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<br />I <br /> <br />I <br /> <br />Table 20 <br />Peak Flow 1% Exceedence <br />Flood Insurance Study - 2004 <br />Dolores River near Dolores, Colorado <br /> D.A./mil) PeaklcfSI <br />"uppermainsll;'"m" <br />Dolores bclo,," Rico 105 2,440 <br />East Dolores above <br />West Fork 278 7.520 <br />West Dolores <br />almOUlh 168 3,820 <br />East Dolores plus <br />West Fork ..6 11,300 <br />lJoloresal <br />Dolores 5<>1 11.700 <br />Lost Canyon Ck <br />near Dolores 71 5,340 <br />Dolores below <br />Lost Canyon Ck 579 12,300 <br /> <br />I <br /> <br />to, McPhee Resen'oir <br /> <br />The 1100d insurance hydrology study includes an analysis of peak flo\\' frequency in connection <br /> <br />with stage on McPhee Reservoir. Without proper operation of McPhee Dam. a large !load event <br /> <br />could raise the reservoir stage high enough 10 1100d the city of Dolores. <br /> <br />McPhee Dam and Reservoir, completed in 1984. has not yet experienced a 1% chance <br /> <br />peak snowmelt or rainl100d inllow. The peak inflow to McPhee Reservoir occurred on 1984, <br /> <br />during a spring season wilh unusually high snowmelt. The snowmelt peak llow of6,450 cfs <br /> <br />observed on 25 May 1984 at Ihe Dolores gage was a 5% event. Ilowever. McPhee Reservoir had <br /> <br />only begun to fill: the snowmelt hydrograph did not significantly impact operation. XIcPhce <br /> <br />Reservoir does not have any designah..>d flood control storage. Sheets I and 2 of Plate 23 display <br /> <br />38 <br />