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Old 04-10-2008, 12:06 AM   #1
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installing gutter drain pipes

In two weeks I plan to begin trenching for gutter drains. Just had a few Qs

I'm dealing with 1700sqft of water displacement from my house. I'm doing it in two runs, half the gutters for each pipe.

Now as they meet, should I just run two pipes side-by-side to the exit, or can I "Y" them together? I'm in Ohio, we don't get huge rains very often, but sometimes.

I'll be using the standard s30 4" pipe unless anyone has a better idea?

Any idea about depth? I'm thinking just a foot or two?


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Old 04-10-2008, 04:08 PM   #2
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I did this last year. I also live in Ohio (NE). Lots of work, but worth it. I did one 4" drain for each downspout with one exception. That one is two downspouts into a single 4'' drain, the second one "y'd" about 15 feet downstream. Every thing drains fine. By my calculations my two 2"x3" downspouts carry just a little less water than the 4" round pipe., assuming maximum flow. Just calculating the combined area. Using that method, a 4" pipe could not handle more than two downspouts, assuming the maximum flow.
Hope that makes some sense and helps.


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Old 04-14-2008, 10:33 PM   #3
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hmmm well I read somewhere a 4" pipe can pass something like 2000gpm at standard pressure, and that it was more than enough to handle upto a few thousand square foot of roof area... one 4" pipe.

I mean it makes sense, when I drive down the road I see only one 4" pipe in the ditch
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