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<br />Final Report <br /> <br />September 2000 <br /> <br />CONTENTS <br /> <br />PRINCIPAL AUTHORS OF CHAPTERS OR MAJOR SECTIONS .................... 111 <br /> <br />ACKNOWLEDG.MENTS ....................................................... V <br /> <br />UST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi <br /> <br />LIST OF FIGURES .......................................................... xv <br /> <br />NOTATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix <br /> <br />EXECUTIVE SUMMARY ................................................... xxiii <br /> <br />1 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1 <br /> <br />1.1 Purpose and Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-2 <br />1.2 Changes in River Ecosystems of the Colorado River Basin .................. 1-3 <br />1.2.1 The Green River System ........................................ 1-7 <br />1.3 1992 Biological Opinion on Operation of Flaming Gorge Dam. . . . . . . . . . . . . .. 1-9 <br /> <br />2 FLAMING GORGE FLOW RECOMMENDATIONS ][NVESTIGATION .......... 2-1 <br /> <br />2.1 Study Area ........................................................ 2-1 <br /> <br />2.2 Study Objectives and Approach. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 <br /> <br />2.3 Research Flows .................................................... 2-4 <br /> <br />2.4 Development of Integrated Flow Recommendations . . . . . . . . . . . . . . . . . . . . . . . . 2-6 <br />2.4.1 Workshops and Technical Reviews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 <br /> <br />2.4.2 Synthesis ................................................... 2-7 <br /> <br />3 HYDROLOGY AND GEOMORPHOLOGY OF THE GREEN RIVER ............ 3-1 <br />3.1 Characteristics of the Green River Basin ................................. 3-1 <br />3.2 Operations of Flaming Gorge Dam ..................................... 3-4 <br />3.3 Description of Green River Reaches Downstream of Flaming Gorge Dam ...... 3-6 <br />3.4 Flows in the Green River Downstream of Flaming Gorge Dam. . . . . . . . . . . . . . . 3-9 <br />3.4.1 Seasonal Distribution of Green River Flows. . . . . . . . . . . . . . . . . . . . . . . 3-14 <br />3.4.2 Peak Flows in the Green River ................................. 3-14 <br />3.4.3 Base Flows in the Green River ................................. 3-18 <br />3.4.4 Tributary Contributions to Green River Flow ...................... 3-25 <br />3.4.5 Stage-Flow Relationships and the Effect of Hydropower Operations <br />on Daily Fluctuations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27 <br />3.5 Green River Water Temperatures ..................................... 3-30 <br />3.5.1 Summer Water Temperatures .................................. 3-32 <br />3.5.1.1 Water Temperature in Reach 1 ..........................3-32 <br />3.5.1.2 Water Temperature in Reach 2 ... . . . . . . . . . . . . . . . . . . . . . . . 3-33 <br />3.5.1.3 Water Temperature in Reach 3 .......................... 3-33 <br /> <br />Vll <br />