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<br />I. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br /> <br />Table 1-1. Area-Discharge Data for Dolores River and Similar Basins <br /> Area (A) Peak Discharge, Q (cfs) <br />Location (sq mi) lOO-year Q/A 500- year Q/A Q,ooIQulO <br />Lost Canyon Creek 72 2,500 35 4,500 63 1.8 <br />at Dolores <br />Dolores River above 270 7,500 28 20,000 74 2.7 <br />West Dolores River <br />Dolores River 567 14,500 26 36,000 63 2.5 <br />at Dolores <br />Mancos River 83 2,750 33 4,420 53 1.6 <br />at Mancos <br />Chicken Creek 22 950 43 1,370 62 1.4 <br />at Mancos <br />Junction Creek 39 4,350 112 7,700 197 1.8 <br />at Durango <br />Sources: references 5, 6 and 7 <br /> <br />large areas of shale which has a very small runoff storage capacity. <br /> <br />Peak Discharges <br /> <br />Table 1-2 shows the lOO-year and 500-year discharges used in this study along with the <br />. results of the frequency analysis for the Dolores River below Rico. The l00-year peak <br />discharge for the Dolores River at Rico was based on the results of the frequency <br />analysis with adjustments made based on area-discharge ratios and knowledge of <br />unrecorded historic floods. Peak discharges for Silver Creek and the SOO-year flood <br />discharge for the Dolores River were determined primarily by comparisons with other <br />drainage basins and known high-water elevations from historic floods. <br /> <br />3 <br />