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Cripple Creek and Victor <br />Phase 1 VLF <br />Lag Time Calculation Using Natural Resources Conservation Service TR -55 <br />Watershed Contribution Area 5 <br />Sheet Flow <br />Mannings n = <br />Flow Length (ft, max 300 ft) = <br />24 hr Rainfall, P2 (in) = <br />Land Slope, s ( ft/ft) = <br />Tt (hr) = <br />Tt (min) = <br />Shallow Concentrated Flow <br />Flow Length, L (ft) _ <br />Watercourse Slope (ft/ft) = <br />Average Velocity, V (ft /sec, fig 3 -1) = <br />Tt (hr) = <br />Tt (min) = <br />Channel Flow <br />Cross Sectional Flow Area, a (ft = <br />Wetted Perimiter, p„, (ft) = <br />Hydraulic Radius, r = a/p„, (ft) = <br />Channel Slope, s (ft/ft) = <br />Manning's n = <br />V (ft/sec) = <br />Flow Length, L (ft) = <br />Tt (hr) = <br />Tt (min) = <br />Watershed or subarea Tc = <br />Lag time (hr) = <br />Lag time (min) = <br />0.24 <br />186 <br />1.8 <br />0.250 <br />0.190 <br />11.4 <br />632 <br />0.150 <br />6 <br />0.029 <br />1.8 <br />56 1.49 r213 <br />25.5 V <br />2.20 <br />0.05 <br />0.035 <br />16.08 <br />592 <br />0.010 <br />0.6 <br />0.229 <br />0.138 <br />8.25 <br />T _ 0.007 (n1) <br />T, P °.s s 0.4 <br />2 <br />T = <br />3 600 V <br />T <br />L <br />n <br />L <br />r — 3600 V <br />