In west-central Kansas, up to a fifth of the irrigated farmland along a 100-mile swath of the aquifer has already gone dry.
Palestinians are only allowed to dig wells 150 meters deep, but Israelis dig to the aquifer.
Improper mining could kill the Kabul River and poison the aquifer for generations to come.
Vast stretches of Texas farmland lying over the aquifer no longer support irrigation.
Refilling the aquifer would require hundreds, if not thousands, of years of rains.
Which will supply the larger region with artesian wells, an aquifer whose dip is steep or one whose dip is gentle?
And we know just what the strata formations are both below the reservoir and in the aquifer downstream.
The aquifer dips toward the region of the wells from higher ground, where it outcrops and receives its water.
An underground layer of permeable rock, sediment (usually sand or gravel), or soil that yields water. The pore spaces in aquifers are filled with water and are interconnected, so that water flows through them. Sandstones, unconsolidated gravels, and porous limestones make the best aquifers. They can range from a few square kilometers to thousands of square kilometers in size.