HY8:Riprap Basin and Apron: Difference between revisions
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===Riprap Basin and Apron=== | ===Riprap Basin and Apron=== | ||
The input variables required for this calculation is the following: | The input variables required for this calculation is the following: | ||
* Condition to compute Basin Outlet Velocity — The user can select ''Best Fit Curve'' or ''Envelope Curve''. The user should choose ''Best Fit Curve'' if the flow downstream of the basin is believed to be supercritical. If the flow downstream is believed to be subcritical, the user should choose ''Envelope Curve''. | |||
* Condition to compute Basin Outlet Velocity | * D50 of the Riprap Mixture — Mean diameter (by weight) of the riprap to be used. | ||
* D50 of the Riprap Mixture | * DMax of the Riprap Mixture — Maximum diameter (by weight) of the riprap to be used. | ||
* DMax of the Riprap Mixture | |||
The design criteria for this basin was based on model runs in which D50/YE ranged from 0.1 to 0.7; values outside this range are rejected by the program. | The design criteria for this basin was based on model runs in which D50/YE ranged from 0.1 to 0.7; values outside this range are rejected by the program. | ||
The following figures show riprap basins and aprons. | The following figures show riprap basins and aprons. | ||
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Variables from the figure | Variables from the figure | ||
* h<sub>S</sub> — Dissipator pool depth | |||
* h<sub>S</sub> | * W<sub>0</sub> — Culvert width | ||
* W<sub>0</sub> | * TW — Tailwater depth | ||
* TW | * y<sub>e</sub> — Equivalent brink (outlet) depth | ||
* y<sub>e</sub> | * d<sub>50</sub> — Median rock size by weight | ||
* d<sub>50</sub> | * d<sub>max</sub> — Max rock size by weight | ||
* d<sub>max</sub> | |||
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{{HY8Main}} | {{HY8Main}} | ||
[[Category:Energy Dissipators|R]] | |||
Latest revision as of 14:36, 11 October 2016
Riprap Basin and Apron
The input variables required for this calculation is the following:
- Condition to compute Basin Outlet Velocity — The user can select Best Fit Curve or Envelope Curve. The user should choose Best Fit Curve if the flow downstream of the basin is believed to be supercritical. If the flow downstream is believed to be subcritical, the user should choose Envelope Curve.
- D50 of the Riprap Mixture — Mean diameter (by weight) of the riprap to be used.
- DMax of the Riprap Mixture — Maximum diameter (by weight) of the riprap to be used.
The design criteria for this basin was based on model runs in which D50/YE ranged from 0.1 to 0.7; values outside this range are rejected by the program.
The following figures show riprap basins and aprons.
Variables from the figure
- hS — Dissipator pool depth
- W0 — Culvert width
- TW — Tailwater depth
- ye — Equivalent brink (outlet) depth
- d50 — Median rock size by weight
- dmax — Max rock size by weight
