Flood Frequency Analysis, Download Excel file for Flood frequency analysis

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 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! 





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