# HY8:Hook Basin

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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

- W
_{0}— Outlet width - W
_{1}— Width at first hooks - W
_{2}— Distance between first hooks (row A) - W
_{3}— lateral spacing between A and B hook - W
_{4}— Width of hooks - W
_{5}— Width of slot in end sill - W
_{6}— approximately channel width - h
_{4}— Height of end sill - h
_{5}— Height to top of end sill - h
_{6}— Height to top of warped wingwall - y
_{e}— Equivalent depth - L
_{1}— Distance to first hooks - L
_{2}— Distance to second hooks (row B) - L
_{B}— Basin length

Variables from the figure

- ß — Angle of radius
- r — radius
- h
_{1}— height to center of radius - h
_{2}— Height to point - h
_{3}— Height to top of radius - y
_{e}— Equivalent depth

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

Variables from the figure

- W
_{0}— Outlet width - W
_{1}— Width at first hooks - W
_{2}— Distance between first hooks (row A) - W
_{3}— lateral spacing between A and B hook - W
_{4}— Width of hooks - W
_{5}— Width of slot in end sill - W
_{B}— approximately channel width - h
_{4}— Height of end sill - h
_{5}— Height to top of end sill - h
_{6}— Height to top of warped wingwall - y
_{e}— Equivalent depth - L
_{1}— Distance to first hooks - L
_{2}— Distance to second hooks (row B) - L
_{B}— Basin length

Variables from the figure

- ß — Angle of radius
- r — radius
- h
_{1}— height to center of radius - h
_{2}— Height to point - h
_{3}— Height to top of radius