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| The input variables required for this calculation is the following:
| | #redirect [[HY8:Increased_Resistance_in_Culverts#Increased_Resistance_in_Circular_Culverts]] |
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| * 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)
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| * 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).
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| * L<sub>r</sub>/P<sub>i</sub> — Ratio of the roughness length to inside perimeter (Range = 0.0 to 1.0)
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| * Diameter of roughened section (Opening, D<sub>i</sub>)
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| The following figure shows the flow regimes and variables for an increased resistance energy dissipator implemented in a circular culvert.
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| [[Image:HY8fig7-6.jpg]] | |
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| Variables from the figure
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| * L — Length from beginning of one roughness element to the beginning of the next roughness element.
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| * h — height of roughness element
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| * D<sub>i</sub> — diameter of roughened section (opening)
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| {{HY8Main}}
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