Runoff Produced Per Square Foot Of Roof

Drainage pipe required minimum diameter.

Runoff produced per square foot of roof.

If you get about 10 inches of rain over the course of the spring and summer an average 1 360 square foot roof would yield 8 160 gallons of rainwater. 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. 1 of rain on 1 000 sf roof will yield 623 gallons roof area m2 x precipitation amount mm amount collected liters other water conservation calculators. Use our metric system version.

To calculate the runoff from any given rainfall. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. 0 inches per hour data source. To work out the surface area simply multiply the length in metres by width for square or rectangular roofs.

1 500 x 144 216 000 multiply those 216 000 square inches by the rainfall. You have to admit that whether you re in a drought situation or not it s hard to pass up that much of a free thing. Rainfall calculator english units how much water falls during a storm. But at 20 watts per square foot a system rated to produce 2 kilowatts would cover roughly 150 square feet while a 3kw system would take up about 225 square feet.

The answer is about 623 gallons. Calculate surface area of your roof. 216 000 square inches multiplied by 2 inches of rain yields 432 000 cubic inches of rain. In this example we ll assume 2 inches of rain per hour.

Here you can easily find how much rainwater you can collect from you roof how much you need to remove from a courtyard or how much runoff you can expect from an area of land. Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. Automatic overflow control directs water back to downspout when barrel is full. However calctool s unit menus remove this issue doing all the unit conversion for you.

0 gallons 0 cubic feet. Since rainwater is collected from rooftops you will need to work out the total surface area of roof s that will be used to catch rainwater. For example if you have a roof that measures 1 500 square feet that equals 216 000 square inches. Take the dimensions of the footprint of your roof and convert them to inches.

Because of the variables pinning down exact numbers is tough. So how many square feet of your roof will your pv solar system cover. It is the middle of july in georgia and both you and your tomatoes are wilting in your yard both looking to the sky and hoping for rain. Although this calculation is simple in principle the units can make it a headache.

Determine the footprint of your structure f in square feet. Multiply the two figures together to obtain the square footage of your roof.