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A perched water table (or perched aquifer) is an aquifer that occurs above the regional water table, in the vadose zone. 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 surface of the land.he water table is the surface where the water pressure head is equal to the atmospheric pressure (where gauge pressure = 0).
Corrosionpedia explains Aquifer. An aquifer is an underground layer of water-bearing permeable rock or unconsolidated materials (gravel, sand or silt) from which groundwater can be extracted using a water well. Unconfined aquifers are those into which water seeps in from the ground surface directly above the aquifer.