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reach, and that appears to be mostly due to lower flow levels in 2000 as compared to 1993; <br />changes in the 15-mile reach, where flows levels were similar, were generally quite small. <br />Nonetheless, the loss of side channels appears to be real in the vicinity of RM 183 and RM 173, <br />as does the increase in bar area and channel complexity near RM 175. The percentage change in <br />most features is small (< 20 %) and small in comparison to results presented in earlier studies, <br />which were based on photographs taken much further apart in time (Pitlick et al., 1999). <br />40000 <br />A <br />30000 <br />20000 <br />E <br />w 10000 <br />m <br />Q <br />c 0 <br />LO `r m <br />c -10000 <br />t <br />c1 -20000 <br />-30000 <br />¦ Main ¦ Side b Bar E3 Total <br />-40000 <br />River Mile <br />100 B <br />80 <br />60 <br />P 40 <br />Q 20 <br />S <br />°' 0 <br />c n rn rn co <br />t -20 u? m co r- <br />v <br />-40 <br />e <br />-60 <br />-80 <br />Main ¦ Side E3 Bar 0 Total <br />-100 ¦ <br />River Mile <br />Figure 14. Change in planimetric area of features within the channel of the Colorado River; <br />(a) absolute change in area (b) change expressed as a percentage of the initial area. <br />33