Rainwater Harvesting Yield Calculator

Calculate annual rainwater collection volume from roof area and local rainfall data. Size your cistern and estimate water bill savings from harvested rainwater.

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

Calculate annual rainwater collection volume from roof area and local rainfall data. Size your cistern and estimate water bill savings from harvested rainwater

Each component has a specific meaning:

  • Roof area — The roof area recorded for the patient or scenario being assessed.
  • Local rainfall data — The local rainfall data recorded for the patient or scenario being assessed.

Note: Interpret the rainwater yield result against the clinical thresholds and context described above.

How to Use

Enter the roof area, local rainfall data for the patient or scenario you are assessing. Calculate annual rainwater collection volume from roof area and local rainfall data. Size your cistern and estimate water bill savings from harvested rainwater. Use the rainwater yield result to inform your clinical assessment.

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Frequently Asked Questions