Question

The return period of the $6^{th}$ rank flood magnitude out of 25 values of annual maximum flood values arranged in decreasing order is ___________years

• A. 4.33

Answer 1

The correct option is A 4.33
Weibull formula is
$P=\frac{m}{n+1}$
$\therefore T=\frac{1}{P}=\frac{n+1}{m}=\frac{25+1}{6}=4.33years$