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Old 08-17-2009, 07:30 PM   #1
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4" gutter -> 3" sewer pipe


i was contemplating a redesign of my gutter system and was wondering if it would be to constricting to conduct my 4 inch gutter into a conveniently located 3 inch pipe that is buried nearby ?

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Old 08-19-2009, 08:03 AM   #2
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It might overflow in the heaviest of rain storms.

WHere does the 3 inch pipe lead to?

Do not run rain water or gutter water into a septic system or into a dry well used for household drains. Also do not run into a perimeter drain (aka French drain, weeping tile) system for the house unless you have a sump pump and need/want that to help get rid of the water.

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Last edited by AllanJ; 08-19-2009 at 08:07 AM.
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Old 08-19-2009, 11:48 AM   #3
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I don't think you'll have a problem. A 4" gutter doesn't empty into a 4" round downspout; the outlet on a 4" gutter is likely a 2"x3" oval (6 sq in) at best. A 3" round PVC will be 9.4 sq in. If it overflows, then think about replacing the 3" but I doubt it will.
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Old 08-22-2009, 09:05 PM   #4
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It really depends on how much square footage of roof your draining into that 4" gutter. But unless it's a really big area draining into that gutter, I would imagine a 3" drainage pipe would be fine.

I have a modest sized ranch home (approz 1200 square feet) and my rear downspout drains into a 3" pipe. The pipe steps up to 4" where my front downspot ties into it. No problems with the volume.
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Old 08-22-2009, 09:48 PM   #5
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Should be fine. There are adapters made to do this.

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