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Disaster and Its types

The hydrologi...

Question

The hydrologic risk of a 100-year flood occurring during the 2-year service life of a project is

A

9.8%

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B

9.9%

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C

19.9%

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D

1.99%

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Solution

The correct option is D 1.99%
The risk is given by,
$R = 1 - {(1 - \frac{1}{T})}^{n} = 1 - {(1 - \frac{1}{100})}^{2}$
$= 0.0199 = 1.99 %$

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