For an annual flood series arranged in decreasing order of magnitude, the return period for a magnitude listed at position ‘m’ in a total of ‘N’ entries, by Weibull formula is-
1
\(\rm \frac{(N + 1)}{m}\)
2
\(\rm \frac{m}{n}\)
3
\(\rm \frac{N}{m+1}\)
4
\(\rm \frac{m}{(N+1)}\)
5
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