Rainfall-Runoff Calculators for Stormwater Management. Rational Method & SCS Curve Number Method. Estimate runoff for urban and rural watersheds

Rainfall-Runoff Calculators

Estimate runoff for your watershed with our professional calculators

Rational Method Calculator 🌧️

Estimate peak discharge for small urban watersheds

Area (Acres): Rainfall Intensity (in/hr): Runoff Coefficient (C):

SCS Curve Number Method 🌍

Estimate direct runoff based on rainfall, land use, and soil type

Rainfall (inches): Curve Number (CN):

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Disclaimer: The results provided by these calculators are estimates and should be used as a guide. Always consult a professional for accurate results.