Question

For the estimation of a flood with a return period of T years by Gumbels method which of
the following sets of data regarding annual flood series would be required
A) Mean and Standard Deviation of the flood flow series
B) Mean, Standard Deviation of flood flow series and length of record
C) Mean, Standard Deviation and Coefficient of Skew of the flood flow series
D) Mean, standard deviation and return period​

Answer 1

Answer:

Your answer in the attachment.

Explanation:

Hope it may help you..

Answer 2

A correct answer is an option (B) Mean, Standard Deviation of flood flow series, and length of the record

Explanation:

The general principle of frequency analysis can be stated below:

As a simple method, the frequencies (or probabilities) of the observed flood peaks, P(X x) can be calculated. The probability curve versus the flood peaks (f versus x) is then plotted on log-probability paper and a smoothed curve is applied covering all points. By extrapolating the curve, extreme values can be obtained.

The Gumbel method of frequency analysis is established on severe value distributions & uses frequency factors expanded for the theoretical distribution. The strategy uses the given common equation for hydroelectric frequency analysis.