If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be
A. 1 + 0.9°10
B. 1 - 0.9°10
C. $$\frac{1}{{1 - {{0.9}^ \circ }10}}$$
D. $$\frac{1}{{1 + {{0.9}^ \circ }10}}$$
Answer: Option C
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Pn = 1-(1-P)^T
P= 10%
T= 10 years
ans. 1-0.9^10
can anyone explain ?