Porous, water-bearing layers of sand, gravel, and rock below the earth's surface; reservoirs for groundwater.

( Beetle FAQs) - water-bearing strata of permeable rock, sand, or gravel.

layers of earth that contain water

underground water stored between rocks or sediment that is drawn upon by wells and streams. Deep-water aquifers are a non-renewable source of fresh water and are being depleted, although how much water remains is unknown. See http://ga.water.usgs.gov/edu/earthgwaquifer.html for more information.

layers of rock or soil able to hold or transmit much water.

Water bearing strata of the ground

Porous, water-saturated layers of sand, gravel or bed rock through which groundwater flows that can yield an economically significant amount of water.

A water bearing soil or rock formation that is capable of yielding enough water for human use.

soil or rock formations that hold substantial quantities of water

A naturally occurring underground geologic formation which stores a significant amount of water.

One or more geologic formations containing sufficient saturated porous and permeable material to transmit water at a rate sufficient to feed a spring or for economic extraction by a well.

The special underground rock layers that hold groundwater, which are often an important source of water for public water supply, agriculture and industry.