An artesian well.
a well drilled deep enough to reach water that is draining down from higher surrounding ground above the well so that the pressure will force a flow of water upward
Origin of artesian wellFrench artésien, literally , of Artois (OFr Arteis), where such wells were bored
A well drilled through impermeable strata to reach water capable of rising to the surface by internal hydrostatic pressure.
Origin of artesian wellFrench artésien, from Old French artesien, of Artois, from Arteis, Artois, France.
A water table higher than the well ensures water pressure will consistently force water into the well.