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DEFINITION OF TERMS <br />Aggregated subarea (ASA) is a grouping of subareas making up <br />a unit for which water supplies, requirements, specific problems, etc. , <br />are documented for assessment purposes.. <br />Consumption (consumptive requirements, consumptive use, con- <br />sumptive loss, depletion) refers to the quantities of fresh water that, <br />through withdrawal uses, are evaporated, transpired, or otherwise used <br />up by artificial impoundments and conveyances, irrigated cropland, irri- <br />gated ornamentive land use, manufactured products, domestic use, and <br />livestock. The term comprises that water which is so displaced in the <br />hydrologic cycle as to be no longer available for immediate reuse. Con- <br />sumption is determined indirectly by calculating the difference between <br />withdrawal and discharge, by deterministically calculating the difference <br />directly by extrapolation of empirical data, and by judgmental estimates. <br />Economic area (EA.) is an area designated by the Regional Econ- <br />omics Division of the Office of Business Economics (now Bureau of Econ- <br />omic Analysis) to facilitate programs of ,regional measurement, analy- <br />sis, and projections of economic activity.I ` It is formed along county <br />boundaries, but does not necessarily lie within one subarea or water re- <br />source region, <br />Discharge (return flow) refers to the quantities of water that are <br />returned to the supply after the withdrawal uses are completed. Dis- <br />charge includes water discharged directly to surface water bodies of <br />the public domain, water discharged to public or private sewers or other <br />collection systems, irrigation withdrawals not consumed by transpiration <br />or evaporation, and water that seeps or is injected into the ground for the <br />purpose of recharging usable aquifers. The term excludes water injected <br />for repressurizing oil or gas fields or for the ultimate disposal of wastes, <br />and water that is discharged into privately managed closed basins or hold- <br />ing ponds. <br />Economic, as used herein, refers to effects on national and regional <br />production, employment, and per capita income. <br />il Condensed definition from ''Water Resources Regions and Sub- <br />regions for the National Assessment of Water and Related Land Resources, " <br />U.S. Water Resources Council, July 1970. <br />iii <br />