The following parameters were computed for a stream near Lincoln, Nebraska:
Period of record = 1980–1999, inclusive
Mean annual flood = 7000 cfs
Standard deviation of annual floods = 1000 cfs
Skew coefficient of annual floods = 1.0
Mean of logarithms (base 10) of annual floods = 3.52
Standard deviation of logarithms = 0.50
Coefficient of skew of logarithms = 2.0Determine the magnitude of the 25-year flood by assuming that the peaks follow a (a) log–Pearson type III distribution, (b) Gumbel distribution, and (c) lognormal distribution.
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