Rainwater Harvesting Sizing
Region
Roof Area Sq Meters
Gardening Usage Litres Daily
Washing Machine Usage Litres (Avg 50lt per wash) Daily
Toilet Usage Litres (Avg 6lt per flush) Daily
Other non potable use Litres Daily
Annual Demand Litres
Annual Yield Litres
Tank Capacity Litres
In accordance with BS8515:2009, calculate 5% of annual yield and demand, the tank capacity is the lesser of the two results.

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