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In an aquifer, the rate of change of total head per unit of distance of flow at a given point and in a given direction. In a stream, the slope of the hydraulic grade line.
- Browse Related Terms: 100-year floodplain, Aquifer-unconfined, Artesian water (artesian pressure), Confined aquifer, Hydraulic gradient, Impoundment (surface), Rebound (of water levels), Recharge, Sole source aquifer, Transmissivity, Unconfined aquifer