Runoff Coefficient Calculator

Determine runoff coefficient C for Rational method based on land use: commercial 0.70-0.95, residential (1/4 acre) 0.30-0.50, grass lawns 0.10-0.35, impervious paving 0.70-0.95. Composite C for mixed areas.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)
σy — Normal Stress Y (MPa)
τxy — Shear Stress (MPa)
⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.
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How It Works

Determine runoff coefficient C for Rational method based on land use: commercial 0.70-0.95, residential (1/4 acre) 0.30-0.50, grass lawns 0.10-0.35, impervious paving 0.70-0.95. Composite C for mixed areas

Each component has a specific meaning:

  • Land use: commercial 0 — The land use: commercial 0 recorded for the patient or scenario being assessed.

Note: Interpret the runoff coefficient result against the clinical thresholds and context described above.

How to Use

Enter the land use: commercial 0 for the patient or scenario you are assessing. Determine runoff coefficient C for Rational method based on land use: commercial 0.70-0.95, residential (1/4 acre) 0.30-0.50, grass lawns 0.10-0.35, impervious paving 0.70-0.95. Composite C for mixed areas. Use the runoff coefficient result to inform your clinical assessment.

Frequently Asked Questions