Gallons Per Square Foot Of Roof

Example roof and and design.

Gallons per square foot of roof.

For example a 3 inch per hour rainfall will build up to a 3 inch depth on a flat roof in one hour at the rate of 1 87 gallons per hour sq. However a good starting point in my experience is 1 gallon of roof mix covers 100 sq. It is often compared to slope but is not exactly the same. For instance if the pool is 3 feet deep 10 feet wide and 20 feet long you would multiply 3 times the product of 10 times 20 to get 600 cubic feet.

Use one gallon for every 50 square feet of bonded tar and gravel roof and for every 50 to 75 square feet of rolled roofing. 12 depth a basin or dry stream bed that is approximately 6 feet by 6 feet or a dry stream bed that is 3 feet wide x 11 feet long. 6 depth double. 400 square foot roof draining to 1 raingutter downspout.

The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area. With a cedar roof make sure you pre wet the roof down with water first. For instance an l shaped surface can be broken into 2 smaller rectangles see illustration below. Roof area the 3 inch rainfall will produce 18 700 gallons in one hour at the rate of 312 gallons per minute.

The answer is about 623 gallons. Gallon to square feet calculator. Code to add this calci to your website. Take a guess what is the volume of water that runs off a 1 000 square foot roof during a 1 rain storm.

For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. At 12 of depth or 66 sq. Take the dimensions of the footprint of your roof and convert them to inches. Rainwater can be collected from the roofs using the rain water harvesting method.

I am referencing the square footage of the roof with pitch factored in not the floorplan square footage. 400 sq foot roof x 62 248 gallons. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. To calculate the runoff from any given rainfall.

What about non rectangular areas. Or 0312 gallons per minute sq. In those instances you need to break the area down into smaller rectangles. Using a 10 000 sq.

So a 50 x 20 roof is 600. Conversion between gallon and square feet. So with a 5 000 sq. How do i calculate square footage.

Outside of the u s a degree angle is typically used. 248 7 48 33 sq. Step 3 multiply the cubic feet by the amount of water per cubic foot which is 7 48 gallons.