Flood frequency analysis based on:
Correct answer: B. All of the above
- A. Flood data of past is collected and arranged in descending order
- B. All of the above
- C. Probability of occurrence of certain flood is known
- D. Ranking of observation is carried out
Explanation
Frequency analysis ranks historical flood peaks, usually from largest to smallest, and uses their rank and record length to estimate recurrence probability. Hence all listed steps are involved.
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