what is a water table aquifer
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).
Below the water table, in the phreatic zone, permeable units that yield groundwater are called aquifers. The ability of the aquifer to store groundwater is dependent on the primary and secondary porosity and permeability of the rock or soil.he water table is the surface where the water pressure head is equal to the atmospheric pressure (where gauge pressure = 0).