Multiple choice

While applying the Rational formula for computing the design discharge, the rainfall duration is stipulated as the time of concentration because

  1. this leads to the largest possible rainfall intensity

  2. this leads to the smallest possible rainfall intensity

  3. the time of concentration is the smallest rainfall duration for which the Rational formula is applicable

  4. the time of concentration is the largest rainfall duration for which the Rational formula is applicable
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A Correct answer
Explanation

 Time of concentration $(t_c)$ is the time when entire catchment starts contributing to surface run-off at channel and this is the minimum time required. so, smallest rainfall duration for which the rational formula is applicable.

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