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. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. To calculate the runoff from any given rainfall.

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Take a guess what is the volume of water that runs off a 1 000 square foot roof during a 1 rain storm.

Gallons per square foot of roof.

Roof area square feet per linear ft of gutter underneath. Using a 10 000 sq. Code to add this calci to your website. Where rainfall rate is expressed in inches per hour and roof area is given in square feet.

1 inch of rainfall in an hour will cover 1 sq ft. 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. Sq ft safe for maximum rainfall reduce by 10 per 90 degree turn.

Rainwater can be collected from the roofs using the rain water harvesting method. 4 ft 2. 5 ft 2. Max area of roof draining to one down.

The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area. Or 0312 gallons per minute sq. The answer is about 623 gallons. Converting this to gallons per minute per square foot gpm ft 2.

Take the dimensions of the footprint of your roof and convert them to inches. 1 us gallon 231 cubic inches. Of water 231 sq in. Of water in a gallon 0 623 gallons per hour.

To a depth of 1 in 1 hour.

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