Bend losses in rectangular culverts.
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Bend losses in rectangular culverts.

  • Published Date:

    2008-09-01

  • Language:
    English
Filetype[PDF-1.14 MB]


Details:
  • Resource Type:
  • Geographical Coverage:
  • TRIS Online Accession Number:
    1115373
  • OCLC Number:
    263871919
  • Edition:
    Final report
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Design ; NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance ; NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ;
  • Abstract:
    This study investigated bend losses for open channel flow in rectangular channels or culverts. Laboratory experiments were performed for sub-critical flow in rectangular channels with abrupt bends. Bend angles of approximately 30, 45, 60, 75 and 90 degrees were tested. The experimental results were expressed as empirical equations, charts and tables relating the bend loss coefficient to the bend angle. The velocity and depth are at a location sufficiently downstream from the bend to allow the flow to return to gradually varied. A procedure was developed to estimate head loss for gradual bends in rectangular channels flowing as free surface flow. The bend loss coefficients for gradual bends in conduits flowing full were used to develop an adjustment factor. This factor was used to estimate a gradual bend loss coefficient for free surface flow in rectangular channels. The equation used to estimate the gradual bend loss coefficient was where is the abrupt bend loss coefficient, as defined in this study. Example problems were presented illustrating the computation of bend loss for both an abrupt bend and a gradual bend in a rectangular open channel.
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