Application Materials - Laserfiche WebLink

- 4911.98 - 0.72 Composite Area & Weighted Runoff Coeff. 4911.98 0.72 -------------------- Subbasin BASIN-S5 -------------------- Area Soil Runoff Soil/Surface Description (ft²) Group Coeff. ----------------------------------------------------------------------------------------- - 3194.98 - 0.72 Composite Area & Weighted Runoff Coeff. 3194.98 0.72 -------------------- Subbasin BASIN-S6 -------------------- Area Soil Runoff Soil/Surface Description (ft²) Group Coeff. ----------------------------------------------------------------------------------------- - 8252.97 - 0.72 Composite Area & Weighted Runoff Coeff. 8252.97 0.72 *************************************************** SCS TR-55 Time of Concentration Computations Report *************************************************** Sheet Flow Equation ------------------- Tc = (0.007 * ((n * Lf)^0.8)) / ((P^0.5) * (Sf^0.4)) Where: Tc = Time of Concentration (hrs) n = Manning's Roughness Lf = Flow Length (ft) P = 2 yr, 24 hr Rainfall (inches) Sf = Slope (ft/ft) Shallow Concentrated Flow Equation ---------------------------------- V = 16.1345 * (Sf^0.5) (unpaved surface) V = 20.3282 * (Sf^0.5) (paved surface) V = 15.0 * (Sf^0.5) (grassed waterway surface) V = 10.0 * (Sf^0.5) (nearly bare & untilled surface) V = 9.0 * (Sf^0.5) (cultivated straight rows surface) V = 7.0 * (Sf^0.5) (short grass pasture surface) V = 5.0 * (Sf^0.5) (woodland surface) V = 2.5 * (Sf^0.5) (forest w/heavy litter surface) Tc = (Lf / V) / (3600 sec/hr) Where: Tc = Time of Concentration (hrs) Lf = Flow Length (ft) V = Velocity (ft/sec) Sf = Slope (ft/ft) Channel Flow Equation --------------------- V = (1.49 * (R^(2/3)) * (Sf^0.5)) / n R = Aq / Wp Tc = (Lf / V) / (3600 sec/hr) Where: Autodesk Storm and Sanitary AnalysisAutodesk Storm and Sanitary Analysis