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Question
Flood of certain magnitude has a return period of 25 years. The probability of exceedance is 
,d fuf'pr ifjek.k dh ck<+ dh okilh vof/k 25 o"kZ gSA blls vf/kd gksus dh laHkkouk gS
A.
4%
B.
12%
C.
16%
D.
32%
Answer ( Option A)

4%

Solution

The probability of exceedance means that probability that flood of certain magnitude will be equalled or exceeded in a particular year during its entire design life. 
    Probability of exceedance, P = 1/T, where T is return period 
P = 1/25 = 0.04 or 4% 
∴The probability of exceedance is 4 percent. 

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