#reservoir  tank used for collecting and storing a liquid (as water or oil)
  supertype:  storage_tank__storagetank__tank  a large (usually metallic) vessel for holding gases or liquids
  subtype:  cistern  an artificial reservoir for storing liquids; especially an underground tank for storing rainwater
     subtype:  cesspool__cesspit__sump  a covered cistern; waste water and sewage flow into it
     subtype:  rain_barrel  a barrel used as a cistern to hold rainwater
  subtype:  sump.reservoir  an oil reservoir in an internal combustion engine
  subtype:  water_tower__watertower  a large reservoir for water

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