In the material, water flowing from a newly drilled aquifer without pumping is described as an artesian wall. What is the term used for this phenomenon?

• A. Artesian Wall
• B. Artesian Well
• C. Natural Spring
• D. Unconfined Aquifer

Answer: (A)

This phenomenon is about water being under pressure in a confined aquifer and pushing it up when a well is drilled. A confined aquifer sits between impermeable layers, so the water is pressurized. When you penetrate it with a borehole, the pressure can force the water up the hole and even to the surface without pumping. That behavior is described as an artesian condition, with the discharge called an artesian well or artesian flow. A natural spring is water emerging at the surface without a well, typically from an unconfined area or where the water table intersects the surface. An unconfined aquifer lacks the confining pressure that creates the artesian effect. Some study sources may use an unconventional term like “artesian wall,” but the standard terminology is artesian well or artesian flow.