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<br />hydrologic subregion.--A geographic area that has boundaries defined by the <br />U.S. Geological Survey and Water Resources Council (U.S. Geological <br />Survey, 1982) and that consists of one or more stream drainage areas. <br />A subregion is the second largest class of these defined areas; there <br />are 17 subregions in Colorado (see fig. 1 and table 1). <br /> <br />hydrologic subregion code.--A 4-digit-integer code assigned to each hydrologic <br />subregion. <br /> <br />industrial water use.--Water used by manufacturing facilities, including <br />facilities that produce food and kindred products, steel, chemical and <br />allied products, paper and allied products, and machinery; also includes <br />printing and publishing facilities and petroleum refining. This category <br />does not include power generation, the mining of minerals, or the <br />extraction of crude petroleum and gasses, which are separate water-use <br />categories. <br /> <br />instream water use.--Surface water reserved for in-channel uses such as <br />wildlife habitat maintenance, recreation, navigation, and water-quality <br />maintenance. <br /> <br />irrigation water use.--Water applied to lands to assist in the growing of <br />crops and pastures or to maintain recreational lands such as parks and <br />golf courses. <br /> <br />land net.--The geographic reference system established by the Public Land <br />Survey System whereby the location of a surveyed parcel of land is <br />described by township, range, and section. <br /> <br />livestock water use.--Water used in the commercial raising of animals. <br /> <br /> <br />million gallons per day.--A rate of flow of water commonly used to quantify <br />water use. <br /> <br />mining water use.--Water used in the extraction of minerals: solids, such as <br />coal and ores; liquids, such as crude petroleum; and gases, such as <br />natural gas. Mining water use also includes quarrying, well operation <br />(dewatering), milling (crushing, screening, washing, flotation, and so <br />forth) and other preparation customarily done at the mine site or as <br />part of a mining activity. The term does not include the processing of <br />raw materials, such as smelting ores, refining petroleum, and slurry <br />pipeline operations. <br /> <br />net irrigation requirement.--The depth of irrigation water (exclusive of <br />precipitation), stored soil moisture, or ground water that is required <br />consumptively for crop production. <br /> <br />power water use.--Water used for hydroelectric and thermoelectric power <br />generation. <br /> <br />public-supply systems.--Entities that deliver water to communities for <br />domestic, commercial, industrial, and other uses; includes systems <br />serving 25 or more year-round residents or having at least 15 service <br />connections used by year-round residents. <br /> <br />viii <br />