HY8:Box Inlet Drop Structure: 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:


* HD -- Desired drop height. Must be between 2 and 12 ft or between 0.6 and 3.7 m.
* H<sub>D</sub> -- Desired drop height. Must be between 2 and 12 ft or between 0.6 and 3.7 m.
* New Slope  -- The slope that will exist on the channel once the drop structures are in place (The new slope must be subcritical).
* New Slope  -- The slope that will exist on the channel once the drop structures are in place (The new slope must be subcritical).
* Box Length -- Length of box inlet. (USER'S CHOICE)
* Box Length -- Length of box inlet. (USER'S CHOICE)
* W2 -- Width of box inlet.  Must fit criteria (.25 < HD/W2 < 1)
* W<sub>2</sub> -- Width of box inlet.  Must fit criteria (.25 < H<sub>D</sub>/W<sub>2</sub> < 1)
* W3 -- Width of the Downstream End of Stilling Basin. This must be equal to or larger than the culvert width.  
* W<sub>3</sub> -- Width of the Downstream End of Stilling Basin. This must be equal to or larger than the culvert width.  


Flare of Stilling Basin (1 Lateral: Z long) -- This value must be greater than or equal to 2, which is to say 1 lateral: 2 Long)
Flare of Stilling Basin (1 Lateral: Z long) -- This value must be greater than or equal to 2, which is to say 1 lateral: 2 Long)
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Length from Toe of Dike to Box Inlet -- If a dike is used, the distance from the toe of the dike to the box inlet must be entered.  If no dike is used, enter a value of 100 ft or 30.48 m for this distance.
Length from Toe of Dike to Box Inlet -- If a dike is used, the distance from the toe of the dike to the box inlet must be entered.  If no dike is used, enter a value of 100 ft or 30.48 m for this distance.




The following figure shows a plan and side view of a box inlet drop structure.
The following figure shows a plan and side view of a box inlet drop structure.
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Variables from the figure
Variables from the figure


* W1 -- Width of the upstream end of the basin
* W<sub>1</sub> -- Width of the upstream end of the basin
* W2 --  Width of box inlet crest
* W<sub>2</sub> --  Width of box inlet crest
* W3 --  Width of the downstream end of the basin
* W<sub>3</sub> --  Width of the downstream end of the basin
* W4 -- Distance from the toe of dike to the box inlet
* W<sub>4</sub> -- Distance from the toe of dike to the box inlet
* L1 -- Length of box inlet
* L<sub>1</sub> -- Length of box inlet
* L2 -- Minimum length for the straight section
* L<sub>2</sub> -- Minimum length for the straight section
* L3 -- Minimum length for final section (potentially flared)
* L<sub>3</sub> -- Minimum length for final section (potentially flared)
* H0 -- Drop from crest to stilling basin floor
* H<sub>0</sub> -- Drop from crest to stilling basin floor
* h2 -- Vertical distance of the tailwater below the crest
* h<sub>2</sub> -- Vertical distance of the tailwater below the crest
* h3 -- Height of the end sill
* h<sub>3</sub> -- Height of the end sill
* y0 -- Required head on the weir crest to pass the design flow
* y<sub>0</sub> -- Required head on the weir crest to pass the design flow
* y3 -- Tailwater depth above the floor of the stilling basin
* y<sub>3</sub> -- Tailwater depth above the floor of the stilling basin
* h4 -- Sill height
* h<sub>4</sub> -- Sill height
 




{{HY8Main}}
{{HY8Main}}

Revision as of 21:14, 16 December 2011

The input variables required for this calculation is the following:

  • HD -- Desired drop height. Must be between 2 and 12 ft or between 0.6 and 3.7 m.
  • New Slope -- The slope that will exist on the channel once the drop structures are in place (The new slope must be subcritical).
  • Box Length -- Length of box inlet. (USER'S CHOICE)
  • W2 -- Width of box inlet. Must fit criteria (.25 < HD/W2 < 1)
  • W3 -- Width of the Downstream End of Stilling Basin. This must be equal to or larger than the culvert width.

Flare of Stilling Basin (1 Lateral: Z long) -- This value must be greater than or equal to 2, which is to say 1 lateral: 2 Long)

Length from Toe of Dike to Box Inlet -- If a dike is used, the distance from the toe of the dike to the box inlet must be entered. If no dike is used, enter a value of 100 ft or 30.48 m for this distance.


The following figure shows a plan and side view of a box inlet drop structure.

HY8fig11-4 (box drop).jpg

Variables from the figure

  • W1 -- Width of the upstream end of the basin
  • W2 -- Width of box inlet crest
  • W3 -- Width of the downstream end of the basin
  • W4 -- Distance from the toe of dike to the box inlet
  • L1 -- Length of box inlet
  • L2 -- Minimum length for the straight section
  • L3 -- Minimum length for final section (potentially flared)
  • H0 -- Drop from crest to stilling basin floor
  • h2 -- Vertical distance of the tailwater below the crest
  • h3 -- Height of the end sill
  • y0 -- Required head on the weir crest to pass the design flow
  • y3 -- Tailwater depth above the floor of the stilling basin
  • h4 -- Sill height


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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