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<br />I <br />I <br />I <br />I <br />I <br />~ <br />~ <br />~ <br />, <br />~ <br />~ <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Figure 1-1. <br /> <br />Figure 1-2. <br /> <br />Figure 11-1. <br /> <br />Figure III-1. <br /> <br />Figure IV-I. <br /> <br />Figure IV-2. <br /> <br />Figure IV-3. <br /> <br />Figure IV-4. <br /> <br />Figure V-I. <br /> <br />LIST OF FIGURES <br /> <br />The Colorado River watershed <br />showing Upper and Lower Basins, <br />drainages, dams, and impoundments 2 <br /> <br />study Area Map <br /> <br />3 <br /> <br />. . . . . . <br /> <br />The GCES occurred (1983-1986) <br />during a transition from <br />nearly continuous fluctuating <br />flows to more frequent steady, <br />high releases and flood releases . 14 <br /> <br />Composite illustration of the <br />critical resources in the Grand <br />canyon . . . . . . . . 19 <br /> <br />Mean daily discharge, total daily <br />sediment load, and mean daily water <br />temperature from low- and high- <br />water years prior to dam con- <br />struction, measured at the U.S. <br />Geological survey gaging station <br />at Lees Ferry . . . . . . . . . . . 24 <br /> <br />Mean daily discharge, total daily <br />sediment load, and mean daily water <br />temperature from low- and high- <br />water years following dam con- <br />struction, measured at the U.S. <br />Geological Survey gaging station <br />at Lees Ferry . . . . . . . 26 <br /> <br />Regulation of river flows has <br />significantly changed the <br />distribution of vegetation and <br />sediment along the riverbanks " 28 <br /> <br />Banks and sandbars that were <br />bare prior to dam construction <br />(top) have become covered with <br />riparian vegetation (bottom) .. 29 <br /> <br />Water is released from Lake <br />Powell through the powerplant, <br />the river outlet works, or the <br />spillways . . . . . . . . . . . . . 34 <br />