Driveway Runoff Calculator
Calculate rainwater runoff volume from your driveway or paved surface. Estimate drainage requirements and environmental impact for proper water management.
Step 1: Surface Details
Understanding Runoff Coefficients
Runoff coefficient (C) represents the fraction of rainfall that becomes surface runoff. Impervious surfaces like asphalt have higher coefficients (0.8-0.95) while permeable surfaces have lower values (0.05-0.35).
Step 2: Rainfall Details
Runoff Calculation Formula
Runoff Volume = Area × Rainfall Depth × Runoff Coefficient. This simplified Rational Method helps estimate peak runoff rates for small drainage areas. Actual runoff may vary based on slope, soil type, and antecedent moisture.
Driveway Runoff Calculation Results
Estimated Runoff Volume from Your Driveway
Surface Type Runoff Comparison
| Surface Type | Runoff Coefficient | Runoff Volume | Infiltration Rate | Environmental Impact |
|---|
Rainfall-Runoff Analysis
Runoff Calculation Formula
Q = C × I × A
Where: Q = Runoff volume, C = Runoff coefficient, I = Rainfall intensity, A = Area. The Rational Method is commonly used for small drainage areas to estimate peak runoff rates for stormwater management design.
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