hydraulic gradient

   1. The change in static head per unit of distance in a given direction. If not specified, the direction generally is understood to be that of the maximum rate of decrease in head [22].
   2. Slope of the water table or potentiometric surface [22].
   3. A chance in the static pressure of ground water expressed in terms of the height of water above a datum, per unit of distance in a given direction [22].

A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. . 2002.

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