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calculations for the ditch, a ditch section will be constructed with riprap or without <br /> riprap, depending on whether the ditch's slope is steeper or flatter than critical slope. <br /> Each ditch will have a minimum of one foot of freeboard included in the total depth. This <br /> will allow the ditch to be field located as close as practical to the proposed disturbance <br /> area but still control all runoff and direct the flow to Pond 007 (see Exhibit 13-5). <br /> Following is a summary of "Alternative A" and "Alternative B" ditch design to be used for <br /> the East Ditch. <br /> Ditch Factor East Ditch <br /> Q 67.1 cfs <br /> Z 3:1 <br /> Shape V-ditch <br /> "Alternative All n (Without Riprap) 0.03 <br /> do 2.0 <br /> Sc 1.4% <br /> Vc 5.66 fps <br /> "Alternative B" n (With Riprap) 0.04 <br /> Based on the above results, the East Ditch will be constructed with the following minimum <br /> dimensions: <br /> "Alternative All (Without Riprap): <br /> Minimum Depth = 3.5 ft. <br /> Side Slopes = 3:1 <br /> Slope = 0.5% to 1.4% <br /> Maximum Velocity = 5.66 fps <br /> Q = 67.1 cfs <br /> n = 0.03 <br /> Shape = V-ditch <br /> 13 Revised 08/19/88 <br />