Every time we collect rainwater in water butts and containers to reuse in the garden, we’re rainwater harvesting.
If you collect and store it correctly, with minimal treatment rainwater can be used not only for garden watering, but toilet flushing and in washing machines. It could save up to 50% of household water use. But realistically, the roof areas of most houses are too small to meet all of this demand.
Industrial premises with larger roof areas offer greater opportunities and can be used for things like vehicle washing.