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<br />001589 <br /> <br />. <br /> <br />Figure 17. Graph showing mean bed elevation at the Grand Canyon gage. A. entire period of record. B. post-dam <br />era. Mean bed elevation was calculated by dividing cross-section area by width. All elevations adjusted to that of the <br />lower gage. Arrows in B indicate times when configuration of BrightAngel Rapid changed due to debris '~ow or flash <br />flood. <br /> <br /> 10 <br />(f) <br />cc <br />UJ <br />I- <br />UJ 8 <br />::a <br />~ <br />::i <br />=> 6 <br />I- <br />~ <br />>- <br />cc <br />~ 4 <br />I- <br />10 <br />cc <br /><( <br />z 2 <br /><( <br />UJ <br />> <br />0 <br />co 0 <br /><( <br />z <br />0 <br />i= <br />~ .2 <br />UJ <br />...J <br />UJ <br /> -4 <br /> N N N N <br /> N '" .... U') <br /> a> (}l a> a> <br />. - - ~ - <br /> ~ ~ <br /> c c c C <br /> m m m m <br /> -, -, -, -, <br /> <br />.A.. <br /> <br />water surface elevation <br />at time of measurement <br /> <br />~ <br /> <br /> <br />mean bed <br />elevation <br /> <br />~ <br /> <br />N N N N <br />'" ...... <X) (}l <br />(}l a> (}l (}l <br />- - - - <br />c c c C <br />m m m m <br />-, -, -, -, <br /> <br /> 10 B. <br />(f) <br />cc <br />UJ 8 <br />I- <br />UJ <br />:2: <br />~ <br />::i 6 <br />=> <br />I- <br />~ <br />>- 4 <br />0: <br /><( <br />0: <br />I- <br />10 <br />0: 2 <br /><( <br />z <br /><( <br />~ <br />0 0 <br />ell <br /><( <br />Z <br />0 <br />i= -2 <br />~ <br />UJ <br />...J <br />UJ <br /> -4 <br /> '" <X) '" <X) '" <X) '" <X) <br /> <0 <0 ...... ...... <X) <X) m m <br /> (}l (}l a> a> a> a> a> (}l <br /> <- <- ~ <- <- ~ <- <- <br /> - - - - - <br /> - <- - - - <br /> c c c c c c c C <br /> m m m m m m ro m <br /> -, -, -, -, -, -, -, -, <br /> <br />. <br /> <br /> <br />5.0 Changes in the Topography of the Main-Channel Bed 27 <br />