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<br />Thc annual flow duration data for Lost Canyon Creck. for raintlood and snowmelt, are <br /> <br />labulated on Plates 20 and 21. rcspectively. Thc peak flow frequency curves and observcd peak <br /> <br />l10ws for Losl Canyon Crcek are plotted on Plalc 22. Flow frequency curves for longer durations <br /> <br />arc nol presented because this flood insurance study did not include any stann centerings or <br /> <br />lloodplain delineation for Lost Canyon Creek. Based on an analysis of the only available <br /> <br />rainllood peak (in 1941) and the annual one-day rainllood data. the Lost Canyon Crcek rainllood <br /> <br />peak llow frequency curve from the 1976 hydrology study is still valid. Table 16 provides a <br /> <br />summary of flood magnitudes for the 10%, 2%, I %. and 0.2% chance recurrences for the below <br /> <br />Rico. at Dolores, and Lost Canyon Creck gages. <br /> <br />Table 16 <br />Peak Flow Frequency for Dolores Rh.-er <br />Flood '\Ia~nitudes and Percent Chance Rel'urrence <br />(See Plates 12, 1~. 16, 18. and 22 for other durations) <br />Dolores Rh:er below Rico <br /> <br />Percent Chance <br />Exec-cdenee <br /> <br />0.2 <br /> <br />2 <br /> <br />10 <br /> <br />Peak Flow (ers) <br /> <br />4,540 <br /> <br />2.590. <br /> <br />2,360. <br /> <br />1.810. <br /> <br />Dolores River at Dolores <br /> <br />Percent Chance <br />Exeeedenee <br /> <br />0.2 <br /> <br />2 <br /> <br />10 <br /> <br />Peak Flow (efs) 27.600 11.700 7.860 <br />- --- <br />_ _ _I:o_st ~an~'on Creek near Dolores <br />Percent Chance <br />Exeeedellce <br /> <br />5.550. <br /> <br />0.2 <br /> <br />2 <br /> <br />10 <br /> <br />Peak Flow (cfs) <br /> <br />5.340 <br /> <br />2.490 <br /> <br />1.710 <br /> <br />890. <br /> <br />.Sno\\ mett runoff <br /> <br />8.5 Flow Comoarison - HMS Model and Flow Frequcncy Rccords. Table t-llists thc <br /> <br />rainflood peak flows at Rico and Dolorcs for the East Fork and West Fork 1% stonn centerings. <br /> <br />The 1% rain flood peak flow at Rico gage is 5.260 cfs for the East Fork ccntcring and 2.290 cfs for <br /> <br />33 <br />