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• alluvial system. The Flume Gulch alluvial system is very narrow <br />and small in the Trapper permit area. Some subirrigation occurs in <br />the permit area when ground-water levels are high. <br />2.7.7.4-3 SIIRFACE WATER <br />Map M-58 presents the drainage areas for the GT and GC areas <br />of the Flume drainage. The drainage area for the GT area is 154 <br />acres at the permit boundary and 583 acres for the GC area. Figure <br />2.7-44 presents the channel cross sections at the GT and GC sites. <br />The slope of the channels at these sites are 0.17 and 0.117 ft/ft. <br />Hydraulic length of the main channel is 5087 feet and 7850 feet for <br />the GT and GC channels, respectively. Figure 2.7-45 presents the <br />• stream profiles of the GT and GC sites. This plot shows that the <br />elevation of the stream channel varies from less than 6800 feet-MSL <br />at the north end of the permit boundary to greater than 7200 feet- <br />MSL for the GT site. Relief over this area is 577 and 758 feet, <br />respectively, for average slopes of 11.3 and 9.7%. <br />Figure 2.7-46 presents the flow in the Flume draw at the <br />surface water S1 site on the GC Flume drainage area. The flow in <br />May of 1985 was greater than 800 gpm and gradually declined to less <br />than 100 gpm in July of 1985. The flow in the Flume draw increased <br />gradually in the Spring of 1986, but was significantly less due to <br />the decline in recharge to the aquifers in this area. Elow in the <br />Flume draw is a function of ground-water discharge after snowmelt <br />and, therefore, the dry cycles are very important relative to the <br />• quantity of flow in the draw. BHiIS® 11/0]/92 <br />2-5768 <br />~~- 2 ll-~!3 <br />~. .. <br />._ . _ <br />. _... _ . <br />