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48 <br /> TR55 Tc Worksheet <br /> Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2011 by Autodesk,Inc.v8 <br /> Hyd. No. 1 <br /> Pre-Dev Site <br /> Description A B C Totals <br /> Sheet Flow <br /> Manning's n-value = 0.400 0.011 0.011 <br /> Flow length (ft) = 100.0 0.0 0.0 <br /> Two-year 24-hr precip. (in) = 3.60 0.00 0.00 <br /> Land slope (%) = 2.00 0.00 0.00 <br /> Travel Time (min) = 20.25 + 0.00 + 0.00 = 20.25 <br /> Shallow Concentrated Flow <br /> Flow length (ft) = 1101.00 0.00 0.00 <br /> Watercourse slope (%) = 4.09 0.00 0.00 <br /> Surface description = Unpaved Paved Paved <br /> Average velocity (ft/s) =3.26 0.00 0.00 <br /> Travel Time (min) = 5.62 + 0.00 + 0.00 = 5.62 <br /> Channel Flow <br /> X sectional flow area (sqft) = 36.00 0.00 0.00 <br /> Wetted perimeter (ft) = 17.00 0.00 0.00 <br /> Channel slope (%) = 0.91 0.00 0.00 <br /> Manning's n-value = 0.050 0.015 0.015 <br /> Velocity (ft/s) =4.70 <br /> 0.00 <br /> 0.00 <br /> Flow length (ft) ({0})219.0 0.0 0.0 <br /> Travel Time (min) = 0.78 + 0.00 + 0.00 = 0.78 <br /> Total Travel Time, Tc 26.60 min <br />