Drain pipe formula


Old 05-26-01, 08:43 PM
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I want to install 4 inch corrogated drain pipe to channel away the water from my downspouts. I assume there is a formula to determine the amount of corrogated pipe to install in the drainfield...but I can't find anyone that knows. Someone help me out?
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Old 05-27-01, 01:01 AM
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I'm not a plumber, but I don't think there is any specific formula for rain gutter drainage.
Depends on the local rainfall.
If you live in the Pacific Northwest, it would be one thing, and in the Southwest, completely another.
You might check with your local Building Inspector to see if they can offer any guidance.
In most places, you are not allowed to connect rain drains to a septic system or public sewer system. They have to have their own drainfield or sump pit, or drain into a storm water runoff system (street gutter), which would be separate from a sewer system.
Judgement call on your part based on the heaviest rainfall in your area, I think.
One of the pro plumbers in here may know of something different.
Good Luck!

[Edited by OldGuy on 06-09-01 at 02:33]
Old 06-08-01, 08:44 PM
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Thanks Old Guy:

I've spoken to the building inspectors, home inspectors, and several local plumbers and noone seems to have an answer. I guess i'll just scale down a simmilar drainage system I just watched installed at a local factory. I'll just try to err on the side of caution. Appreciate your comments.
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