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/DI -- 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> -- 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).
* 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).
* Lr/Pi -- Ratio of the roughness length to inside perimeter (Range = 0.0 to 1.0)
* L<sub>r</sub>/P<sub>i</sub> -- Ratio of the roughness length to inside perimeter (Range = 0.0 to 1.0)
* Diameter of roughened section (Opening, Di)
* Diameter of roughened section (Opening, D<sub>i</sub>)
 




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




{{HY8Main}}
{{HY8Main}}

Revision as of 20:27, 16 December 2011

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)


v • e
HY-8
Introduction:Getting Started   •   Layout   •   Vena Contracta   •   Building a Project   •   Locate Project   •   Culvert Crossing Data   •   Run Analysis   •   Report Generation
Crossing and Culvert Data:Crossings   •   Discharge Data   •   Roadway Data   •   Tailwater Data   •   Irregular Channel   •   Culvert Data   •   Site Data   •   Culvert Invert Data   •   Embankment Toe Data
AnalysisProject Units   •   Roadway Overtopping   •   Inlet Control Computations   •   Outlet Control Computations   •   Tables and Plots
Energy DissipationScour Hole Geometry   •   Increased Resistance   •   Tumbling Flow   •   USBR Type IX Baffled Apron   •   Drop Structures   •   Stilling Basins   •   Streambed Level Structures
MethodsAquatic Organism Passage   •   Low Flow Hydraulics
TroubleshootingDifferences from DOS HY-8   •   Limitations   •   HY-8 User Manual
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