The methodology has been applied considering both the actual climate conditions of the Montedoglio basin such us defined by hourly time series of rainfall and temperature observed in the period 1989–2010 and the ones derived by considering the perturbed hydrological time series using the seasonal temperature and precipitation trends assessed by analyzing the observed daily time series at the Tiber basin scale for the period 1952-2008 (Romano and Preziosi, 2012).