The recurrence interval is equal to (N + 1)/M where N is the number of years of flood records and M is ________.

A. the absolute value of the slope of the falling limb on the hydrograph of a 50-year flood
B. mass of water moved in each year's maximum flood
C. the numerical rank of each year's maximum flood discharge
D. minimum amount of discharge needed to produce a flood
E. the slope of the rising limb on the hydrograph of a 25-year flood


Answer: C

Environmental & Atmospheric Sciences

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