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<br />500,000 <br /> <br />0 <br />z "G1" <br />0 200,000 / <br />0 <br />w <br />Cf) 1-. <br />II --,. <br />W <br />0- <br />f- <br />W <br />w 100,000 <br />LL <br />0 <br />en <br />::J <br />0 <br />~ 8 DEPOSITS <br />ill 50,000 ~ UNDERLYING <br />('J <br />II DEPOSIT "G1" <br /><{ <br />I <br />0 <br />~ <br />0 <br />" <br /><{ <br />W <br />0- 20,000 <br /> <br /> <br /> <br /> <br />10,000 <br />0.001 <br /> <br />0,01 <br /> <br />0.1 1 10 100 <br />RETURN PERIOD, IN YEARS <br /> <br />1,000 <br /> <br />10,000 <br /> <br />EXPLANATION <br /> <br />o <br /> <br />X <br /> <br />.... <br />. <br /> <br />PRE-DAM PARTIAL-DURATION FLOOD SERIES FROM LEES FERRY GAGING STATION RECORD <br />PRE-DAM ANNUAL FLOOD SERIES FROM LEES FERRY GAGING STATION RECORD <br /> <br />PALEOFLOOD ASSOCIATED WITH THE 1,200-1 ,600-YEAR-OLD CREVICE DEPOSIT <br />PALEOFLOOD DATA COMPUTED FROM THE REVISED DISCHARGES FROM THIS STUDY <br />AND THE ORIGINAL RETURN PERIODS FROM O'CONNOR AND OTHERS (1994) <br /> <br />UPWARD EXTENSION OF PRE-DAM PARTIAL-DURATION FLOOD SERIES BASED <br />ON THE PALEOFLOOD DATA COMPUTED FROM THE REVISED DISCHARGES <br />AND ADJUSTED RETURN PERIODS FROM THIS STUDY <br /> <br />. <br /> <br />Figure 36. Partial-duration and annual flood-frequency analyses forthe pre-dam Colorado River at Lees Ferry. In the partial-duration series, 40 <br />out of the 46 floods with peak discharges in excess of 50,000 cubic feet per second were snowmelt floods. Also included are the paleoflood <br />data of O'Connor and others (1994) recomputed on the basis of the revised discharges from this study. The bold black arrows show the return- <br />period adjustments that should be applied to paleoflood data. Arrow "1" indicates the return-period adjustment that should be applied to the <br />paleoflood associated with deposit "Gl" {given that "Gl" was likely deposited during the 1921 floodl, and arrow "2" indicates the return'period <br />adjustments that should be applied to the paleofloods associated with the eight deposits underlying "G1" (see text for further discussion). <br /> <br />0222'5, <br /> <br />, <br /> <br />Analvsis of the Continuous Record of Instantaneous Discharge 53 <br />