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The three areas deemed important to [his study are [he Yampa River, the <br />~ Williams Fork River and the upland drainages of the mine plan area. <br />3.1 Yampa River Valley <br />The Yampa River Valley (or subbasin) is par[ of the larger Yampa River <br />basin as reported by Steele et al (1979). The geographic limits of the <br />basin and Che delineation of [he Yampa River and Li[[le Snake River sub- <br />basin's are shown in Figure 3-1. <br />The Yampa River's headwaters occur in the high mountains of the Park <br />Range along the continental divide (Exhibit III). The drainage area of <br />the Yampa River is approxiamtely 3,410 square miles. <br />• ~ Timing of flows from the valley demonstrate the importance of snowmelt <br />runoff to water yield. Figure 3-2 shows a graph of the discharge of the <br />Yampa River a[ Hayden and Maybell from March 1971 to January 1973. About <br />65 percent of the flow occurs in May and June with up to 97 percent <br />occurring from April to June a[ selected gaging stations within the <br />valley (Steele, et al 1979). Minimum flows occur from August through <br />February. Iorns (1965) reported that summertime flows in streams of the <br />basin from July through October generally include a large component of <br />groundwater discharge. <br />it <br />-4- <br />