Take the dimensions of the footprint of your roof and convert them to inches.
Rain off a roof.
Multiply the area of your roof by the amount of rainfall you wish to calculate for.
Rainwater collection calculation formulas and equations.
Block out distractions to.
Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember.
Designing a flat roof for runoff how water runs off a roof depends on the amount of rainfall and how quickly it needs to drain.
You have to admit that whether you re in a drought situation or not it s hard to pass up that much of a free thing.
If you get about 10 inches of rain over the course of the spring and summer an average 1 360 square foot roof would yield 8 160 gallons of rainwater.
Place a piece of standard metal drip edge onto a table or between a pair of sawhorses.
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How to redirect rain off a roof 1.
This is done to give the paint a better surface to adhere.
Roof area m2 x precipitation amount mm amount collected liters.
1 of rain on 1 000 sf roof will yield 623 gallons.
Oct 7 2018 explore joyce weber s board water runoff ideas on pinterest.
Score the surface of the drip edge with 80 grit sandpaper.
If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year.
A common slope used that covers most materials is 2 12 which means that for every foot the roof steps up or down 2 inches.
Turn it upside down so the.
For example if you have a roof that measures 1 500 square feet that equals 216 000 square inches.
The drainage system of any roof can be located at the edge or in the middle of the roof.
To find how much rain you can collect in an average rain year multiply this number by the average inches of rain.
So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.
Paint the drip edge.
The number of feet multiplied by 144 equals inches.
For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain.