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<br />l!~11 <br />.' ,:rl! <br /> <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />. <br /> <br />.-' <br /> <br />~ABLE OF CONTENTS (Concluded) <br /> <br />Review Procedure <br /> <br />Effect of Reduced Inflow Design Flood <br />USBR Scheme D-5 <br />USBR Scheme F-4 <br />D&M Schemes <br />Effect of Reservoir Operating Assumptions <br /> <br />USBR Criteria <br /> <br />. <br /> <br />Sensitivity of IDF Routings to Starting <br />Reservoir Elevation . . . . . . . . . <br /> <br />Sensitivity of IDF Routings to Spillway Design <br /> <br /> <br />Auxiliary Spillway Criteria <br /> <br /> <br />Tradeoffs Between Costs and Risks <br /> <br /> <br />Risks of Dam Failure <br /> <br /> <br />IDF Outflows as Related to Historical Floods <br /> <br />Other Considerations in <br /> <br />Accepting Risks <br />if Dam Failure is <br /> <br />Increases <br />Risked <br />Freeboard <br />Summary of <br /> <br />in Hazards <br /> <br />'. <br /> <br />Safety Factors <br /> <br />The Recommended IDF <br /> <br />Risks of Auxiliary Spillway Damage <br /> <br />Rationale for Acceptance of Risk <br /> <br />Frequency of Given Reservoir Elevations within <br />Flood-Control Pool . . . . . . . . . . . <br /> <br />Frequencies of Given Reservoir Elevations at <br />Time of a Second, More Major Flood <br /> <br />Frequency of Operation of Auxiliary Spillway <br /> <br />Economics of Accepting Damage to the Auxiliary <br />Spillway . . . . <br /> <br />Other Considerations . <br /> <br />Conclusions Regarding Spillway Design <br /> <br />iii <br /> <br />Page <br />IV-3 <br /> <br />IV-4 <br /> <br />IV-4 <br /> <br />IV-S <br /> <br />IV-S <br /> <br />IV-7 <br /> <br />IV-7 <br /> <br />IV-9 <br />IV-9 <br />IV-IO <br />IV-13 <br />IV-13 <br />IV-13 <br />IV-14 <br /> <br />IV-14 <br />IV-14 <br />IV-IS <br /> <br />IV-IS <br /> <br />IV-17 <br /> <br />IV-17 <br /> <br />IV-20 <br /> <br />IV-21 <br />IV-22 <br /> <br />IV-23 <br />IV-27 <br />IV-28 <br />