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• <br />Culvert Design <br /> <br />Culvert No. Design Flow <br />cfs Culvert Diameter <br />(inches) Head <br />(ft) <br />C-1 18.4 24 3.1 <br />C-2 28.8 24 5.4 <br />C-3 3.2 24 <0.5 <br />• Design from U.S. Bureau of Public Roads Nomograph for projecting inlet. <br /> <br />-21- <br /> <br />