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How many years of minimum rainfall is required to design hydroelectric projects?

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How many years of minimum rainfall is required to design hydroelectric projects?

(a) 10

(b) 20

(c) 25

(d) 35

I had been asked this question during a job interview.

Origin of the question is Rainfall and its Measurement topic in division Hydro Electric Power Plant of Energy Engineering

1 Answer

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Best answer
Right option is (d) 35

Easiest explanation: In the design of hydro-electric projects, the rainfall record of nearly 35 years is required. This period is accepted as giving a reasonably accurate assessment of mean annual rainfall. Many times, it is not possible to wait many years for rainfall data and in such cases, shorter periods are accepted by design engineers with reserve and allowance is made for possible error.

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