Multiple choice

Directions: The ordinates of a 2-h unit hydrograph at 1 hour intervals starting from time t = 0, are 0, 3, 8, 6, 3, 2 and 0 m3/s. Use trapezoidal rule for numerical integration, if required.

A storm of 6.6 cm occurs uniformly over the catchment in 3 hours. If 0-index is equal to 2 mm/h and base flow is 5 m3/s, what is the peak flow due to the storm?

  1. 41.0 m3/s

  2. 43.4 m3/s

  3. 53.0 m3/s

  4. 56.2 m3/s

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A Correct answer