#dike__dam__dyke__levee  a barrier constructed to contain the flow or water or to keep out the sea
  supertype:  #barrier  a structure or object that impedes free movement
  subtype:  #Aswan_High_Dam__Aswan_Dam__High_Dam  one of the world's largest dams on the Nile River in southern Egypt
  subtype:  #Hoover_Dam  a large dam on the Colorado River in Nevada
  subtype:  #milldam  dam to make a millpond to provide power for a water mill
  subtype:  #weir  a low dam built across a stream to raise its level or divert its flow

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