Rain Off A Roof

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.

Rain off a roof.

For example if you have a roof that measures 1 500 square feet that equals 216 000 square inches. Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. 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. Place a piece of standard metal drip edge onto a table or between a pair of sawhorses.

If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year. 1 500 x 144 216 000 multiply those 216 000 square inches by the rainfall. 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. Roof area m2 x precipitation amount mm amount collected liters.

Take the dimensions of the footprint of your roof and convert them to inches. See more ideas about outdoor gardens backyard front yard. This is done to give the paint a better surface to adhere. Block out distractions to.

Score the surface of the drip edge with 80 grit sandpaper. For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. How to redirect rain off a roof 1. The drainage system of any roof can be located at the edge or in the middle of the roof.

So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. Rain falls upon a tin roof creating a soothing rainstorm white noise that is perfect for helping you sleep study focus or relax. 1 of rain on 1 000 sf roof will yield 623 gallons. To find how much rain you can collect in an average rain year multiply this number by the average inches 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. Rainwater collection calculation formulas and equations. The number of feet multiplied by 144 equals inches. Multiply the area of your roof by the amount of rainfall you wish to calculate for.

Oct 7 2018 explore joyce weber s board water runoff ideas on pinterest.