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Publication Number: FHWA-RD-01-076
Date: June 2001

South Dakota Culvert Inlet Design Coeffecients

Cover of Report Publication: South Dakota Culvert Inlet Design Coefficients PDF (pdf - 1.6 mb)
FHWA-RD-01-076, June 2001

Abstract: Each year, the South Dakota Department of Transportation builds a number of box culverts through its highway construction program. In the past, cast-in-place box culverts were used exclusively; however, use of precast box culverts is becoming a viable option. The cast-in-place culverts feature 30-degree flared wingwalls and a beveled top edge. The precast culverts have a 0-degree flare and a constant 4-in (101.6-mm) bevel (regardless of barrel size) along the top of the wingwalls and the top edge of the culvert entrance.

This report summarizes model testing performed on the above culvert shapes for the purpose of developing design coefficients for both inlet and outlet control. The most efficient configuration tested was the model of the cast-in-place box culvert.


The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT).
The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). The hydraulics and hydrology research program at the TFHRC Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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United States Department of Transportation - Federal Highway Administration