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<br />Water used by hydroelectric-power plants is sometimes not included in <br />water-use data summaries because it is a nonconsumptive use of water and <br />because water is withdrawn from a stream only for short times and distances. <br />However, these data are included in this report because hydroelectric-power <br />plants have rights to, and use, 7,270 million gallons per day of water that is <br />not available for upstream consumption. The location of hydroelectric-power <br />plants in Colorado is shown in figure 10. Because of the large topographical <br />relief in Colorado, on the average only 3.0 million gallons per day of water <br />are needed to produce 1 gigawatt-hour of electricity; this ratio is the fifth <br />smallest among all the States. <br /> <br />Total power water use amounted to 7,393 million gallons per day, making <br />it the second largest category of water use in the State. Fossil-fuel plants <br />used 121 million gallons per day while producing 26,500 gigawatt-hours of <br />power, nuclear-power plants used 1.6 million gallons per day but produced no <br />power during 1985, and hydroelectric-power plants used 7,270 million gallons <br />per day while producing 2,400 gigawatt-hours of electricity. Less than 1 <br />percent of this water was consumptive use. Tabular summaries of power <br />water-use data are listed in tables 11 and 12 (for counties) and tables 22 <br />and 23 (for hydrologic subregions) in the "Supplemental Data" section at the <br />back of this report. <br /> <br />Other Water Uses <br /> <br /> <br />Other water uses will be discussed in two groups--those that are included <br />in this study under the water-use category called "Other," and those that are <br />not included in this study. The "Other" water-use category (shown in the <br />"Water-Use Data" section of this report, and in tables 3 and 14 in the <br />"Supplemental Data" section at the back of this report) consists of water <br />withdrawn by public-supply systems but not delivered to commercial, domestic, <br />industrial, or power users. This consists of water lost in transmission of <br />raw water to treatment plant facilities, water used in treatment plants, water <br />lost in distribution systems, and public water use. Public water use includes <br />water provided by public-supply systems for firefighting, municipal swimming <br />pool uses, park irrigation, and street cleaning. These other water uses <br />accounted for an estimated 138 million gallons per day of water during 1985. <br /> <br />Some water uses were not included in this study. Water use by fish <br />hatcheries, second-source domestic water lise, reservoir evaporation (except <br />for mining use), and water-augmentation-plan uses were not investigated. <br />Several instream water uses also were not investigated, including water for <br />habitat protection, recreational uses, and water-quality maintenance uses. <br />Other water uses were undoubtedly overlooked. Some water uses cannot easily <br />be quantified, and others may require that the classification structure for <br />water-use data be expanded. <br /> <br />25 <br />