Inside the Edwards Aquifer: A Three Part Technical Film, High School Level Teacher's Guide Page: 17
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Section Two - Vocabulary
Acre foot - the volume of water that would cover one acre of land to
a depth of one foot - 325,851 gallons (also - the approximate amount
of water that would serve the needs of one family for one year)
Balcones Fault Zone - the area bounding the Edwards Plateau to
the south, having extensive cracks and faults caused by the force of
crustal movement
Cubic feet per second - unit used to measure the amount of
recharge to the aquifer; one cfs is equivalent to 448.8 gallons per
minute
Hydrology - the science that deals with global water: its properties,
circulation, and distribution, on and under the earth's surface and in
the atmosphere, from the moment of its precipitation until it is
returned to the atmosphere through evapotranspiration or is
discharged into the oceans
Non-porous - lack of void space in the rock which reduces its ability
to hold water
Outcrop - that part of a geologic formation or structure that appears
at the surface of the earth
Porosity (porous) - the ratio of void space to particles; a larger ratio
would hold more water
Recharge - process by which water is added to an aquifer
Strata (plural of Stratum) - a layer of sedimentary rock, visually
separable from other layers above and below; a bed
Subsurface - the zone below the surface, whose geologic features are
interpreted on the basis of drill records and various kinds of
geophysical evidence; formed or occuring beneath the earth's surface
Void space - an opening or space in a rock or a soil, capable of holdingwater
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Edwards Underground Water District (Tex.). Inside the Edwards Aquifer: A Three Part Technical Film, High School Level Teacher's Guide, pamphlet, 1993; San Antonio, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1203801/m1/23/: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.