What allows water to be drawn through an artesian well without the aid of a pump?

the downward pressure of water within the aquifer


The only explanation as to why the water in the aquifer would be forced up through the well is that there is pressure on the water toward the opening created when the well is drilled. The illustration shows an aquifer extending downward and at an angle from the surface (the recharge area). The volume of water above the aquifer’s deeper waters can exert significant pressure on those deeper waters—pressure that a properly positioned artesian well can release.

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