Problem Statement: Estimate the magnitude of flood having a recurrence interval of 100 years by Gumbel’s method. Step-1 a. Data is arranged in descending order and calculate Ǭ and σ for the series of the noted maximum flood discharges. b. The magnitude of the flood corresponding to a given recurrence interval T may be estimated as described below Ǭ (Arithmetic mean of all the flood discharges in series) = ΣQ /n = 1843 = 1894.481 Step-2 a. For a given each value of T calculate yT by using the below equation: b. Calculate Reduced mean Ȳn and Reduced Standard deviation (Sv) using the below table: Step-3 a. For a given value of T calculate yT b. Determine the value of KT by using below equation and follow table c. Calculate flood of magnitude QT has recurrence interval T using the below equation Happy Learning! Download Excel File for Flood Frequency Analysis Download Book: Water Resource Engineering
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