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• <br />�J <br />• <br />CULVERT AND DITCH SPECIFICATION SUMMARY <br />MINIMUM SIZE TO HANDLE DESIGN FLOW <br />Item <br />Material <br />Size <br />Culvert <br />1 <br />ADS <br />12" Diameter <br />2 <br />CMP <br />18" Diameter <br />3 <br />CMP /Steel <br />8" Diameter* <br />4 <br />ADS /CMP <br />24" Diameter <br />5 <br />CMP <br />18" Diameter <br />Ditch <br />A <br />Earth <br />Trapezoidal Channel <br />1'- Bottom Width <br />1.5' Deep with freeboard <br />2h:ly Side Slopes <br />Ditch <br />B <br />Earth <br />Triangular Channel V -Ditch <br />1.4' Deep with freeboard <br />2h:ly Side Slopes <br />Mine Bench <br />Earth <br />Triangular Channel V -Ditch <br />Access <br />Road <br />1.2' Deep with freeboard <br />Segment <br />1 & <br />Segment 2 <br />1.5h:ly Side Slopes <br />ADS = Advanced Drainage Systems "Plastic" Corrugated Pipe <br />CMP = Corrugated Metal Pipe <br />* By the end of April 1994, Culvert 3 will be replaced by a <br />12 -inch diameter steel or cmp pipe. <br />11 -8 <br />Rev. 02 -15 -94 <br />