Most deep groundwater does not need screening before other purification steps.

Subsequent volcanic or tectonic activity occasionally fractured the cryosphere, releasing enormous quantities of deep groundwater to the surface and carving huge outflow channels.

By pumping brine to the surface in the early 1800s, the amount of brine withdrawn from deep groundwater consequently increased.

The remaining 3 percent is fresh water, most locked up as ice, soil moisture and deep groundwater.

Groundwater quality can range from fresh to highly saline, with the deeper groundwater generally less saline.

Perhaps the surface of Inferno was bone-dry, but clearly there was still deep groundwater to be found.

Unlike giant reed, the saltcedar has deeper roots, not only making it more difficult to remove but allowing it to access and use up deep groundwater.

Of that water, 40% is deep groundwater and a little more than a quarter is rainwater.

For metals a distinction is made between deep and shallow groundwater.