Rain Off A Roof

This is done to give the paint a better surface to adhere.

Rain off a roof.

To find how much rain you can collect in an average rain year multiply this number by the average inches of rain. 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. Turn it upside down so the. 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.

1 500 x 144 216 000 multiply those 216 000 square inches by the rainfall. If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year. Multiply the area of your roof by the amount of rainfall you wish to calculate for. Take the dimensions of the footprint of your roof and convert them to inches.

See more ideas about outdoor gardens backyard front yard. Roof area m2 x precipitation amount mm amount collected liters. Paint the drip edge. Block out distractions to.

Oct 7 2018 explore joyce weber s board water runoff ideas on pinterest. 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. Place a piece of standard metal drip edge onto a table or between a pair of sawhorses. 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.

Score the surface of the drip edge with 80 grit sandpaper. 1 of rain on 1 000 sf roof will yield 623 gallons. Rainwater collection calculation formulas and equations. For example if you have a roof that measures 1 500 square feet that equals 216 000 square inches.

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. 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. How to redirect rain off a roof 1.

Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember.