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. dams (hydraulic structures)
11. [dams by construction]
12. earth dams

Anotations

Scope note:

Earth dams, usually relatively small in size, constructed of a single kind and consistency of material, often a sandy clay, to form an impervious foundation with relatively flat side slopes to ensure stability.