Peak Runoff Using the Rational Method
Mediumrational methodrunoff
Using the rational method Q = 0.278CIA, estimate peak runoff for C = 0.60, rainfall intensity I = 50 mm/hr, and drainage area A = 2 km2.
- A8.34 m³/s
- B16.68 m³/s
- C27.8 m³/s
- D33.4 m³/s
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Answer: B. 16.68 m³/s
Substitute into the supplied SI form: Q = 0.278(0.60)(50)(2) = 16.68 m³/s. The coefficient 0.278 converts the stated units.
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