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C~ <br />• <br />q25 = 658 x 0.008138 x 0.75 = 4.02 cfs <br />Use 4.33 cfs for Emergency Spillway. <br />• <br />EMERGENCY SPILLWAY CAPACITY <br />Precipation: <br />P25 = <br />Runoff: <br />Q25 = <br />1.8 inch(es) (25)-year, 24-hour precipitation <br />event from the Precipitation-Frequency Atlas <br />of the Western United States, Volume III - Colorado). <br />P25 - 0.25)2 = ~1.8 - 0.2 (1.49) <br />P25 + 0.85 1.8 + 0.8 (1.49) <br />= 0.75 inch <br />Solution: <br />25-year, 24-hour Peak Discharge <br />q25 = qp Ad Q25 <br /> <br />