Question

For predicting floods of a given frequency the best reliable method is

Answer 1

heya..

The best method for calculating the chance of different sized floods occurring is statistical

analysis of long-term flood records
from stream gauging stations.

Where a long-term flood record exists, and no significant


changes have occurred to the catchment, a statistical technique known as flood frequency analysis can be used to determine the likelihood of floods of different sizes occurring at a specific site in the future 


hope helped..