Water rises in an artesian well because of the pressure exerted by the water that is trapped between two impermeable layers of rock or soil. This pressure is created when water from a higher elevation seeps into the ground and becomes trapped, unable to escape. As more water seeps in, the pressure increases and the water is forced up through the well.

The height to which the water rises in an artesian well is determined by the amount of pressure exerted by the trapped water. This pressure is affected by several factors, including the depth of the well, the amount of water seeping into the ground, and the permeability of the rock or soil layers.

Artesian wells are often used to provide water for drinking, irrigation, and other purposes. They can be a valuable resource, especially in areas where surface water is scarce.