Determination of Single Barrel Box Culvert Inlet Loss Coefficients
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Determination of Single Barrel Box Culvert Inlet Loss Coefficients

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Details:

  • Creators:
    Graziano, Frank
  • Corporate Creators:
    GKY and Associates
  • Corporate Contributors:
    South Dakota. Department of Transportation. Office of Research
  • Subject/TRT Terms:
  • Publication/ Report Number:
    SD93-12-F
  • Resource Type:
    Tech Report
  • Geographical Coverage:
  • Edition:
    Final Report May 1993 to February 1996
  • Corporate Publisher:
    South Dakota. Department of Transportation. Office of Research
  • 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, but use of precast box culverts is becoming a viable option. With cast-in-place box culverts, beveled inlet edges and 30° flared wingwalls are used at the inlet because that is usually the most efficient inlet shape. When precast box culverts are used, the inlet ends available from the South Dakota precast industry are mitered end with 0° flared wingwalls which have a standard four inch (regardless of barrel size) beveled edge along the bottom of the top edge of the inlet opening and along the top inside edge of the wingwalls. Current design methods, such as computer program HY8, do not provide for this mitered inlet option because, to our knowledge, model testing has not been conducted for this configuration. The Turner-Fairbank Highway Research Center agreed to determine inlet loss coefficients for certain inlet types used by SDDOT. The initial models were built and hydraulics testing performed as a graduate research fellowship project. Unfortunately, the models were not properly constructed and did not conform to the plans. As a result, the inlet loss coefficients determined by testing were not valid. After the research panel pointed this out, the research center agreed to accurately reconstruct the models and perform the tests again. The Research Center contracted with GKY & Associates, Inc., who took over the study and completed it in four months.
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