So how many square feet of your roof will your pv solar system cover.
Runoff produced per square foot of roof.
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.
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.
0 gallons per minute gpm 0 cubic feet per second cfs peak runoff volume.
0 gallons 0 cubic feet.
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.
Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember.
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.
The answer is about 623 gallons.
Automatic overflow control directs water back to downspout when barrel is full.
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.
This nominal square footage amount is then multiplied by a factor associated with the roof s pitch.
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.
Drainage pipe required minimum diameter.
Step 1 determine the footprint of your structure f in square feet.
However calctool s unit menus remove this issue doing all the unit conversion for you.
So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.
Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout.
Count the number of downspouts coming from your roof.
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.
Roof pitches in.
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.
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.
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.
Rainfall calculator english units how much water falls during a storm.
Because of the variables pinning down exact numbers is tough.
Measure along the length of the house or building and along the width of the house or building in feet.
To calculate the runoff from any given rainfall.
