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<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />001580 <br /> <br />1000 <br /> <br />en <br />~~ <br />Ww <br />1-> <br />Ww <br />~~ <br />~~ <br />zU> <br />Ow <br />-> <br />1-0 <br />~a:l <br />w~ <br />~ <br />w <br /> <br /> <br />e <br /> <br />t- <br /> <br />Lees Ferry gage <br /> <br />900 <br /> <br />e. <br /> <br />800 <br /> <br />lower Marble Canyon gage <br /> <br />700 <br /> <br />Grand Canyon gage <br />. >< >-~ <br />upper Grand Canyon lower Marble Canyon <br /> <br />upper Marble Canyon <br /> <br />>-~ >- <br />Glen Canyon <br /> <br />~28>-~5r <br />7100 7400 <br /> <br />~ >- <br />38 <br />3600 <br /> <br />~ >- <br />3.3 <br />3500 <br /> <br />~22 >- <br />5900 <br /> <br />400 ~ <br />o <br />-l <br />;J: <br />Z <br />s: <br />m <br />-l <br />m <br />:::tl <br />U> <br /> <br /> <br />200 <br /> <br /> <br />80 <br /> <br />60 <br /> <br />227 m3Js <br />40 20 <br />LOCATION. IN RIVER MILE <br /> <br />o <br /> <br />o <br /> <br />Figure 5. Graph showing longitudinal profile of the Colorado River and reach average channel width at 85 and 2750 <br />m3/s. The profile data are those collected by the GCMRC and analyzed by Magirl et al. (unpubl. manuscript). Depth <br />to bedrock data are those reported in Table 2. Double bar arrows are the extent of the 5 study reaches shown in <br />Figure 1. The upper number is the number of EDZs (eddy deposition zones) per river km and the lower number is the <br />median area of the EDZs, in square meters. <br /> <br /> <br />B. <br /> <br />(r' <br />~' <br />ai,. <br />f' <br />t'.... ~ . , <br /> <br />-- .". <br />\;.. ''"''-. _ ..AlII' <br />.,\:': '... <br />. ,. .-.....>..,",..,. . '. <br />'-'.:' - ."- <br />, . <br />~.~ .. <br /> <br />Figure 6. Photographs of the Colorado River. A. Upstream view in lower Marble Canyon across the debris fan at the <br />mouth of Little Nankoweap Creek, near River Mile 52. Valley width is relatively wide here. B. Downstream view <br />immediately downstream from Unkar Rapid in upper Grand Canyon near River Mile 73. Here, the valley abruptly <br />narrows in the upper part of the photograh where the resistant lower part of the Precambrian Dox formation is <br />encountered. The riffle in the center of this photograph occurs where the river flows over the gravel bar at the <br />downstream end of the Unkar fan-eddy complex. <br /> <br />3.0 The Valley of the Colorado River 9 <br />