artesian well

well made by boring deeply into the ground and water flows up due to internal pressure

See Great Artesian Basin for the water source in Australia. An artesian aquifer is a confined aquifer containing groundwater that will flow upwards out of a well without the need for pumping. An aquifer provides the water for a artesian well. An aquifer is a layer of soft rock, like limestone or sandstone, that absorbs water from an inlet path. Porous stone is crushed between impermeable rocks or clay. This keeps the pressure high, so when the water finds a hole, it defies gravity and goes up instead of down.
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Noun
1. a well drilled through impermeable strata into strata that receive water from a higher altitude so there is pressure to force the water to flow upward
(hypernym) well

Water held under pressure in porous rock or soil confined by impermeable geological formations.

artesian well
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