Question: Problem 2 The following maximum annual flows were recorded at Station A. Based on the Lognormal distribution, and using probability papers: a) Compute the 50-year

Problem 2 The following maximum annual flows were recorded at Station A. Based on the Lognormal distribution, and using probability papers: a) Compute the 50-year flood b) What is the probability that this 50-year flood will not occur in a 20-year period? c) What is the probability that flow value is less than 90 m3/s in a single year? d) If a levee is designed to control floods using the exceedance probability of 20- year flood, find the probabilities for i) The levee will not be overtopped during a 20-year period ii) The levee will be overtopped less than three times in a 20-year period. Year Q (m3/s) Year Q (m3/s) 1980 63 1985 57 1981 16 1986 30 1982 17 1987 38 1983 242 1988 21 1984 41 1989 42

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