One of the following statements is falsea. The period after which the entire area will start contributing to runoff is called the time of concentrationb. The runoff resulting from a rain having a duration lesser than the time of concentration will be maximumc. The maximum runoff will be obtained from rain having duration equal to the time of concentrationd. The intensity of rain reduces with the increase in its duratione. B and D
Question
One of the following statements is falsea. The period after which the entire area will start contributing to runoff is called the time of concentrationb. The runoff resulting from a rain having a duration lesser than the time of concentration will be maximumc. The maximum runoff will be obtained from rain having duration equal to the time of concentrationd. The intensity of rain reduces with the increase in its duratione. B and D
Solution
The false statement among the given options is e. B and D.
Here's why:
a. True. The time of concentration is indeed the time it takes for water to flow from the most distant point in a watershed to the outlet.
b. False. The maximum runoff does not result from a rain having a duration lesser than the time of concentration. Instead, the maximum runoff is obtained when the duration of rainfall equals the time of concentration.
c. True. As mentioned in the explanation for statement b, the maximum runoff is obtained when the duration of rainfall equals the time of concentration.
d. True. The intensity of rain generally reduces with the increase in its duration. This is because the longer the duration, the more spread out the rainfall is, and thus the intensity decreases.
e. False. As explained above, statement B is false, but statement D is true. Therefore, this statement is incorrect.
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