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<br />r <br /> <br />with corresponding 1985 estimates. The text is supplemented with illustra- <br />tions and tables showing data for each State, Puerto Rico, the U.S. VIrgin <br />Islands, and the District of Columbia and for each of the 21 water-resources <br />regions. (Water-resources regions are shown on a map on the inside of the <br />front cover.) Totals are highlighted in the tables for ease of reference. At <br />the beginning of this report is a section on total water use by category and <br />source of water, and at the end is a section on trends in water use for the <br />period 1950-90. <br /> <br />TERMINOLOGY <br /> <br />The terms and units used in this report are similar to those used in <br />previous water-use circulars in this series. In this report, the term "off- <br />stream use" represents all water diverted or withdrawn from a surface- or <br />ground-water source and conveyed to a place of use. "Instream use" refers <br />to all uses taking place within the river channel itself. Hydroelectric power <br />generation is discussed as an "instream use," although some hydroelectric <br />power water uses could be considered as offstream use. The terms "fresh- <br />water~" "saline water," and "reclaimed wastewater," as types of water, are <br />defined in the glossary. Saline water is reported only for the industrial: <br />mining, and thermoelectric power categories. Some public supplies treat <br />saline water before it is distributed, but all public-supply withdrawals are <br />considered as freshwater in this report. Surface water and ground water, as <br />sources of water, and the categories of water use also are defined in the <br />glossary. In this report, withdrawals refer to self-supplied withdrawals, and <br />deliveries refer to public-supply deliveries. "Consumptive use" refers to <br />that part of the water withdrawn that is evaporated, transpired, incorpora1ed <br />into products and crops, consumed by humans or livestock, or otherwise <br />removed from the immediate water supply. <br /> <br />SOURCES OF DATA AND METHODS <br />OF ANALYSIS <br /> <br />In cooperation with State and local agencies, the water-use estimates <br />for 1990 were compiled by the U.S. Geological Survey's District Offices <br />for each county in the United States, Puerto Rico, and the U.S. VIrgin <br />Islands, and for 2,149 water-resources cataloging units. [For an explana- <br />tion of cataloging units, see Seaber and others (1987)]. These estimates <br />were entered into a State water-use data base in each District Office and <br />submitted to the Survey's headquarters in Reston, Va. The information was <br />aggregated by State (including Puerto Rico, the U.S. VIrgin Islands, and the <br />District of Columbia) and by the 21 water-resources regions for each <br /> <br />^,r'I'?'~~--' <br /> <br />INTRODUCTION I 3 <br /> <br />" -, <br /> <br />,,..,, ~',.",., <br />