Hydraulic Design of Highway Culverts - DOT On-Line Publications

Example Problem #1 (SI Units)
A culvert at a new roadway crossing must be designed to pass the 25-year flood. Hydrologic
analysis indicates a peak flow rate of 5.663 m³/s. Use the following site information:
Elevation at Culvert Face: 30.480 m
Natural Stream Bed Slope: 1 percent = 0.01 m/m
Tailwater for 25-Year Flood: 1.067 m
Approximate Culvert Length: 60.960 m
Shoulder Elevation: 33.528m
Design a circular pipe culvert for this site. Consider the use of a corrugated metal pipe with
standard 68 x 13 mm in corrugations and beveled edges and concrete pipe with a groove end.
Base the design headwater on the shoulder elevation with a 0.61 m freeboard (elevation 32.918
m). Set the inlet invert at the natural streambed elevation (no FALL).
Note: Design charts used in this example are reproduced on the following pages.
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