640 litres
8.0 bathtubs of water
1mm of rain on 1 sq m = 1 litre. 80% collection efficiency for typical roofs. Average UK rainfall: 885mm/year.
1mm of rain on 1 sq m = 1 litre. 80% collection efficiency for typical roofs. Average UK rainfall: 885mm/year.
Useful Tools
Casio Scientific Calculator
Essential for quick calculations
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