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Segment 4 is inside a corrugated metal arch culvert of width 9'-4" and height of 6'-3". See <br />design chart below from Handbook of Steel Drainage and Highway Construction <br />Products showing it can handle the design flow of 346 cfs. <br />The design assumes that the HW/D ratio is 1 and that the inlet will be mitered to conform <br />to the slope. <br />TR09, TRl1 (v1.0) 5-14 Revised 3/98, 8/02 <br />