#tide  the periodic rise and fall of the sea level under the gravitational pull of the moon
  supertype:  periodic_event__recurrent_event__recurrentevent  an event that recurs at intervals
  part:  tidal_flow  riptide  undertide
  subtype:  high_tide__high_water__highwater  the tide when the water is highest
     subtype:  direct_tide  the occurrence of high tide on one side of the earth coinciding with high tide on the opposite side
     subtype:  neap_tide__neap  a less than average tide occurring at the first and third quarters of the moon
     subtype:  springtide  a greater than average tide occurring during the new and full moons
  subtype:  low_tide__lowtide__low_water__lowwater  the lowest (farthest) ebb of the tide
  subtype:  ebbtide  the tide while water is flowing out
  subtype:  rising_tide__flood_tide__floodtide  the occurrence of incoming water (between a low tide and the following high tide)
  subtype:  slack_water__slack_tide__slacktide  the occurrence of relatively still water at the turn of the (low) tide

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