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<br />Since historical flood information on Salt Creek and Sixmile <br />is very limited, the magnitude of the 100-year flood for <br />streams was determined by a regional flow frequency, analysis <br />which peak frequency curves were developed. <br /> <br />Creek <br />these <br />from <br /> <br />Peak discharge-drainage area relationships for the Arkansas River, <br />St. Charles River, Fountain Creek, Sixmile Creek, Salt Creek, wild <br />Horse-Dry Creek, Dry Creek, and Goodnight Arroyo are shown in <br />Table 1. <br /> <br />TABLE 1 - SUMMARY OF DISCHARGES <br /> <br />FLOODING SOURCE <br />AND LOCATION <br /> <br />DRAINAGE AREA <br />(SQ MILES) <br /> <br />PEAK DISCHARGE <br />(cubic feet per second) <br />100-YEAR <br /> <br />St. Charles River <br />At the confluence <br />with Greenhorn <br />River <br /> <br />421 <br /> <br />42,600 <br /> <br />At river <br />mouth <br /> <br />482 <br /> <br />58,000 <br /> <br />Salt Creek <br /> <br />N/A <br /> <br />9,182 <br /> <br />Sixmile Creek <br /> <br />N/A <br /> <br />19,319 <br /> <br />wild Horse-Dry Creek <br />D. & R.G.W. <br />Railroad Bridge <br /> <br />82.8 <br /> <br />19,600 <br /> <br />.75 mile below <br />U.S. Highway 50 <br /> <br />69.6 <br /> <br />19,000 <br /> <br />Dry Creek <br />At the mouth <br /> <br />5.4 <br /> <br />2,900 <br /> <br />About .10 mile <br />upstream of U.S. <br />Highway 50 Bypass <br /> <br />4.1 <br /> <br />2,150 <br /> <br />Goodnight Arroyo <br />At the mouth <br /> <br />5.9 <br /> <br />3,100 <br /> <br />.40 mile upstream <br />of Red Creek Road <br /> <br />5.1 <br /> <br />3,000 <br /> <br />9 <br />