Enter values to see results
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liters
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m³
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L/min
Enter values to see results
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liters
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m³
—
L/min
The Rainfall Volume Calculator converts precipitation depth measurements into actual water volumes for any catchment area. This is essential for stormwater management, flood risk assessment, and drainage system design.
1 mm of rain on 1 m² equals exactly 1 liter of water. This simple relationship scales up dramatically: 25 mm of rain on a 1,000 m² area produces 25,000 liters.
Volume = area × rainfall depth. 1 mm on 1 m² = 1 L. Flow rate = volume ÷ (duration × 60 minutes). This assumes uniform rainfall distribution over the catchment.
These volumes help design drainage systems and storage tanks. A 25 mm storm on a 1-hectare area generates 250 m³ (250,000 liters) — enough to fill 100 bathtubs.
Inputs
Results
Moderate storm event.
Inputs
Results
Major storm event.
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