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There are around 1.3 billion cubic kilometres of water on earth. The amount never changes. It just gets continually recycled. Almost all of it is in salt oceans
and seas, which means it is poisonous to humans and of little use to us.
Sea water accounts for roughly 97% of all the worlds water. Of the remaining 3%, almost all of it is
permanently frozen, which leaves only about 0.036% as fresh usable water found in rivers and lakes, and an even smaller amount in the atmosphere
A typical person in the UK will use around 150 litres of water per day which will be made up as follows:-
Flushing WCs
Showering and bathing
Laundry and dishwashing
Carwash/garden
Drinking
Most of that does not need to be potable, which means that rainwater is ideal for most of our water usage.
Fresh, potable water which is provided by your local water authority, is becoming increasingly expensive and will continue to do so as the population grows and the demand per person
rises. Some water
authorities are projecting increases of up to 15% over the next year
So it makes sense to harvest rainwater and use it.
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