The 20-year record of annual flood peaks on Furr’s Run are as follows:
Year | Q (cfs) |
1951 | 1060 |
1952 | 2820 |
1953 | 1970 |
1954 | 1760 |
1955 | 1650 |
1956 | 1140 |
1957 | 1020 |
1958 | 2260 |
1959 | 1650 |
1960 | 870 |
1961 | 1350 |
1962 | 1140 |
1963 | 2100 |
1964 | 1090 |
1965 | 2890 |
1966 | 1100 |
1967 | 1840 |
1968 | 1710 |
1969 | 1630 |
1970 | 1260 |
Log the values of peak discharge and compute the mean, standard deviation, and skewness coefficient. Plot the data on lognormal probability paper. With the aid of Table B.2, fit both the lognormal and log-Pearson III distributions. Compare estimates of the 50- and 100-year events.
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