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rainwater-harvest

How much Rainwater can I expect to catch?

Rainwater Catchment information question. How much rainwater can you catch when rain harvesting?

In calculating what size and type of tank you need (click here for more help) for rainwater catchment, often the limiting factor is not the amount of rain we get, it’s the amount of space that is available for a rainwater tank. Saying that, we know it rains in the UK quite a bit, if you live here you will have the experience in some parts of the country it raining for days at a time.That’s a lot of rain.

When harvesting rainwater, for every inch it rains on a 1,000 square foot roof, you can collect 600 gallons of water.

So if you install a rainwater harvesting tank to the down pipe of that 1,000 square foot roof, you could collect 6,000 gallons of water with 10 inches of rain!

Even if you can’t fit a huge tank in your yard, you’ll find that our rain patterns in the UK are more than adequate for rainwater catchment. If there is drought that’s when the rainwater backup comes in (the 4800 Litre Carat just as an example) which has automated mains water back-up in case of long drought. So you use the mains when you need to saving you water and money. See below for the average rainfall just in the South of England.

Southern England Average yearly precipitation

                     Days, Places, Inches, mm

125

Birmingham

26.8

681

108

Cambridge

22.4

568

115

Eastbourne

31.3

795

122

Exeter

33.4

848

116

Ipswich

24.2

614

110

London

23.3

592

117

Lowestoft

24.4

620

155

Newquay

40.1

1017

116

Oxford

26.0

660

183

Princetown, Dartmoor Park

78.7

1998

On seeing the rainfall guide for just the south of England you will see it’s time to consider ways of saving our self water when it’s in such abundance in our country making what some people feel is a bad thing a good thing in deed.

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