Question

An annual flood series contains 100 years of flood data. For a return period of 200 years, the Gumbel's reduced variate can be taken as __________ .

• A. 5.3

Answer 1

The correct option is A 5.3
$T=200years$
$y_T=\text{Reduced variate}$

$=-lnln\left(\frac{T}{T-1}\right)=-lnln\left(\frac{200}{200-1}\right)$

$y_T=5.296\simeq 5.3$