Gallons Of Water Per Square Foot Of Roof

So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.

Gallons of water per square foot of roof.

Roof area square feet per linear ft of gutter underneath. Up to 6 12 7 12 8 12. Roof area the 3 inch rainfall will produce 18 700 gallons in one hour at the rate of 312 gallons per minute. Meaning you can capture about 62 gallons per sq ft.

Primary cause for water spillage is debri in the gutter. Or 0312 gallons per minute sq. Using a 10 000 sq. If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year.

In this example you would multiply 7 48 times 600 to get 4 488 gallons of water. The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area. 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. The square footage of a roof is the same whether it is pitched or flat.

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. Calculate rainwater collection in gallons rain fall inches. Take a guess what is the volume of water that runs off a 1 000 square foot roof during a 1 rain storm. To calculate the runoff from any given rainfall.

For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. Take the dimensions of the footprint of your roof and convert them to inches. 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. To figure out the square footage of a surface multiply the width x length.