The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area.
Gallons per square foot of roof.
The answer is about 623 gallons.
Rainwater can be collected from the roofs using the rain water harvesting method.
Sq ft safe for maximum rainfall reduce by 10 per 90 degree turn.
Of water in a gallon 0 623 gallons per hour.
Max area of roof draining to one down.
So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.
Using a 10 000 sq.
Take the dimensions of the footprint of your roof and convert them to inches.
Or 0312 gallons per minute sq.
To calculate the runoff from any given rainfall.
To a depth of 1 in 1 hour.
Converting this to gallons per minute per square foot gpm ft 2.
Of water 231 sq in.
Roof area square feet per linear ft of gutter underneath.
Where rainfall rate is expressed in inches per hour and roof area is given in square feet.
1 us gallon 231 cubic inches.
Up to 6 12 7 12 8 12.
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.
4 ft 2.
1 inch of rainfall in an hour will cover 1 sq ft.