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~~ <br />Mr. Forrest Luke <br />February 2, L995 <br />Page Four <br />Mannings Equation: <br />Q° 1.486~yiS~ <br />n <br />Where Q =Peak discharge from storm event (cfs) <br />n = Mannings roughness coefficient <br />A =Cross sectional area of flow (ft=) <br />R =Hydraulic radius (ft) <br />S =Channel slope (ft/ft) <br />• <br />• <br />A Manning's Roughness Coefficient of 0.035 was used as a general reference for an earthen <br />channel, (Roberson/Crowe, 1990, pg. 440). <br />Where Velocity exceed 5 feet per second, rip-tap or equivalent will be required. <br />A summary of the inputs and results can be found on the attached table. In addition, all inputs <br />and results can be found in the attached SEDCAD+ computer printouts. If you have any <br />questions or require any further information, please don't hesitate to cal(. <br />Sincerely, <br />TercaMatrix Inc. <br />`f-`~IJI`~- <br />Patrick G. Corser, P.E. <br />Principal <br />~~- ~~~ l~ <br />Thomas E. Leidich <br />Project Engineer <br />9~~:~~ <br />Daniel G. Gleason <br />Staff Engineer <br />TEL: ksp <br />enclosure <br />