To find how much rain you can collect in an average rain year multiply this number by the average inches of rain.
Rain falling on roof.
An average suburban roof of 200m 2 with such a rain fall can potentially harvest 100 000l of rainwater 200m 2 500mm 100 000l.
It isn t uncommon for an area to collect up to 350mm of rain in just one month even in rural areas.
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For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain.
So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.
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In this example 600 x 240 x 1 144 000 cubic inches of water divide by 231 to get the number of gallons because 1 gallon 231 cubic inches.
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Take the dimensions of the footprint of your roof and convert them to inches.
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If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year.