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1 <br />' Floods <br />The magnitude of the spring flood near Jensen, Utah, has been reduced since the closure <br />of Flaming Gorge Dam (Figure 6) [Schmidt, 1994]. The 2-, 5-, and 10-year recurrence floods <br />have been reduced by 26, I9, and 13 percent, respectively, from the period prior to dam closure <br />1 (1923 to 1962) compared to the period after dam closure (1963 to 1993) (Table 1) [Schmidt, <br />1994]. Schmidt [1994] used correlations between the USGS gage near Jenson and other gages <br />to extend the Jensen gage record to include the period 1923 to 1947. <br />Prior to this study, 6 years of drought occurred in the study area (Figure 7). The annual <br />peak flows of 1993 and 1994, the period of this study, were each less than the pre-dam 2-year <br />recurrence flood (622 m3/s). The magnitude of the 1993 flood (570 rn3/s), with an estimated <br />~" recurrence of 4.5 years for the post-dam period, caused flooding through much of the central <br />Uinta Basin. The flood peak of 1994 was 331 m3/s and was similar in magnitude to those of the <br />® period between 1987 to 1992. <br />`~ Table 1. Recurrence Interval, in Years, of Peak Dischar es for the Green River near Jensen, <br />g <br />Utah. Discharge in Cubic Meters per Second with Values in Cubic Feet per Second <br />in Parentheses for the Periods Before (1923 to 1962) and After (1963 to 1993) <br />Closure of Flaming Gorge Dam [From Schmidt, 1994] <br />Recurrence Interval (years) <br />Years 1.25 2 5 10 <br />1923-1962 446.4 622.1 791.6 869.6 <br />(15764) (21967) (27952) (30707) <br />i 1963-1993 326.3 463.0 640.5 753.3 <br />(11521) (16347) (22617) (26598) <br />t <br /> <br /> <br />1 <br /> <br />A-15 <br />