Gallons Of Water Per Square Foot Of Roof

Take the dimensions of the footprint of your roof and convert them to inches.

Gallons of water per square foot of roof.

Or 0312 gallons per minute sq. So if you have 2 500 square feet of roof available for water catchment and a single inch of rain falls one day we see that. Take a guess what is the volume of water that runs off a 1 000 square foot roof during a 1 rain storm. Multiply the cubic feet by the amount of water per cubic foot which is 7 48 gallons.

In this example you would multiply 7 48 times 600 to get 4 488 gallons of water. To figure out the square footage of a surface multiply the width x length. Using a 10 000 sq. 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. Just multiple the square footage of roof space you have available x 0 6 gallons per square foot per inch of rain and you can see how much water you can collect from each inch of rain that falls. 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. If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year.

Roof area square feet per linear ft of gutter underneath. Meaning you can capture about 62 gallons per sq ft. To calculate the runoff from any given rainfall. Primary cause for water spillage is debri in the gutter.

For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. Calculate rainwater collection in gallons rain fall inches. Up to 6 12 7 12 8 12. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.