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<br />reclaimed sewage.--Treatment plant effluent that has been diverted or <br />intercepted for use before it reaches a natural waterway or aquifer. <br /> <br />return flow.--The quantity of water that gets back to a ground- or surface- <br />water source after release from the point of use and thus becomes <br />available for further use. <br /> <br />self-supplied water.--Water withdrawn by a user and not obtained from a <br />public-supply system. <br /> <br />surface water.--An open body of water such as a stream or a lake. <br /> <br /> <br />system production.--The quantity of treated water available for distribution <br />to a public supplier's customers. <br /> <br />thermoelectric power water use.--Water used for generating electric power <br />using fossil fuel (coal, oil, or natural gas), geothermal, or nuclear <br />energy. <br /> <br />water use.--The use of water by humans for designated purposes. <br />a general term that can refer to any facet of the water-use <br />including water source, water use, and water disposition. <br /> <br />Water use is <br />cycle, <br /> <br />water-use category.--A designated purpose for the use of water by humans. In <br />this report, seven water-use categories are discussed: commercial, <br />domestic, industrial, irrigation, livestock, mining, and power. <br /> <br />water-use cycle.--The process of water use, beginning when water is removed <br />from the hydrologic system for use, and ending when water is returned to <br />the hydrologic system after use. The water-use cycle can be divided into <br />three parts: the source, use, and disposition of water. <br /> <br />water year.--Defined within the U.S. Geological Survey as the l2-month period, <br />October 1 through September 30. The water year is designated by the <br />calendar year in which it ends and which includes 9 of the 12 months. <br />Thus, the year ending September 30, 1985, is called the "1985 water year." <br /> <br />withdrawal.--Water removed from the ground or diverted from a surface-water <br />source for use. <br /> <br />ix <br />