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<br /> <br />Table 1. Segment characteristics of the Colorado River in Marble and upper Grand Canyons <br /> <br />. <br /> <br /> Reach-average channel Reach-average channel Ratio of base flow <br /> width at base flow (227 width at flood stage (2746 channel to flood <br />River Mile m3/s), in meters1 m3/s), in meters1 channel width <br />Upper Marble Canyon <br />(RM 1-40) 78.1 111.5 0.71 <br />Lower Marble Canyon <br />(RM 40-61) 99.9 164.7 0.61 <br /> Upper Grand Canyon <br />Tapeats Gorge and <br />Big Bend <br />(RM 61-77) lOLl 171.0 0.61 <br />Upper Granite Gorge <br />(RM 77-87) 59.3 82.1 0.72 <br /> <br />I Reach-average width determined from maps of water's edge at indicated discharge. Water surface area at <br />indicated discharge was divided by reach length to determine average width. <br /> <br />. <br /> <br />Table 2. Depth to bedrock in the valley of the Colorado River <br /> <br />Location <br /> <br />data source <br /> <br />-15 <br />39.5 <br />47R <br />51.5L <br />52L <br />54R <br />66L <br /> <br />Depth to bedrock, in meters <br /> <br />31.41 <br />181 <br />3.7-(11.9,44.8) 2,3 <br />> 13.4 2 <br />>17.1 2 <br />>25.92 <br />2.7-9.4 2 <br /> <br />U. S. Bureau of Reclamation Dam Site Boring <br />U.S. Bureau of Reclamation, Topping et aI., unpubI. <br />Qamar and Rubin, unpubI.4 <br />Qamar and Rubin, unpubl. 4 <br />Qamar and Rubin, unpubl. 4 <br />Qamar and Rubin, unpubI. 4 <br />Qamar and Rubin, unpubl. 4 <br /> <br />I borehole <br /> <br />2 seismic reflection survey <br />3 respective depths of (middle, deepest) reflectors <br />4Rubin et at (1994a) <br /> <br />. <br /> <br />8 System-wide Changes in the Distribution of Fine Sediment in the Colorado River Corridor ... <br />