Average, a flood of this magnitude is expected to occur once every 100 years. Therefore, option D. 100 year is correct.
The recurrence interval of a flood can be calculated using the following formula:
Recurrence Interval = 1 / Probability
Given that the annual probability of a flood is 1%, we can calculate the recurrence interval:
Recurrence Interval = 1 / 0.01 = 100 years
Therefore, with an annual probability of 1%, the recurrence interval of the flood is 100 years. This means that, on average, a flood of this magnitude is expected to occur once every 100 years.
Question
Suppose the annual probability of a flood is 1%. What is the flood's recurrence interval?
choose one
A. 20 year
B. 65 year
C. 87 year
D. 100 year