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:

Baskets or cages filled with earth or rocks and used generally for support or abutment, especially for erosion protection; may also be used for military works, flood control, harbor works, dams, and foundations.