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<br />500,000 <br /> <br />A. <br /> <br />o POST"DAM PARTIAL-DuRATION FLOOD SERIES <br />200,000 x POST-DAM ANNUAL FLOOD SERiES <br /> <br />o <br />z <br />o <br />o <br />w <br />(f) <br />a: 20,000 <br />w <br />(L <br />f- <br />W <br />W <br />LL <br />o 10,000 <br />in 0.001 0.01 <br />::J <br />o <br />Z <br />:;I 500,000 <br />~ <br />a: B. <br />-< <br />I <br />o <br />(f) <br />o <br />~ 200,000 <br />-< <br />w <br />(L <br /> <br />100,000 <br /> <br />50,000 <br /> <br />100,000 <br /> <br />50,000 <br /> <br />20,000 <br /> <br />EXPLANATION <br />o PRE"DAM PARTIAL-DURATION <br />FLOOD SERiES <br />^ POST"DAM PARTIAL-DURATION <br />FLOOD SERIES <br />I UPWARD EXTENSION OF <br />PRB"DAM PARtIAL- <br />DURATION FLOOD SERIES <br />100 1,000 10,000 BASED oN THE <br />PALEOFLOOD DATA <br />COMPUtED FROM THE <br />REVISED DiSCHARGES <br />AND ADJUSTED <br />REtURN PERIODS <br />FROM THis STUDY <br /> <br />" <br /> <br />00" <br />1$ <br /> <br /> <br />0.1 <br /> <br />10 <br /> <br /> <br />10,000 <br />0.001 0,01 <br /> <br />0.1 1 10 100 1,000 10,000 <br />RETURN PERIOD, IN YEARS <br /> <br />02224 <br /> <br />Figure 37. The effect of dam operations on flood frequency on the Colorado River at Lees Ferry. (AI Comparison of post-dam partial-duration and annual <br />flood-frequency analyses. The annual flood-frequency analysis grossly overestimates the return periods for most post-dam floods. (~Partial-duration <br />flood-frequency analyses for the pre- and post-dam period. <br /> <br />~ <br /> <br />Analvsis of the Continuous Record of Instantaneous Discharge 55 <br />