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The tank size calculator is provided by
RainWaterHarvesting.co.uk for the information of their
customers and can be used to establish the size of
tank you might decide to install. You will need to know
the approximate dimensions of your house.
1. To start the calculation, click on the
Tank Size Calculator link
here and download the
Excel spreadsheet.
2. Insert your home's measurements, in metres, in the
yellow boxes. Try to estimate the dimensions of that
part of the house from which you will be collecting rain
water.
3. Refer to the table on Tab "Rainfall" and find out the
average annual rainfall in centimetres in your part of
the country, then type it in the 3rd yellow box; e.g.,
if you live in East Anglia, the driest part of the
country, use 63.
4. Insert in the red box the number of days drought
protection you would like from your rainwater harvesting
system. You can change the number of weeks at will to
see what impact it has on the tank size you need.
5. The results of the calculations are shown in the
three light blue boxes:
5.1. The first blue box shows the amount of water you
need to protect your home use and garden from drought.
5.2. The 2nd blue box shows YES if your roof is big
enough to provide the water you need to fill the tank!
5.3. The 3rd blue box shows the tank size we would
recommend.
You're done! Congratulations. Go to the product page or
search our site for underground tanks, the size you
require, and the mains backup option you prefer. Place
an order online (or by phone if you have queries) and
have the system installed. If you cannot work the
spreadsheet calculator please email us the 6 figures to
calculator@rainwaterharvesting.co.uk and we will email
you the required tank size.
If the calculator said that you need tank 6500 litres or
bigger, don't be surprised. Most suburban homes in
Britain will need this amount of water to protect
against drought for just a week or two. If you want
longer protection, then buy multiple tanks and connect
them together (a few inches from the bottom) to increase
your capacity.
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