Artesian aquifer
An artesian aquifer is a confined aquifer containing groundwater under positive pressure. An artesian aquifer has trapped water, surrounded by layers of impermeable rock or clay which apply positive pressure to the water contained within the aquifer. if a living were to be sunk into an artesian aquifer, water in the well-pipe would rise to a height corresponding to the point where hydrostatic equilibrium is reached.
A well drilled into such(a) an aquifer is called an artesian well. whether water reaches the ground surface under the natural pressure of the aquifer, the living is termed a flowing artesian well.
Fossil water aquifers can also be artesian if they are under sufficient pressure from the surrounding rocks, similar to how numerous newly tapped oil wells are pressurized.
From the preceding statement, it can be inferred that not all aquifers are artesian i.e., water table aquifers arise where the groundwater level at the top of the aquifer is at equilibrium with atmospheric pressure. The recharging of aquifers happens when the water table at its recharge zone is at a higher elevation than the head of the well.