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The roof on a 'typical' four bed family home captures more than 100,000 litres (100 cubic metres) of rainwater a year.
A typical family uses 70,000 litres year on toilet flushing, clothes washing, and outside use.
In the UK, the proportion of water used for gardening can approach 50% during the driest months.
Enough rainwater falls in the UK to more than meet the needs of everyone.
Rainwater Harvesting is already common in Europe – about 100,000 systems were installed during 2005/2006.
If half of the 60 million plus people living in the UK saved rainwater (e.g. half of all dwellings fitted with rainwater harvesting systems), this would save over 750 million cubic metres of treated mains water a year.