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OPEN CHANNEL FLOW <br /> VELOCITY / DEPTH CALCULATION <br /> (Using Chezy-Manning Equation) <br /> PROJECT: 2766 TOWER ROAD ADDITION <br /> FILE NUMBER: JM-11-14 <br /> LOCATION: West Swale <br /> Enter the channel characteristics (see Diagram 1): <br /> CHANNEL CROSS SECTION <br /> Minimum Channel Slope (S): 0.013 feet/feet <br /> *100 Year Design Flow(Q): 0.40 CFS <br /> Bottom Width (W): 4 feet <br /> Avg. Side Slope (X): 4 horiz./vert. X <br /> Depth of Channel (Y): 1 feet D 1 <br /> Retardance Class: D <br /> Manning's Number(N): 0.04 <br /> ar <br /> The channel will behave as follows: fW� <br /> Hydraulic Radius (R): 0.09 feet <br /> Depth (D): 0.10 feet Diagram 1 <br /> Velocity(V): 0.86 feet/second <br /> 100 Year Peak Flow Rate: <br /> Using the Rational Method: <br /> Qioo =CIA: 0.49 8.1 0.10 = 0.40 cfs <br /> C = 0.49 Medium Residential, 30% impervious, HSG C, 6% and Greater <br /> I = 8.1 in/hr per Madison rainfall intensity; <br /> A = 0.10 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 /> Attachments 5.2 and 5.4. <br /> Designed By: RR <br /> Date: 1/6/2015 <br /> Checked By: <br /> Date: <br /> Shoreland Erosion Control <br /> JM-11-14 <br /> 1/12/2015 Exhibit #6 <br />