Runoff Produced Per Square Foot Of Roof

Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember.

Runoff produced per square foot of roof.

Use our metric system version. However calctool s unit menus remove this issue doing all the unit conversion for you. This nominal square footage amount is then multiplied by a factor associated with the roof s pitch. 0 gallons per minute gpm 0 cubic feet per second cfs peak runoff volume.

0 inches per hour data source. 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. Although this calculation is simple in principle the units can make it a headache. Take the dimensions of the footprint of your roof and convert them to inches.

0 gallons 0 cubic feet. Measure along the length of the house or building and along the width of the house or building in feet. Drainage pipe required minimum diameter. 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.

As an example if your overhang is 12 inches you ll add 2 feet to the overall length and 2 feet to the overall width of the house. 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. The answer is about 623 gallons. The basic calculation is a x r 231 g where a is the area of your roof in square feet r is the amount of rain in inches and g is the amount of runoff in gallons.

Measure your house at ground level then add in the roof s overhang for greater accuracy. 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. 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.

Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout. Rainfall calculator english units how much water falls during a storm. Automatic overflow control directs water back to downspout when barrel is full. Multiply the two figures together to obtain the square footage of your roof step 2 determine the percentage of water collected from each downspout p.

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. 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. Roof pitches in. Count the number of downspouts coming from your roof.

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.