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<br />. <br /> <br />. <br /> <br />. <br /> <br /> TABLEt <br />COMPUTED PEAK DISCHARGES FROM PREVIOUS STUDIES <br /> FOR COAL CREEK IN FLORENCE, COLORADO <br />Location and Report Drainage Area 10.0%-Chanee 2.0%-Chanee 1.0%-Chanee 0.2%-Chanee <br />Date (Sq.mi.) Flood Flood Flood Flood <br /> (efs) (efs) (efs) (efs) <br />Coal Creek (1977) 18.1 3,713 7,917 10,508 20,160 <br />Coal Creek (1978) 18.1 4,850 7,850 9,000 15,000 <br />Coal Creek (1984) 18.4 3,400 6,200 7,400 .8,200 <br />Coal Creek (1989) 20.4 4,900 7,800 9,000 15,000 <br /> <br /> TABLE 2 <br />COMPUTED PEAK DISCHARGES FROM PREVIOUS STUDIES <br /> FOR OAK CREEK IN FLORENCE, COLORADO <br />Location and Report Drainage Area 1O.0%-Chanee 2.0%-Chanee 1.0%-Chanee 0.2%-Chance <br />Date (Sq.mi.) Flood Flood Flood Flood <br /> (efs) (efs) (efs) (efs) <br />Oak Creek (1977) 71.9 7,599 15,308 19,841 36,583 <br />Oak Creek (1978) 72 10,500 17,000 20,500 36,500 <br />Oak Creek (1984) 71.6 11,000 19,500 22,500 30,000 <br />Oak Creek (1989) 71.6 10,500 17,000 20,500 37,000 <br />Oak Creek (1991) 72 7,100 13,300 16,000 23,000 <br /> <br />FLOOD HISTORY <br /> <br />The majority of flood problems in the study area are caused by cloudburst-type storms over <br />the foothills to the south of Florence during the summer months of June, July, and August. These <br />high intensity, short duration rainstorms of limited areal extent result in flash floods of high peak <br />flow, short duration, and low total runoff volume. <br />Flood potential also exists from long duration rainstorms and from rapid melting of snow <br />cover in the upper drainage basins during late spring. These floods are characterized by moderate <br />peaks, large volumes, and long duration. The potential for the most severe flooding is created by the <br />combination of rapid snowmelt with long duration rainfall. <br /> <br />4 <br />