Rainwater harvesting
Estimate captured rain using measured rainfall and collection efficiency.
How this works
One mm of rain over one m² is one liter; apply efficiency and available storage.
Example
Using the example inputs, storable collected water is 1,000 L.
- Horizontal collection area
- 100 m²
- Rainfall
- 20 mm
- Collection efficiency
- 80 %
- Available storage
- 1000 L
- Storable collected water
- 1,000 L
Scope and assumptions
User-entered rainfall scenario, not weather prediction or drinking-water safety guidance.
OpenStax mathematics reference