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An aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to rise and fall.
- 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