Porous, water–saturated layers of sand, gravel, or bedrock that can yield an economically significant amount of water
A structure built across a river to control the river’s flow or to create a reservoir
Purification of salt water or brackish (slightly salty) water by removal of dissolved salts
Condition in which an area does not get enough water because of lower–than–normal precipitation or higher–than–normal temperatures that increase evaporation
Flat valley floor next to a stream channel. For legal purposes, the term often applies to any low area that has the potential for flooding, including certain coastal areas
Water that sinks into the soil and is stored in slowly flowing and slowly renewed underground reservoirs called aquifers
Natural replenishment of an aquifer by precipitation, which percolates downward through soil and rock
Any area of land allowing water to percolate down through it and into an aquifer
Surface runoff of water that generally can be counted on as a stable source of water from year to year
Artificial lake created when a stream is dammed
Slow or rapid sinking of part of the earth’s crust that is not slope–related
Water flowing off the land into bodies of surface water
Precipitation that does not infiltrate the ground or return to the atmosphere by evaporation or transpiration
Water that is not directly consumed but is used to produce food and other products
A rough measure of the volume of water that we use directly and indirectly to keep a person or group alive and to support their lifestyles
Upper surface of the zone of saturation, in which all available pores in the soil and rock in the earth’s crust are filled with water
Land area that delivers water, sediment, and dissolved substances via small streams to a major stream
Zone in soil that is not saturated with water and that lies above the water table
Zone where all available pores in soil and rock in the earth’s crust are filled by water
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