// multi-utility computation suite · offline · instant · precise
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env.rainwater-harvesting Calculator
Estimates annual rainwater harvest potential from roof area, local rainfall, and collection efficiency, and sizes the storage tank needed to meet a given daily demand. Rainwater harvesting can offset 30–50% of total household water use in moderate-rainfall climates.
Inputs
Roof Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Annual Rainfall Mm
Reference formula or conversion factor shown for context.
Runoff Coeff
Reference formula or conversion factor shown for context.
Filter Eff
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
annual yield (m³)
The result expressed on a per-year basis.
daily average (L)
The arithmetic mean -- sum divided by count.
roof area
The computed two-dimensional surface area.
tank size recommendation (2 months)
Suggested action or value based on the computed results and applicable best-practice guidelines.
cost saving at $2/m³
The total monetary cost computed for the given inputs.