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<br />Final Report <br /> <br />3-25 <br /> <br />September 2000 <br /> <br />ofrecord, likely no more than 5% per day or less." Derivation of this suggested 5% value was based <br />on personal observations of flow variation in the Flathead River, Montana, rather than an evaluation <br />of Yampa River flows. In another publication, Stanford et al. (1996) presented an evaluation that <br />suggested that within-day variability of 5% or less was typical of the unregulated Columbia River in <br />Washington. However, this analysis was based on an evaluation of between-day comparisons of <br />mean daily flows averaged over a lO-year period (1920 to 1929). Such an approach is not valid for <br />a determination of within-day flow variability. <br /> <br />3.4.4 Tributary Contributions to Green River Flow <br /> <br />Important tributaries of the Green River downstream of Flaming Gorge Dam are the Yampa, <br />Duchesne, White, Price, and San Rafael Rivers. Figure 3.12 displays the flow contribution from each <br />of these rivers to the Green River during 1951 through 1979. Development of the water resources <br />within these basins affect the present-day contributions relative to the contributions shown in <br />Figure 3.12, especially in the Duchesne River basin. Table 3.9 contains estimated data on peak flows <br />and selected probabilities of occurrence for each of these tributary streams (Pick 1996). <br /> <br />The Yampa River originates along the continental divide near Steamboat Springs, Colorado. <br />It flows in a westerly direction and joins the Green River 105 km downstream from Flaming Gorge <br />Dam at Echo Park in Dinosaur National Monument. The Yampa River is the largest tributary of the <br />Green River and has a great influence on Green River flow regimes; 48% of the flow in the Green <br />River at the confluence of the Green and Yampa rivers is from the Yampa River basin. <br /> <br />White (12%) <br /> <br /> <br />San Rafael (2%) <br />Price (2%) \ Others (2%) <br /> <br /> <br />Duchesne (9%) <br /> <br />Figure 3.12.-Percent contribution oftributaries to total annual flow volume of Green River. <br />