HY8:Increased Resistance in Culverts

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Increased Resistance in Box Culverts

The input variables required for this calculation are the following:

  • h/ri—Ratio of roughness element height divided by hydraulic radius taken about the top of the roughness element.
  • Height of the roughened section (h)

Increased Resistance in Circular Culverts

The input variables required for this calculation is the following:

  • L/Di — Ratio of roughness element spacing divided by the diameter of the culvert opening at the roughness element. (Range = .05 to 1.5)
  • h/Di — Ratio of roughness element height divided by the diameter of the culvert opening at the roughness element. (Range = .005 to .1).
  • Lr/Pi — Ratio of the roughness length to inside perimeter (Range = 0.0 to 1.0)
  • Diameter of roughened section (Opening, Di)


The following figure shows the flow regimes and variables for an increased resistance energy dissipator implemented in a circular culvert.

HY8fig7-6.jpg

Variables from the figure

  • L — Length from beginning of one roughness element to the beginning of the next roughness element.
  • h — height of roughness element
  • Di — diameter of roughened section (opening)