Rainfall Volume Calculator
Calculate Rainwater Collection Volume
Catchment Parameters
Roof or catchment area
Total rainfall depth
Formula
Volume = Area × Rainfall
Assumes 100% collection efficiency
Efficiency Note
Actual collection is typically 75-90% due to losses from evaporation, spillage, and first flush diversion.
About Rainwater Harvesting
Rainwater harvesting collects and stores rainwater from roofs and other surfaces for later use, reducing dependence on municipal water supplies.
- Reduces water bills
- Provides backup water supply
- Reduces stormwater runoff
Applications
- Residential rainwater harvesting
- Agricultural irrigation planning
- Commercial building water management
- Tank sizing and design
- Water conservation planning
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