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Rational Method Runoff <br /> BASIN A-1 <br /> Job No: <br /> Client: C116wx MOlkbdew[n <br /> Location: iieiaieisonlls: <::`:;':::::r'; ;i:?S`:';"?; <br /> Latitude: w-56-3fl :' ; :'• ; <br /> Longitude: t1(r20?2�:::ttis;.,:::.,:i::: <br /> Site Conditions <br /> Time of Concentration Length Velocity Time <br /> Total Area 2.14 Acres ft fps Min. <br /> Length along Drain ft. Overland Flow 222 1 3.70 <br /> Fall along Drain R Overland Flow 71 1 1.18 <br /> Channel Flow 0 3 0.00 <br /> Channel Flow 0 1 0.00 <br /> 0 1 0.00 <br /> Total Tc 4.88 minutes <br /> Runoff Coefficients <br /> Area <br /> Acres Ce Product <br /> Impervious Area 0.26 0.85 0.221 <br /> Pervious Area 1.88 0.11 0.2068 <br /> 2.14 0.4278 <br /> Weighted Ce E7,2lY;r:; <br /> Runoff Calculation <br /> Tc= 4.88 minutes <br /> Full Year NOAA Duration <br /> Return 6-Hr. Rainfall Cf Peak Volume <br /> Period Depth inlhr Modifier unoff(cfs Acre-feet <br /> 2 1.10 2.62 1 1.17 0.06 <br /> 5 1.40 3.68 1 1.64 0.07 <br /> 10 1.70 4.48 1 2.00 0.09 <br /> 25 2.00 5.53 1.1 2.72 0.12 <br /> 50 2.20 6.33 1.2 3.39 0.14 <br /> 100 2.40 7.13 1.25 3.98 0.16 <br /> Partial Duration May-Oct <br /> Return 6-Hr. Rainfall Ct Peak Volume <br /> Period Depth in/hr Modifier unoff(cfs Acre-feet <br /> 2 1.00 2.52 1 1.13 0.05 <br /> 5 1.40 3.47 1 1.55 0.07 <br /> 10 1.63 4.19 1 1.87 0.09 <br /> 25 1.94 5.14 1.1 2.52 0.11 <br /> 50 2.17 5.86 1.2 3.14 0.14 <br /> 100 2.00 6.58 1.25 3.67 0.13 <br /> Figure 2c <br />