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| The only input variable required for this calculation is the following:
| | #redirect [[HY8:Tumbling_Flow#Tumbling_Flow_in_Circular_Culverts]] |
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| * Diameter of enlarged culvert
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| The following figures show implementations of tumbling flow within circular culverts along with the variables used to design the energy dissipator.
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| [[Image:HY8fig7-1.jpg]]
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| Variables from the figure
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| * D — Diameter of original culvert
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| * V<sub>n</sub> — Tailwater velocity
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| * y<sub>n</sub> — Tailwater depth
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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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| * h<sub>1</sub> — length from top of roughness element to enlarged culvert ceiling
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| * h<sub>2</sub> — height of splash shield on enlarged culvert ceiling.
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| * h<sub>3</sub> — rise of enlarged culvert.
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| [[Image:HY8fig7-4.jpg]]
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| Variables from the figure
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| * D — Diameter of original culvert
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| * D<sub>1</sub> — Diameter of enlarged culvert
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| * D<sub>i</sub> — Diameter of roughened section
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| * h — Height of roughness element
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| * L — Length from beginning of one roughness element to the beginning of the next roughness element.
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| [[Image:HY8image6.jpg|300 px]]
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| Variables from the figure
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| * D — Diameter of original culvert
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| * T — Water surface width at critical flow condition
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| * y — Depth of flow
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| {{HY8Main}}
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| [[Category:Energy Dissipators|T]] | |
