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role the assessment should perform. The survey also will serve as a <br />vehicle to ferret out information sources on existing and ongoing studies <br />and programs that will be helpful in identifying and assessing problems <br />as part of the literature review. <br />Water resource region is one of 21 major river systems, partial <br />systems, or groups of systems in the United States designated by the <br />Water Resources Council (WRC) for use in assessment activities. <br />Water supply is the hydrologic yield of fresh water consisting of <br />the volume o sur ace water runoff plus groundwater that has not been <br />included in surface water measurements. The hydrologic yield implicitly <br />includes the effects of unaccountable net losses and evaporation from <br />natural water bodies. For the assessment, water supply will be deter- <br />mined on an average annual basis distributed monthly under both "virgin" <br />and current (1975) storage and operational conditions. Estuaries and <br />marine areas will be taken into account when aspects of the assessment <br />regarding surface acres of water, e.g. recreation and fish and wildlife, <br />are under consideration. Properties of water bodies are considered to <br />be (1) volume, (2) surface area, (3) depth and cross section, (4) quality <br />(organic and inorganic), (5) flow characteristics, and (6) aquatic habitat. <br />Water Use Efficiency refers to the relative level of water use <br />(withdrawal and consumption) per unit of product output. <br />Withdrawal (intake) refers to the quantities of water (fresh, brack- <br />ish, or salt) that are removed from the supply and delivered to the user <br />by publicly or privately developed and managed water collection and deli- <br />very systems, and includes both groundwater and surface water supplies. <br />Because both brackish and salt water withdrawals represent replacements <br />of fresh water withdrawals that might have been required had the replace- <br />ments not been available, and because the adequacy analysis for the con- <br />sumption of water is limited to fresh water only, the quantities withdrawn <br />should be identified as fresh, brackish, or salt water. <br />lx <br />