Roof Area To Gallons

One gallon will cover 50 square feet of foam or modified bitumen roofing concrete or bonded tar and gravel roofing.

Roof area to gallons.

For all three products allow one gallon of roof coating for every 80 square feet of corrugated metal roof or 100 square feet of smooth metal roofing. Take the dimensions of the footprint of your roof and convert them to inches. To calculate the runoff from any given rainfall. 0 35 x 1 5 x 900 96 23 4 91 gpm.

To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above. A roof of 1 200 square feet in size will collect more water than one that is 600 square feet. Roof area the 3 inch rainfall will produce 18 700 gallons in one hour at the rate of 312 gallons per minute. The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area.

Highly porous concrete roofs may require more coating for proper coverage. 1 00 x 1 5 x 500 96 23 7 79 gallons per minute. Multiply across each row. The answer is about 623 gallons.

The total rainfall and how rapidly it falls will affect the runoff from the roof. An inch of rain is not much but it if falls in half an hour it could flood a gutter. Either way you would like to know how much rain has fallen how many gallons have come down from the skies onto your roof yard block or town. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water.

The runoff q for the roof area in drainage zone a is. The runoff for the grass portion of drainage zone a is. Or 0312 gallons per minute sq. Rainwater can be collected from the roofs using the rain water harvesting method.

Gutters and a downspout. 1 of rain on 1 000 sf roof will yield 623 gallons roof area m 2 x precipitation amount mm amount collected liters other water conservation calculators. Total roof area also affects runoff. Pitch or steepness also is a factor.

So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. 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. Roof area ft 2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. Rainwater collection calculator in gallons.

Converting this to gallons per minute per square foot gpm ft 2. In the form below choose an area s and a rainfall amount to see how many gallons of water fell from the sky onto that area. Notice that even though the grass area is nearly 2x that of the roof the roof runoff is nearly 2x that of the. To a depth of 1 in 1 hour.

Using a 10 000 sq. Rain barrel supplies list.