The area we are calculating here is the same as if your roof were flat.
Rain runoff from roof.
A 1 000 square foot roof can produce more than 600 gallons 2 271 2 l of runoff for every 1 of rain that falls on it.
Even though most roofs are pitched at an angle the only part that will affect the rain runoff is the actual area underneath your roof.
Convert the percentage to a decimal by dividing the percentage by 100.
Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout.
If you have heavy runoff from roof downspouts and neighboring properties redirecting or capturing runoff can provide better control.
So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.
These techniques will minimize the amount of water that accumulates or that causes erosion in the problem area.
Determine the percentage of water collected from each downspout p.
The answer is about 623 gallons.
If your downspouts are connected directly to a storm drain disconnecting them is the single most important step you can take to reduce runoff.
However there is a way that you can redirect the rain off the roof so it falls harmlessly out of the way.
Use the water that drains off your roof.
Step 2 multiply the area of your roof by the amount of rainfall you wish to calculate for.
Count the number of downspouts coming from your roof.
1 place a piece of standard metal drip edge onto a table or between a pair of sawhorses.