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Water table
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=== Perched water tables === A perched water table (or perched aquifer) is an aquifer that occurs above the regional water table. This occurs when there is an impermeable layer of rock or sediment ([[aquiclude]]) or relatively impermeable layer ([[aquitard]]) above the main water table/aquifer but below the land surface. If a perched aquifer's flow intersects the surface, at a valley wall, for example, the water is discharged as a [[spring (hydrosphere)|spring]].
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