Green Roof Runoff Reduction Calculator

Estimate runoff retention and reduction for extensive and intensive green roof systems based on substrate depth, plant coverage, and storm event.

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

Estimate runoff retention and reduction for extensive and intensive green roof systems based on substrate depth, plant coverage, and storm event

Each component has a specific meaning:

  • Substrate depth — The substrate depth recorded for the patient or scenario being assessed.
  • Plant coverage — The plant coverage recorded for the patient or scenario being assessed.
  • Storm event — The storm event recorded for the patient or scenario being assessed.

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

How to Use

Enter the substrate depth, plant coverage, storm event for the patient or scenario you are assessing. Estimate runoff retention and reduction for extensive and intensive green roof systems based on substrate depth, plant coverage, and storm event. Use the green roof runoff result to inform your clinical assessment.

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Frequently Asked Questions