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 form]
10. artificial water channels
11. sluices

Anotations

Scope note:

Subsidiary built waterways for redirecting the water of a river or canal, provided with an adjustable gate or gates by which the volume of water is regulated or controlled. These are commonly used for low discharges; use "sluices" for structures that regulate higher discharges of water.