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Hydraulic conductivity - The rate of flow of a unit volume of water a prevailing density and viscosity passes through one square unit of porous medium under a unit hydraulic gradient (meters/second).
Hydraulic Gradient - In an aquifer, the rate of change of total head per unit distance of flow at a given location and direction. It has both horizontal and vertical components.
Hydrogeological unit - A volume of rock or sediment which has similar hydraulic properties for groundwater flow.
Hydrogeology - The science that relates geology, fluid movement (i.e. water) and geochemistry to understand water residing under the earth’s surface. Groundwater as used here includes all water in the zone of saturation beneath the earth’s surface, except water chemically combined in minerals.