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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]] | |
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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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