Figure 8 shows the weighted average FDCs, where the proportions (Table 5) are applied to the discerned FDCs for deficit and non-deficit years (Figure 6). The discrepancies in the average FDCs for different scenarios are rather large, especially for low durations (Table 6). An example in Figure 9 clearly illustrates the discrepancies for the 10% low duration. As FDC is one of the basic tools for water management, the identified range of uncertainties may be useful for risk assessment studies.