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<br />I <br />n <br />o <br />o <br />[ <br />o <br />IJ <br /> <br />IJ <br /> <br />[ <br />IJ <br />o <br /> <br />I] <br />[] <br />I] <br /> <br />D <br /> <br />~ <br />D <br />U <br />o <br /> <br />. <br /> <br /> <br />COAL CREEK FLOODPLAIN INFORMATION REPORT <br />CRESTED BUTTE, COLORADO <br /> <br />1 <br /> <br />www.searbrown.com <br /> <br />A 1976 Floodplain Information Report prepared for Coal Creek in <br />Crested Butte was based on information garnered from a regional <br />hydrologic analysis. This study predicted a 100-year snowmelt <br />runoff of 480 cfs and a 500-year snowmelt runoff of 600 cfs for the <br />21 square-mile area. Coal Creek experienced snowmelt runoff <br />equi valent to the 500-year snowmelt in both 1978 and 1979. <br /> <br />A comparison of the Coal Creek Basin to the North Fork of the <br />Gunnison River, which is hydro-logically similar to Coal Creek, <br />clearly showed that the 1976 hydrologic analysis predictions were too <br />low. A new hydrologic analysis was completed using three <br />independent methods. As a result, a revised 100-year snowmelt <br />runoff of 805 cfs was selected for the Floodplain Information <br />update. <br /> <br />Twelve vehicle and pedestrian bridges cross Coal Creek as it winds <br />its way through the Town of Crested Butte. Fifty new cross- <br />sections of Coal Creek were laid out and survey information was <br />gathered for a new hydraulic analysis. <br /> <br />Sear-Brown performed the new analysis using the HEC-2 computer <br />program in order to analyze the four flow splits and define the 100- <br />year floodplain. A floodway delineation was made on the lower <br />reach of Coal Creek through Crested Butte since this portion of the <br />river was experiencing rapid residential growth. <br /> <br />CLIENT NAME <br />Town of Crested Butte, Colorado <br /> <br />REFERENCE <br />Bob Gilly <br />970-349-5338 <br /> <br />PROJECT COST <br />$15,000.00 <br /> <br />COMPLETION DATE <br />1992 <br /> <br /> <br />.THE SEAR-BROWN GROUP <br />