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<br />Section IV: <br /> <br />Section V: <br /> <br />Section VI: <br /> <br />Changes Since Dam Construction . . . 23 <br /> <br />Pre-Dam River Flows Had Wide <br />Seasonal Variations In Magnitude, <br />Sediment Load, And Temperature . . . 23 <br /> <br />Post-Dam River Flows Fluctuate <br />Frequently, Carry Little Sediment, <br />And Are Colder . . . . . . . . . . . 25 <br /> <br />Resources Have Changed In Response <br />To Changes In The River. 27 <br /> <br />Dam Operations . . . . . 33 <br /> <br />The Major Operational Goal For <br />Glen Canyon Dam Is Water Storage <br />And Delivery To The Lower Basin . . 35 <br /> <br />Flood Releases Are A Function Of <br />Reservoir Level Targets, Uncertainty <br />In Runoff, And Operating Rules For <br />Handling Increases In Forecast <br />Runoff . . . . . ., '" . 37 <br /> <br />Fluctuating Releases Are Made To <br />Match Electricity Production To <br />Demand And To Sell The Most Power 40 <br /> <br />Impacts Of Current Operations 45 <br /> <br />Current Operations Are Characterized <br />By Flood Releases And Fluctuating <br /> <br />Releases . . . . . . . . . . . . . . 45 <br /> <br />Flood Releases Have Negative <br />Impacts On Terrestrial Resources <br />And Recreation . . . . . . . . . <br /> <br />. 49 <br /> <br />Fluctuating Releases Have Negative <br />Impacts On Recreation, Mixed Effects <br />On Aquatic Resources, And Little <br />Effect On Terrestrial Resources 56 <br /> <br />Flood Releases Have Greatest <br />Potential For Long-Term And <br />Irreversible Impacts . . . . . . . . 60 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />