[DOC] [TLE] Aquifers and Groundwater, from USGS Water-Science School [PAR] Wells can be drilled into the aquifers and water can be pumped out. ... There 
might be a confining layer of less porous rock both above and below the porous 
layer. ... surrounding the aquifer confines the pressure in the porous rock and its 
water. ... In some permeable materials groundwater may move several metres in 
a day... [DOC] [TLE] Groundwater Storage - The Water Cycle, from USGS Water-Science ... [PAR] The Water Cycle: Groundwater storage, from from the USGS Water Science 
School. ... The upper layer of the soil is the unsaturated zone, where water is 
present in ... Rocks have different porosity and permeability characteristics, which 
means that ... In a way, this hole is like a dug well used to access groundwater, 
probably... [DOC] [TLE] The Groundwater Foundation : Get Informed : The Basics ... [PAR] When tapped by a well, water in confined aquifers is forced up, sometimes above 
the ... through its various states (vapor, liquid, solid); also known as the water 
cycle. ... A layer of porous material (rock, soil, unconsolidated sediment); in an 
aquifer, the .... Personal Information You Choose to Provide We may request that 
you... [DOC] [TLE] Groundwater Definitions - NYS Dept. of Environmental Conservation [PAR] When tapped by a well, water in confined aquifers is forced up, sometimes above 
the ... which is open only at the top and bottom of its casing, is one type of 
monitoring well. ... Permeable layer: A layer of porous material (rock or 
unconsolidated... [DOC] [TLE] Groundwater - Tulane University [PAR] Nov 11, 2015 ... The volume of groundwater is a equivalent to a 55 meter thick layer spread out ... 
Porosity determines the amount of water that a rock or sediment can contain. ... 
Well-rounded coarse-grained sediments usually have higher porosity ... An 
aquifer is a large body of permeable material where groundwater is... [DOC] [TLE] Aquifer - Wikipedia [PAR] An aquifer is an underground layer of water-bearing permeable rock, rock 
fractures or unconsolidated materials (gravel, sand, or silt) from which 
groundwater can be extracted using a water well. The study of water flow in 
aquifers and the characterization of aquifers is ... Aquitards are composed of 
layers of either clay or non-porous rock with low... [DOC] [TLE] What is Groundwater? - Live Science [PAR] Jan 8, 2015 ... Groundwater is any freshwater that lies beneath the surface of the Earth. ... 
reservoirs of groundwater  are found in regions with these porous bedrocks. ... 
a layer of rock or other material that is almost impenetrable to water, Phillips said. 
... the water table can drop so low that it's below the depth of a well. [DOC] [TLE] Groundwater - river, depth, oceans, freshwater, important, types ... [PAR] Groundwater is water that occurs below the Earth's surface at depths where all 
the pore ... In the rainy season of humid areas, the unsaturated zone may be a 
fairly thin layer, ... and hence, the ease by which water can flow through the 
material. ... under its own pressure, the well is called a flowing artesian well (see 
Figure 2). [DOC] [TLE] Groundwater Review [PAR] Confined aquifers have non-porous layers above and below the aquifer zone. ... 
Poorly sorted material is less porous than well-sorted material. Specific ... and 
DOES account for tortuosity of flow paths by including porosity in its calculation. [DOC] [TLE] Groundwater Basics [PAR] Sep 3, 2003 ... This tutorial will help explain the nature of groundwater, including its source, ... In 
porous surface material that water readily seeps through, such as sand ... Deeper 
bedrock layers may have few or no crevices where water can penetrate. ... A well 
that pierces a confined aquifer is known as an artesian well. [DOC] [TLE] Hydrogeology, from the NC Division of Water Resources [PAR] Aquifer - "A water-bearing layer of rock, or of unconsolidated sediments, that will 
yield water in a ... Moreover, aquifers are often considered

Question: It's a layer of porous material that provides ground water for a well
Answer: Aquifer