Flood Frequency Analysis: Using Gumbel Distribution

In the case of small dams, diversion works & other hydraulic structures where structural failure or overtopping will not involve loss of life, it would be seldom economical to design them to withstand the probable maximum flood. A calculated risk is taken to design these structures for a flood lesser than the probable maximum flood. The Frequency Analysis helps interpret a past record of events to predict the future probabilities of occurrence. Gumbel distribution helps to predict expected flood with different return periods. The present paper discusses one such case for construction of bridge so as to minimise the risk of any kind of problem that may arise in future.