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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />V. HYDROLOGY AND HYDRAULICS, EXISTING CONDITIONS <br /> <br />A. Basin Description <br /> <br />The drainage basin tributary to Fuchs Reservoir, shown on <br />Figure IV, extends to the southwest of the reservoir and has an area <br />of about 2.78 square miles (1,780 acres). The highest elevation in <br />the basin is Grayback Mountain, 12,616 feet in elevation. The <br />approximate elevation of the crest of the dam is 10,500 feet m.s.l. <br />The difference in e 1 evat i on of the watershed used to determi ne the <br />time of concentration is 2,110 feet. The basin length along the <br />longest water course is about 3.03 miles. <br /> <br />The forested area, covering about 75 percent of the total <br />drainage area, consists mainly of pine, fir and aspen trees. The <br />meadowland (about 15% of the area) and rangeland (about 10% of the <br />a rea) have a re 1 at i ve ly good cover of nat i ve grasses and forbs. The <br />soils in the basin are of three Soil Conservation Service (SCS) <br />Associations: <br /> <br />1. Cryoboralfs-Rock Outcrop Association <br />2. Cryaquepts-Cryquolls Association <br />3. Valent-Vona Association <br /> <br />The hydrologic soil groups for these soils are 20 percent group <br /> <br /> <br />A, 58 percent group Band, 22 percent group C. <br /> <br />- V-I - <br />