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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 3 <br />Sheet Flow <br />Mannings n = 0.24 <br />Flow Length (ft, max 300 ft) = 300 <br />24 hr Rainfall, P2 (in) = 1.8 <br />Land Slope, s (ft/ft) = 0.177 <br />Tt (hr) = 0.319 <br />Tt (min) = 19.2 <br />Shallow Concentrated Flow <br />Flow Length, L (ft) = 1389 <br />Watercourse Slope (ft/ft) = 0.042 <br />Average Velocity, V (ft/sec, fig 3 -1) = 3.2 <br />Tt (hr) = 0.121 <br />Tt (min) = 7.2 <br />Channel Flow <br />Cross Sectional Flow Area, a (ft = 1 <br />Wetted Perimiter, p„, (ft) = 1 <br />Hydraulic Radius, r = a/p„, (ft) = 1.00 <br />Channel Slope, s (ft/ft) = 0.01 <br />Manning's n = 0.035 <br />V ( ft/sec) = 4.26 <br />Flow Length, L (ft) = 0 <br />Tt (hr) = <br />Tt (min) = <br />Watershed or subarea Tc = <br />Lag time (hr) = <br />Lag time (min) = <br />0.440 <br />0.264 <br />15.83 <br />T 0.007 (nl) 0.8 <br />= <br />P 05 04 <br />2 <br />L <br />T t <br />3 600 V <br />1. r 2" s l /2 <br />V = <br />n <br />L <br />T — 3600 V <br />