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Definition of Hydraulic gradient

Hydraulic gradient Definition from Society & Culture Dictionaries & Glossaries
EPA Terms of Environment
In general, the direction of groundwater flow due to changes in the depth of the water table.
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering (English ver.)
Slope defined by the change in hydrostatic levels in a given aquifer over a given distance.
The gradient or slope of a water table or Piezometric Surface in the direction of the greatest slope, generally expressed in feet per mile or feet per feet. Specifically, the change in static head per unit of distance in a given direction, generally the direction of the maximum rate of decrease in head. The difference in hydraulic heads (h1 - h2), divided by the distance (L) along the flowpath, or, expressed in percentage terms: I = (h1 - h2) / L X 100 I = (h1 - h2) / L X 100; A hydraulic gradient of 100 percent means a one foot drop in head in one foot of flow distance.