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Etymology edit

hydro- +‎ -graph

Noun edit

hydrograph (plural hydrographs)

  1. A graph of flow past a point in a river versus time.
  2. A graph of water table versus time.
    • 1962, Arthur John Zeizel, Ground-water resources of Du Page County, Illinois:
      A comparison of Silurian dolomite aquifer water-level hydrographs and pumpage graphs indicates that in general water-level decline is directly proportional to pumpage and suggests that recharge balances discharge.

Translations edit