Laserfiche WebLink
<br />• Peak Flow Calculations (For 1980) <br />10-Year, 24-Hour Storm <br />Avg. slope = 11$ (assume) <br />Area = 213 Acres <br />Tc = 0.47 hr. <br />Peak Flow = 195 cfs/inch of runoff (pg. D-5 TR 55) <br />195 x 0.99 = 193 cfs <br />Adjust to 11$ (Table E-1 TR 55) <br />193 x 0.89 = 172 cfs <br />Check <br />213 acres = 0.33 sq. in. <br />Tc = 0.47 = Peak Disc(zarge = 520 csm (pg. 11 Peak Flows in <br />Colorado) <br />520 x 0.99 = 514 cfs <br />514 x 0.33 = 170 cfs <br />• 25-Year, 24-Hour Storm <br />Peak Flow = 195 cfs(in runoff @ 16$ slope for 11$ slope <br />195 x 0.89 = 174 cfslin runoff 25 yr., 24 hr. event = 2.1 inches <br />C N 91 (for 1980) = runoff = 1.25 inches <br />174 x 1.25 = 218 cfs <br />• <br /> <br />