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Rational Method Runoff <br /> BASIN A-2 <br /> Job No: I.Ott:�3;'::......::<.;.::::::: �:';;': <br /> Client Umax:':Motybdentirfl <br /> Location: fientf.Cmn:. <br /> Latitude: a0 530 <br /> Site Conditions <br /> Time of Concentration Length Velocity Time <br /> Total Area 2.63 Acres ft fps Min. <br /> Length along Drain ft. Overland Flow 205 1 3,42 <br /> Fall along Drain ft Overland Flow 0 1 0.00 <br /> Channel <br /> Channel Flow 260 3 1,44 <br /> Channel Flow 0 1 0,00 <br /> 0 1 0,00 <br /> Total Tc 4.86 minutes <br /> Runoff Coefficients <br /> I Area <br /> Acres Ce Product <br /> Impervious Area 1.81 0.85 1.5385 <br /> Pervious Area 0.82 0.1 0.082 <br /> 2.63 1.6205 <br /> Weighted Ce <br /> Runoff Calculation <br /> Tc= 4.86 minutes <br /> Full Year NOAA Duration <br /> Return 6-Hr. Rainfall Cf Peak Volume <br /> Period Depth in/hr Modifier unoff(cfs Acre-feet <br /> 2 1.10 2.62 1 1.44 0.06 <br /> 5 1.40 3.68 1 2.02 0.07 <br /> 10 1.70 4.48 1 2.46 0.09 <br /> 25 2,00 5.53 1.1 3.34 0.12 <br /> 50 2.20 6.33 1.2 4.17 0.14 <br /> 100 2.40 7.13 1.25 4.89 0.16 <br /> Partial Duration May-Oct <br /> Return 6-Hr. Rainfall Cf Peak Volume <br /> Period Depth in/hr Modifier unoff(cfs Acre-feet <br /> 2 1.00 2.52 1 1.38 0.05 <br /> 5 1.40 3.47 1 1.90 0.07 <br /> 10 1.63 4.19 1 2.30 0.09 <br /> 25 1.94 5.14 1.1 3.10 0.11 <br /> 50 2.17 5.86 1.2 3.86 0.14 <br /> 100 2.00 6.58 1.25 4.51 0.13 <br /> I <br /> Figure 2d <br />