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. transportation structures
9. [transportation structures by function]
10. water transportation structures

Anotations

Scope note:

Enclosures or narrow, artificial basins that hold single ships, boats, or other watercraft, and from which the water may be pumped or let out to leave the vessel dry for the purpose of maintenance, repair, or shipbuilding. (Sometimes also used for building ships.). Dry docks are known in the historical record as early as the 10th century in China.