#canal  long and narrow strip of water made for boats or for irrigation
  supertype:  #conduit__channel  a passage for water (or other fluids)
  subtype:  #cut.canal  #industrial_watercourse  #raceway  #ship_canal
  instance:  #Erie_Canal  #New_York_State_Barge_Canal
  part:  #lock_chamber__lock  enclosure consisting of a section of canal that can be closed to control the water level; used to raise or lower vessels that pass through it
  part:  #lockage.system  a system of locks in a canal or waterway

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