Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by function]
8. hydraulic structures
9. [hydraulic structures by function]
10. erosion protection works

Anotations

Scope note:

Structures extending from the shore into a body of water and built to influence current or protect the entrance to a harbor or river from shoaling. For similar structures built to control or direct seashore erosions, use "groins (erosion protection works)"; use "wing dams" when such erosion control structures occur along banks of rivers or streams.