from the article ...
An artesian aquifer is a confined aquifer containing groundwater that will flow upward through a well without the need for pumping. Water may even reach the ground surface if the natural pressure is high enough, in which case the well is called a flowing artesian well. An aquifer provides the water for an artesian well. An aquifer is a layer of soft rock, like limestone or sandstone, that absorbs water from an inlet path. Porous stone is confined between impermeable rocks or clay. This keeps the pressure high, so when the water finds an outlet, it overcomes gravity and goes up instead of down.
The recharging of aquifers happens because the water table at its recharge zone is at a higher elevation than the head of the well.
|Last edited August 16, 2009
Return to WelcomeVisitors