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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).
Definition - What does Aquifer mean? An aquifer is an underground layer of water-bearing permeable rock or unconsolidated materials from which groundwater can be extracted using water wells. Aquifers occur at various depths. Those closer to the surface are more likely to be used for water supply and irrigation. They are also likely to be topped off by local rainfall.