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<br /> <br />EXPLANATION <br /> <br />WATER USE. IN <br />MilliON GAllONS <br />PER DAY <br /> <br />D leu than 0.10 <br /> <br /> <br />D 0.10 to 0.60 <br /> <br /> <br />1....1 0.60 to 1.0 <br /> <br />1~~11.0 to 6.0 <br /> <br />II Greater than 6.0 <br /> <br />Figure 9.--Mining water use, by counties, during 1985. <br /> <br />power during 1985. All the thermoelectric-power plants are fossil fuel plants <br />except for one nuclear-power plant that did not generate power in 1985 (but <br />used 1.6 million gallons per day). The thermoelectric-power plants in <br />Colorado are of a variety of types. Some are small diesel generators that use <br />only small quantities of water in their cooling jackets. Some are once- <br />through plants where large volumes of water are withdrawn to pass through <br />cooling structures once before being returned to the natural system. In this <br />instance, little water is actually consumed. Some are closed-system plants <br />where much less water is withdrawn than in once-through plants. Closed-system <br />plants recycle the same water through their cooling facilities until it is <br />essentially entirely consumed. Thermoelectric-power plants used 123 million <br />gallons per day of water during 1985, and consumptive use was 37 million <br />gallons per day. Most thermoelectric-power plants in Colorado are near <br />population centers, but some are near the west-slope coal mines that provide <br />their fuel (fig. 10). <br /> <br />24 <br />