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:


HY8fig98.png


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


HY8fig98Hook.png


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:


HY8fig912HookTrapHor.png


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


HY8fig911HookTrap.png


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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