What is the risk of this hydrologic design?
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A bridge has an expected life of 25 years and is designed for a flood magnitude of return period 100 years. What is the risk of this hydrologic design?
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Design life (n) = 25 years
Return Period (T) = 100 years
Risk = 1 - qn= 1 - (1 - p)n = 1 - ( 1 - (1/T) )n
Risk = 1 - (1-(1/100))25
Risk = 1 - (99/100)25