Shallow Concentrated Flow Equation <br /> ---------------------------------- <br /> <br /> V = 16.1345 * (Sf^0.5) (unpaved surface) <br /> V = 20.3282 * (Sf^0.5) (paved surface) <br /> V = 15.0 * (Sf^0.5) (grassed waterway surface) <br /> V = 10.0 * (Sf^0.5) (nearly bare & untilled surface) <br /> V = 9.0 * (Sf^0.5) (cultivated straight rows surface) <br /> V = 7.0 * (Sf^0.5) (short grass pasture surface) <br /> V = 5.0 * (Sf^0.5) (woodland surface) <br /> V = 2.5 * (Sf^0.5) (forest w/heavy litter surface) <br /> Tc = (Lf / V) / (3600 sec/hr) <br /> <br /> Where: <br /> <br /> Tc = Time of Concentration (hrs) <br /> Lf = Flow Length (ft) <br /> V = Velocity (ft/sec) <br /> Sf = Slope (ft/ft) <br /> <br /> Channel Flow Equation <br /> --------------------- <br /> <br /> V = (1.49 * (R^(2/3)) * (Sf^0.5)) / n <br /> R = Aq / Wp <br /> Tc = (Lf / V) / (3600 sec/hr) <br /> <br /> Where: <br /> <br /> Tc = Time of Concentration (hrs) <br /> Lf = Flow Length (ft) <br /> R = Hydraulic Radius (ft) <br /> Aq = Flow Area (ft²) <br /> Wp = Wetted Perimeter (ft) <br /> V = Velocity (ft/sec) <br /> Sf = Slope (ft/ft) <br /> n = Manning's Roughness <br /> <br /> -------------------- <br /> Subbasin BASIN-L1 <br /> -------------------- <br /> <br /> User-Defined TOC override (minutes): 5.00 <br /> <br /> -------------------- <br /> Subbasin BASIN-L2 <br /> -------------------- <br /> <br /> User-Defined TOC override (minutes): 5.00 <br /> <br /> -------------------- <br /> Subbasin BASIN-L3 <br /> -------------------- <br /> <br /> User-Defined TOC override (minutes): 5.00 <br /> <br /> -------------------- <br /> Subbasin BASIN-L4 <br /> -------------------- <br /> <br /> User-Defined TOC override (minutes): 5.00 <br /> <br /> -------------------- <br /> Subbasin BASIN-L5 <br /> -------------------- <br /> <br /> User-Defined TOC override (minutes): 5.00 <br />Autodesk Storm and Sanitary AnalysisAutodesk Storm and Sanitary Analysis