Put simply, rainwater harvesting is the collection and storage of rain for a variety of uses – but not for drinking.
The majority of systems are used to flush WCs, although it’s also possible to supply washing machines (the soft rain is ideal for laundry as it eliminates the need for conditioners), irrigate the garden and for other non-potable purposes.
Harvesting and reusing rainwater reduces your need for water from the mains. This minimises pressure on the conventional supply and, if your property is metered, can cut your bills. Rainwater harvesting also has a beneficial, if minor, effect on the drainage system as it holds run-off when it rains, rather than allowing it to go directly into the drains.
Owing to climate change, spells of heavy precipitation are expected to increase, so widespread harvesting and storage of rainfall could reduce the risk of local flooding. This might be a boon for some planning applications.
In most cases, the primary collection system is the roof. There are two reasons for this: firstly, there will already be a setup in place (the guttering and downpipes) that can be used to convey rainwater to a storage tank.
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