You should be able to.
Gutter and downspout dimensions.
Round 3 inches 706 square feet 4 inches 1 255 square feet.
This type of down spout is considered the standard downspout style in households and is used with a 5 k style guttering system.
Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area.
Gutter downspout sizes are 3 to 6 inches.
Most downspouts are rectangular but they can also be round or square.
The sizes available in this style are 3 4 5 and 6.
See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.
You should have enough gutter downspouts to effectively handle the size of your entire gutter system.
Rectangular 2 by 3 inches 600 square feet 3 by 4 inches 1 200 square feet.
The larger a gutter downspout the more water it can drain quickly.
The flexible design easily bends and holds its shape and can be extended from 25 in.
The gutter outlet capacity should suit the downspout capacity.
Practically speaking though a common gutter size is usually selected and downspout spacing is equal for most buildings.
How to figure the right downspout size.
The downspout size must suit.
Rainfall intensity is measured in inches per hour at a 5 minute interval.
Measure your gutter across the top from the back where the gutter meets the home to the outer edge.
Use the chart below to figure out how many extra downspouts you need.
But more could be.
The most common gutter sizes are 5 inches and 6 inches although 4 inches is available as well.
Offset of more than 10 ft 3 0 m can affect drainage capacity.
As with gutters a downspout s capacity must match or exceed the expected runoff.
One downspout is typically enough for every 20 25 feet of guttering.
5 inch standard k style gutter shop 5 gutterbrush.
Size of the gutter drainage area.
Downspouts are commonly 2 x 3 inches and 3 x 4 inches in size or 3 or 4 inches in diameter.
Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage.
Round downspouts come in various sizes and colors and mostly used with half round gutters.
Continuing with our example in the last step we know our gutter downspout system may be subject to as much as 1 880 gallons per minute.
However too large a gutter downspout can look unattractive.
