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Ditch Factor North Ditch <br /> Q 2.6 cfs <br /> Z 2:1 <br /> Shape V-ditch <br /> "Alternate A" <br /> n (without riprap) 0.025 <br /> do 0.64 ft. <br /> Sc 1.5% <br /> Vc 3.20 fps <br /> "Alternative B" <br /> n (with riprap) 0.04 <br /> Based on the above results, the East Ditch will be constructed with the <br /> following minimum dimensions. <br /> "Alternate A" (without riprap) : <br /> Minimum depth = 2 ft. <br /> Side Slopes = 2:1 <br /> Slope = 0% to 1.5% <br /> Maximum Velocity = 3.20 fps <br /> Q = 2.6 cfs <br /> Manning's N = 0.025 <br /> Shape = V-ditch <br /> "Alternate B" (with riprap) : <br /> Minimum depth = 2 ft. <br /> Side Slopes = 2:1 <br /> Ditch Slope = 1.5% to 50% <br /> Maximum Velocity = 8.23 fps <br /> Q = 2.6 cfs <br /> Manning' s N = 0.04 <br /> Shape = V-ditch <br /> 12 <br />