An Artesian Well
An Artesian Well is a pump-less “water source” that uses pipes to allow underground water that is under pressure to rise to the surface. This type of well seems to defy gravity because the pressure that builds up between layers of rock gets relieved when water finds a path to the open air. In addition, the water has been naturally filtered because it passes through porous rock as it seeps into the earth to reach the aquifer, which is the underground water source. For centuries, people have drilled artesian wells to drink filtered water that doesn't need to be manually or mechanically hauled up from the depths. Porous stone is sandwiched between a top and bottom layer of an impermeable substance, such as clay, soil or shale rock. This keeps the water pressure high, so that at a point below the entryway of the flow, there is enough pressure to bring the water up when the pressure is released. Natural springs form in the same way when a gap in the impermeable rock perhaps triggere...