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. water distribution structures
11. water treatment plants

Narrower term/s

• settling tanks

Anotations

Scope note:

Facilities for receiving waste, usually raw sewage, from surrounding homes and businesses for the purpose of removing contaminants and other materials that could damage water quality and the environment.