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Table 4. 13umber of days, frequency of occurrence and ~ time of occurrence of years with mean flows greater than 50,000 cfs. n yrs n yr `k yr fr yr n yr $ yr fr yr Period record >ld >ld >ld >lOd >lOd >lOd 1914- 39 12 31 1/3.3 5 13 1/7.8.. 1958 1959- 34 2 6 1/17 2 6 1/17 1993 * n yrs =number of years of record at Cisco gauge. * n yr >ld =number of years with less than 5 days with >50,000 cfs average flow. * ~ yr >ld =percentage of years with less than 5-days with >50,000 cfs .average flow. * fr yr >ld = frequency of .years with less. than 5 days with >50-,000 cfs average flow. * n yr >lOd =number of years with less than 10-days with.>50,000-cfs. average flow. * ~ yr >lOd =percentage of years with less than 10 days-with >50,000 cfs average. flow. * fr yr >10d = frequency of years with less than 10 days with >50,000 cfs average flow. 20