Aquifers

right|thumb|upright=1.5|An illustration showing groundwater in aquifers (in blue) (1, 5 and 6) below the [[water table (4), and three different wells (7, 8 and 9) dug to reach it.]]

contamination of water bodies

artificially drilled well in a depression below the groundwater table

thumb|upright=1.8|Schematic of an aquifer showing confined zones, groundwater travel times, a spring and a [[well]]

Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%. Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the surface (cf. closed-cell foam).

set of containers containing a homogeneous fluid

process by which water on the ground surface enters the soil

specific measurement of liquid pressure above a vertical datum

area in an aquifer, below the water table

measure of the ability of a porous material to allow fluids to pass through it

major rift valley in Germany

top of a saturated aquifer, or where the water pressure head is equal to the atmospheric pressure

the unsaturated aquifer above the water table

pollution that occurs when when pollutants are released to the ground and seep down into groundwater

stagnation of water

process of infiltration and percolation of water in the ground and aquifers

aquifer

movement of saline water into freshwater aquifers

subsurface layer in which groundwater seeps up from a water table by capillary action

thumb|upright=1.35|A seep puddle in a [[forest clearing]] A seep or flush is a moist or wet place where water, usually groundwater, reaches the Earth's surface from an underground aquifer.

unsustainable extraction of groundwater

Phreatic is a term used in hydrology to refer to aquifers, in speleology to refer to cave passages, and in volcanology to refer to a type of volcanic eruption.

column of one fluid moving through another

used to evaluate an aquifer by pumping from a well

Sinking of land due to groundwater extraction

policy-making processes and legislation that affect water resources

direct injection of surface water supplies such as potable water, reclaimed water, or river water into an aquifer for later recovery and use

the amount of water that a portion of an aquifer releases from storage, per unit mass or volume of aquifer, per unit change in hydraulic head

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