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<br />kilowatthour (kWh)--a unit of energy equivalent to
<br />one thousand watthours.
<br />
<br />livestock water use---water for livestock watering,
<br />feed lots, dairy operations, fish fanning, and other
<br />on-farm needs. Livestock as used here includes
<br />cattle, sheep, goats, hogs, and poultry. Also in~
<br />eluded are animal specialties. See also rural water
<br />use and animal specialties water use.
<br />
<br />million gallons per day (MgaIld)--a rate of flow of
<br />water.
<br />
<br />mining water use-water use for the extraction of min-
<br />erals occurring naturally including solids, sllch as
<br />coal and ores; liquids, such as crude petroleum; and
<br />gases, such as natural gas. Also includes uses asso-
<br />ciated with quarrying, well operations (dewater-
<br />ing), milling (crushing, screening, washing,
<br />floatation, and so forth), and other preparations
<br />customarily done at the mine site or as part of a
<br />mining activity. Does not include water used in
<br />processing, such as smelting, refining petroleum, or
<br />slurry pipeline operations. These uses are included
<br />in industrial water use.
<br />
<br />offstream use---water withdrawn or diverted from a
<br />ground- or surface-water source for public-water
<br />supply, industry, irrigation, livestock, thermoelec-
<br />tric power generation, and other uses. Sometimes
<br />called off-channel use or withdrawal.
<br />
<br />per capita use--the average amount of water used per
<br />person during a standard time period, generally per
<br />day.
<br />
<br />public supply-water withdrawn by public and private
<br />water suppliers and delivered to users. Public
<br />suppliers provide water for a variety of uses, such
<br />as domestic, commercial, thermoelectric power,
<br />industrial. and public water use. See also conuner-
<br />cial water use, domestic water use, thermoelectric
<br />power water use, industrial water use, and public
<br />water use.
<br />
<br />public-supply deliveries-water provided to users
<br />through a public-supply distribution system.
<br />
<br />public water use-water supplied from a public-water
<br />supply and used for such purposes as firefighting,
<br />street washing, and municipal parks and swimming
<br />pools. See also public supply_
<br />
<br />reclaimed wastewater-wastewater treatment plant
<br />effluent that has been diverted for beneficial use
<br />before it reaches a natural wateIVIay or aquifer.
<br />
<br />recycled water-water that is used more than one time
<br />before it passes back into the natural hydrologic
<br />system.
<br />
<br />residential water use-see domestic water use.
<br />
<br />return flow-the water that reaches a ground- or sur-
<br />face~water source after release from the point of use
<br />and thus becomes available for further use.
<br />
<br />reuse----see recycled water.
<br />
<br />fural water use--term used in previous water~use
<br />circulars to describe water used in suburban or farm
<br />areas for domestic and livestock needs. The water
<br />generally is self supplied, and includes domestic
<br />use, drinking water for livestock, and other uses,
<br />such as dairy sanitation, evaporation from stock ~
<br />watering ponds, and cleaning and waste disposal.
<br />See also domestic water use, livestock water use,
<br />and self-supplied water.
<br />
<br />vi
<br />
<br />saline water-water that contains more than 1,000
<br />milligrams per liter of dissolved solids.
<br />
<br />self-supplied water-water withdrawn from a surface-
<br />or ground-water source by a user rather than being
<br />obtained from a public supply.
<br />
<br />standard industrial classification (SIC) codes-
<br />four-digit codes established by the Office of
<br />Management and Budget and used in the classifica~
<br />tion of establishments by type of activity in which
<br />they are engaged.
<br />
<br />surface water-an open body of water, such as a
<br />stream or a lake.
<br />
<br />thermoelectric power water use--water used in the
<br />process of the generation of thermoelectric power.
<br />The water may be obtained from a public supply or
<br />may be self supplied. See also public supply and
<br />self-supplied water.
<br />
<br />transpiration-process by which water that is
<br />absorbed by plants, usually through the roots, is
<br />evaporated into the atmosphere from the plant sur-
<br />face. See also evaporation and evapotranspiration.
<br />
<br />wastewater-water that carries wastes from homes,
<br />businesses, and industries.
<br />
<br />wastewater treatment-the processing of wastewater
<br />for the removal or reduction of contained solids or
<br />other undesirable constituents.
<br />
<br />wastewater-treatment return flow-water returned
<br />to the hydrologic system by wastewater-treatment
<br />facilities.
<br />
<br />water-resources region-designated natural drainage
<br />basin or hydrologic area that contains either the
<br />drainage area of a major river or the combined
<br />drainage areas of two or more rivers; of 21 tegions,
<br />18 are in the conterminous United States. and one
<br />each are in Alaska, Hawaii, and the Caribbean.
<br />(See map on inside of front cover.)
<br />
<br />water-resources subregion-the 21 designated water-
<br />resources regions of the United States are subdivid-
<br />ed into 222 subregions. Each subregion includes
<br />that area drained by a river system, a reach of a
<br />river and its tributaries in that reach, a closed
<br />basin(s), or a group of streams forming a coastal
<br />drai.nage system.
<br />
<br />water transfer~artificial conveyance of water from
<br />one area to another.
<br />
<br />water use--1) in a restrictive sense, the term refers to
<br />water that is actually used for a specific purpose,
<br />such as for domestic use, irrigation, or industrial
<br />processing. In this repon, the quantity of water use
<br />for a specific category is the combination of self-
<br />supplied withdrawals and public~supply deliveries.
<br />2) More broadly, water use pertains to human's
<br />interaction with and influence on the hydrologic
<br />cycle, and includes elements such as water with-
<br />drawal, delivery, consumptive use, wastewater
<br />release. reclaimed wastewater, return flow, and
<br />instream use. See also offstream use and instream
<br />use.
<br />
<br />watthour (Wh}-an electrical energy unit of measure
<br />equal to one watt of power supplied to, or taken
<br />from, an electrical circuit steadily for one hour.
<br />
<br />withdrawal-water removed from the ground or
<br />diverted from a surface-water source for use. See
<br />also offstream use and self-supplied water.
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