HY8:Increased Resistance in Circular Culverts: Difference between revisions

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The input variables required for this calculation is the following:
The input variables required for this calculation is the following:


* L/D<sub>i</sub> -- Ratio of roughness element spacing divided by the diameter of the culvert opening at the roughness element. (Range = .05 to 1.5)
* L/D<sub>i</sub> &mdash; Ratio of roughness element spacing divided by the diameter of the culvert opening at the roughness element. (Range = .05 to 1.5)
* h/D<sub>i</sub> -- Ratio of roughness element height divided by the diameter of the culvert opening at the roughness element. (Range = .005 to .1).
* h/D<sub>i</sub> &mdash; Ratio of roughness element height divided by the diameter of the culvert opening at the roughness element. (Range = .005 to .1).
* L<sub>r</sub>/P<sub>i</sub> -- Ratio of the roughness length to inside perimeter (Range = 0.0 to 1.0)
* L<sub>r</sub>/P<sub>i</sub> &mdash; Ratio of the roughness length to inside perimeter (Range = 0.0 to 1.0)
* Diameter of roughened section (Opening, D<sub>i</sub>)
* Diameter of roughened section (Opening, D<sub>i</sub>)


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Variables from the figure
Variables from the figure


* L -- Length from beginning of one roughness element  to the beginning of the next roughness element.
* L &mdash; Length from beginning of one roughness element  to the beginning of the next roughness element.
* h -- height of roughness element
* h &mdash; height of roughness element
* D<sub>i</sub> -- diameter of roughened section (opening)
* D<sub>i</sub> &mdash; diameter of roughened section (opening)




{{HY8Main}}
{{HY8Main}}

Revision as of 00:10, 10 January 2013

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)