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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 B <br /> Enter the channel characteristics(see Diagram 1): <br /> CHANNEL CROSS SECTION <br /> Minimum Channel Slope(S): 0.01 feet/feet <br /> 10 Year Design Flow(Q): 0.46 CFS i1 1 <br /> Bottom Width(W): 2 feet <br /> Avg. Side Slope(X): 3 horiz./vert. '!I=, X -i <br /> Depth of Channel(Y): 0.75 feet 7E1 O _.1, --7=1- <br /> lY <br /> Retardance Class: D <br /> = <br /> Manning's Number(N): 0.054i <br /> - ,� <br /> Ii 11 =iii 70 <br /> -I I-iTI =1 <br /> The channel will behave as follows: W <br /> Hydraulic Radius (R): 0.16 feet <br /> Depth (D): 0.20 feet Diagram 1 <br /> Velocity(V): 0.88 feet/second <br /> 10 Year Peak Flow Rate: <br /> Using the Rational Method: <br /> Qio=CIA= 0.51 6 0.15 = 0.46 cfs <br /> C = 0.51 Weighted Avg. (Open Space& Roof), HSG "D", Slope Range 0-2%; <br /> I = 6 in/hr per Madison rainfall intensity; <br /> A= 0.15 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#3-3 <br />