1 Inch Of Rain Fall On A 1200sq Foot Roof

So how can you do the math for your own roof.

1 inch of rain fall on a 1200sq foot roof.

That s 600 less gallons you have to pay for and use from your town water supply. To find how much rain you can collect in an average rain year multiply this number by the average inches of rain. The pitch of the roof is the rise over a 12 inch run. The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet.

Multiplying that number by the local maximum rainfall intensity 6 8 inches per hour yields an adjusted. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water. An inch of rain is not much but it if falls in half an hour it could flood a gutter. 6 inch 3 840 square feet.

Take the dimensions of the footprint of your roof and convert them to inches. To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above. For example a 4 12 pitch roof that is 100 square feet. A roof of 1 200 square feet in size will collect more water than one that is 600 square feet.

Multiply the area of your roof by the amount of rainfall you wish to calculate for. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. When you look at the numbers it s surprising how much water you can collect every time it rains. The total rainfall and how rapidly it falls will affect the runoff from the roof.

Rainfall calculator english units how much water falls during a storm. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. Use our roof pitch calculator to find the pitch of your roof. Roof pitch area multipliers.

For example if you have a roof that measures 1 500 square feet that equals 216 000 square inches. For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. Use our metric system version. If you have 1 000 square feet of roof on your house and it rains just 1 inch you can collect 600 gallons of water to be used in your garden for washing your car or just for drop irrigation around your property.

1 500 x 144 216 000 multiply those 216 000 square inches by the rainfall. If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year. A house in chicago has a roof whose actual drainage area is 1 000 square feet. In this example 600 x 240 x 1 144 000 cubic inches of water divide by 231 to get the number of gallons because 1 gallon 231 cubic inches.

A roof that is 50 feet long by 20 feet wide for 34 inches of rainfall in a. 100 1 054 105 4ft 2. 5 inch 2 500 square feet. Rain barrel supplies list.

Pitch or steepness also is a factor. Total roof area also affects runoff.