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]

Narrower term/s

• [hydraulic structures by form][+]
  • artificial water channels [+]
    • canals (waterways) [+]
      • interoceanic canals
      • abandoned canals [NP]
      • sections of canals
    • flumes
    • millraces [+]
      • tailraces
    • sluices [+]
      • outlet sluices
    • distributaries (streams) [NP]
    • watercourses [NP] [+]
      • intermittent watercourses
      • sections of watercourses
      • tidal watercourses
      • abandoned watercourses (geographic features)
      • lost watercourses
    • underground irrigation canals
    • drainage ditches
    • irrigation ditches
  • locks (hydraulic structures)
  • control locks
• [hydraulic structures by function][+]
  • dams (hydraulic structures) [+]
    • [dams by form] [+]
      • arch dams
      • buttress dams
      • gravity dams
    • [dams by function] [+]
      • cofferdams
      • barrages (dams)
      • check dams
      • diversion dams
      • flood dams
      • hydroelectric dams
      • weirs [+]
      • off-bankline revetments
    • [dams by construction] [+]
      • earth dams [+]
      • rock-fill dams
  • erosion protection works [+]
    • breakwaters [+]
      • blockwork breakwaters
      • mound breakwaters
      • seawalls
      • moles (structures) [NP]
    • gabions
    • groins (erosion protection works)
    • wing dams
    • hydraulic gates
    • jetties (erosion protection works)
    • riprap
  • flood protection works [+]
    • levees
    • dikes [+]
      • peat dikes
      • polder dikes
      • defensive dikes [NP]
    • doorlaatbrugs
  • land reclamation works
  • water distribution structures [+]
    • aqueducts [+]
      • qanats
    • settling basins
    • storm water retention basins
    • conduits (water distribution structures)
    • fountains [+]
      • ablution fountains [NP]
      • sabils
    • pumping stations
    • reservoirs (water distribution structures) [+]
      • castelli aquae
      • underground reservoirs
      • water towers [+]
      • artificial lakes
      • āb-anbārs
      • former reservoirs
      • vapis
      • birkats
      • tals (reservoirs)
    • standpipes (plumbing)
    • water tanks [+]
      • cisterns (plumbing components) [NP]
      • sacred tanks [+]
    • artesian wells [NP]
    • stepwells [NP]
    • waterworks [NP]
    • water treatment plants [+]
      • sewage treatment plants [+]
      • desalination plants
      • filtration plants
    • water tunnels [NP]
    • fountain-houses
    • water wells [NP]
    • praṇāla
    • ambumārga
  • drainage structures [+]
    • culverts
    • sewers (drainage structures) [+]
      • [sewers by location or context] [+]
      • [sewers by function] [+]
  • stream gauging stations

Anotations

Scope note:

Facilities designed to convey or control the flow of water, including channels, bridges, dams, and other such constructions.