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A 150-acre rural drainage area consists of three different watershed areas as follows: Steep grassed areas...

  1. A 150-acre rural drainage area consists of three different watershed areas as follows:

Steep grassed areas = 20 percent

Forested areas = 30 percent

Cultivated = 50 percent

If the time of concentration for the drainage area is 30 minutes, determine the peak runoff rate (by the rational method) for a storm of 25 yr frequency. Assume that the rainfall intensity curves in the text are applicable to this drainage area.

Engineering   Civil-Engineering   
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