Based on the graph below, what is the approximate discharge (m3/s) associated with a 20-year flood? Schuylkill River at Philadelphia, PA 4000 3000 2000 1000 10 5 2 1 100 50 Yearly Probability (%) 2700 m3/s 2000 m3/s 1800 m/s 315 1100 m3/s Discharge (m3/s) 20

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