rational.sdsu.edu: Calculation of peak discharge by the rational method ![](vlab_logo-60.gif)
![](rational_method_photo_250.jpg) Box culvert at highway crossing.
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| Formula:
Qp = C I A
In SI Units (metric): L s-1, mm hr-1, and hectares (ha).
In U.S. Customary Units: cfs, in hr-1, and acres (ac).
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