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:

Impermeable, rigid barriers built out from a bank of a river or stream diverting the current to prevent or encourage scour. For similar structures located at the seashore, use "groins (erosion protection works)"; when such structures are built to control shoaling, use "jetties (erosion protection works)."