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Ditch J -11 Optional <br />Channel Lining <br />Flow In a 30" Half Culvert <br />The design for ditch J -11 is a trapezoidal channel, 3' bottom width, 1.5H:1 V side slopes, <br />1.3 feet deep which includes 1.0 feet of freeboard and 12" riprap. An optional ditch <br />design is the installation of a half culvert to convey the 11.0 cfs design flow. A 1/2 30" <br />CMP, 8% slope will carry the design flow with a depth of 0.8 feet. Allowing 0.3 feet of <br />freeboard brings the design depth to 1.1 feet. Actual freeboard is 0.45 feet. <br />fA <br />lk o i`f W1 <br />IL <br />TR -91 Volume XI App. B -63i 09/14 <br />