# Difference between revisions of "HY8:Hook Basin"

### 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:

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

Variables from the figure

• ß — Angle of 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:

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

Variables from the figure

• ß — Angle of radius