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Civil Engineering Practice • Water Resources & Environmental

Runoff & the Rational Method

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Worked: both methods

  • 12 acres, C = 0.65, i = 3.2 in/hr: Q = 0.65 × 3.2 × 12 = 25 cfs.
  • CN = 80 and P = 4.0 in: S = 2.5 in, so Q = (4.0 − 0.5)²/(4.0 + 2.0) = 2.04 in of runoff.

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