. This sensitivity analysis helps improve the accuracy of hydrological simulations and can be used to forecast flooding in the future.