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Drawing of an artesian well. An artesian aquifer is an underground layer which holds groundwater under pressure. This causes the water level in the well to rise to a point where the pressure is equal to the weight of water putting it under pressure.n aquifer is a geologic layer which can hold water such as sand and gravel, limestone, or sandstone, through which water flows and is stored. An artesian aquifer is trapped between rocks or clay which causes the pressure.
When a well is drilled into a confined aquifer, the water that is under pressure in it will rise in the well casing and may reach the surface. Wells with water flowing to the surface are often called free-flowing artesian wells. In most cases, wells drilled into artesian aquifers do not flow. Unconfined. An unconfined aquifer is a layer of water that has a confining layer on the bottom and a layer of permeable soil above it. The recharge are is all of the land area above the unconfined aquifer. The water level in wells drilled into an unconfined aquifer will be at the same elevation as the water table.