Stormwater Peak Runoff Flow Rate (Q = CiA Rational Method) Calculator (Runoff Coeff C = 0.28)
Precision calculator for drainage basins with a runoff coefficient C = 0.28. Calculate real-time metrics with formulas, automatic units handling, and instant results.
Formula & Calculation Logic
Peak Discharge Q (cfs) = C × i × A
Inputs used by this tool
Enter values in the interactive controls when the page loads. The result depends on the assumptions and units shown for each field.
Input type: number
Input type: number
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