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DITCH CALCULATION <br /> (Using Chezy-Manning Equation) <br /> PROJECT: Premier Co-op Grain Bin 2015 <br /> FILE NUMBER: PC-03-15 <br /> LOCATION: Swale A <br /> Enter the channel characteristics (see Diagram 1): <br /> CHANNEL CROSS SECTION <br /> Minimum Channel Slope(S): 0.20 feet/feet <br /> 10 Year Design Flow(Q): 1.09 CFS <br /> Bottom Width(W): 2 feet -111± <br /> Avg. Side Slope(X): 3 horiz./vert. X <br /> Depth of Channel (Y): 1 feet ''!= D <br /> Retardance Class: D -� iii ' <br /> Manning's Number(N): 0.05 =n-_ _ _._ - - <br /> ii� !i� iii ii►� '- <br /> The channel will behave as follows: W <br /> Hydraulic Radius(R): 0.12 feet <br /> Depth (D): 0.14 feet Diagram 1 <br /> Velocity(V): 3.20 feet/second <br /> 10 Year Peak Flow Rate: <br /> Using the Rational Method: <br /> Qio=CIA= 0.28 6 0.65 = 1.09 cfs <br /> C = 0.28 Open Space, hydrologic soil group"D", Slope Range z 6%; <br /> I = 6 in/hr per Madison rainfall intensity; <br /> A= 0.65 acres; <br /> *The rational method runoff coefficients and rainfall intensity were determined using the <br /> Wisconsin Department of Transportation Facilities Development Manual Procedure 13-10-5 <br /> Figures 2 and 4. <br /> Designed By: AFF <br /> Date: 5/26/2015 <br /> Checked By: <br /> Date: <br /> Stormwater Submittal <br /> PC-03-15 <br /> 5/26/2015 Exhibit#3-1 <br />