For the first time, scientists have mapped groundwater variables nationally to understand which aquifers are most vulnerable ...

Discussions about water resources often focus on rivers, streams, and reservoirs. Though unseen, groundwater is also an important source of the water supply. Aquifers, which are water-bearing ...

The challenge with continuing to depend on groundwater is the unpredictability and sensitivity of the deep aquifer, experts say.

U.S. Forest Service geologist Gordon Grant calls it a “geologic gift.” University of Oregon earth scientist Leif Karlstrom described it as “a big water tower” at the top of the mountains.