HY8:Hook Basin

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Hook Basin

The input variables required for this calculation is the following:

  • Shape of Dissipator -- The user can select 'Warped Wingwalls' or 'Trapezoidal'. See illustrations below for examples.
  • Flare Angle (Warped Wingwalls only)-- Flare angle per side of the basin.
  • Ratio of Length to A-hooks over Total Basin Length (Warped Wingwalls only)-- Distance from culvert exit to first row of hooks (A-HOOKS) divided by the total length of the basin.
  • Ratio of Width to A-hooks over Total Basin Length (Warped Wingwalls only)-- Distance between hooks in the first row divided by the basin width at the first row.
  • Ratio of Length to B-Hooks over Total Basin Length (Warped Wingwalls only)-- Distance from culvert exit to second row of hooks (B-HOOKS) divided by the total length of the basin.
  • Width for the Downstream End of the Basin (Warped Wingwalls only)
  • Basin Side Slope (Trapezoidal shape only) -- The user can select either '1.5 : 1' or '2 : 1'.
  • Basin Bottom Width (Trapezoidal shape only)


The next two figures show a hook basin with warped wingwalls:

HY8fig9-8b&w.jpg

Variables from the figure

  • W0 -- Outlet width
  • W1 -- Width at first hooks
  • W2 -- Distance between first hooks (row A)
  • W3 -- lateral spacing between A and B hook
  • W4 -- Width of hooks
  • W5 -- Width of slot in end sill
  • W6 -- approximately channel width
  • h4 -- Height of end sill
  • h5 -- Height to top of end sill
  • h6 -- Height to top of warped wingwall
  • ye -- Equivalent depth
  • L1 -- Distance to first hooks
  • L2 -- Distance to second hooks (row B)
  • LB -- Basin length

HY8fig9-8hook (rev).jpg

Variables from the figure

  • ß -- Angle of radius
  • r -- radius
  • h1 -- height to center of radius
  • h2 -- Height to point
  • h3 -- Height to top of radius
  • ye -- Equivalent depth


The next two figures show a hook basin with a uniform uniform trapezoidal channel:

HY8fig9-12hooktrap-hor (rev).jpg

Variables from the figure

  • W0 -- Outlet width
  • W1 -- Width at first hooks
  • W2 -- Distance between first hooks (row A)
  • W3 -- lateral spacing between A and B hook
  • W4 -- Width of hooks
  • W5 -- Width of slot in end sill
  • WB -- approximately channel width
  • h4 -- Height of end sill
  • h5 -- Height to top of end sill
  • h6 -- Height to top of warped wingwall
  • ye -- Equivalent depth
  • L1 -- Distance to first hooks
  • L2 -- Distance to second hooks (row B)
  • LB -- Basin length

HY8fig9-11 hook trap (rev).jpg

Variables from the figure

  • ß -- Angle of radius
  • r -- radius
  • h1 -- height to center of radius
  • h2 -- Height to point
  • h3 -- Height to top of radius


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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