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Old 08-31-2018, 10:19 PM   #1
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What type of drain pipe to use near tree


Hey All,

So to close out my last thread, I decided to daylight my downspout drain pipes onto a slope rather than come up with some other method. The challenge was that a tree was in my way, but I was able to dig below the larger roots enough that I could pass a pipe (easier said than done lol)

My question is now this. I have a bunch of solid HDPE triple wall pipe that I was planning to use, but I had some concerns that the tree roots may at some point put pressure on the pipe, and wondered if I should use PVC instead (40 or 80). That said, HDPE is much more flexible and would resist cracking if the tree was to move in wind or something... it is a pretty tight fit under the roots. Not to mention routing is a lot easier with some "give"

Either way, I figured it would be a good idea to install some cleanouts on tees. Is there a best practice for a cleanout every X feet?

Pics of my progress. Sorry it's at night but we finished up late. Thanks for any advice!
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Old 08-31-2018, 10:28 PM   #2
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Re: What type of drain pipe to use near tree


HDPE > PVC for in-ground use any day. you're not going to beat the tree.
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Old 08-31-2018, 10:30 PM   #3
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Re: What type of drain pipe to use near tree


Those roots aren't moving enough to worry about but I would back fill that area all the way to the exit with a layer of gravel and cover that with a filter cloth so if the pipe were to break it still has a good path for the water to leave the yard.
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Old 08-31-2018, 11:16 PM   #4
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Re: What type of drain pipe to use near tree


How about cleanouts? Overkill or actually useful? It will probably be about 35ft of pipe all told.
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Old 08-31-2018, 11:32 PM   #5
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Re: What type of drain pipe to use near tree


Quote:
Originally Posted by giansean View Post
How about cleanouts? Overkill or actually useful? It will probably be about 35ft of pipe all told.
Over kill never hurt anybody.
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Old 09-02-2018, 10:19 AM   #6
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Re: What type of drain pipe to use near tree


Ok one more I swear...

I am trying hard to avoid the dreaded corrugated pipe... but I may have no other choice trying to snake through these roots unless I want to seriously crimp the solid pipe. I COULD conceivably get by with multiple angles like some 22.5's connected by straight pipe and screwed together (I can't find sched 35 around here, or at least easily) and put cleanouts on each end, but that sounds like a lot of work. Worst case, would a solid triple wall to corrugated buried underground be a big deal? It would probably get a little extra moist at the junction within those roots, but it is what it is.
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Old 09-02-2018, 09:34 PM   #7
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Re: What type of drain pipe to use near tree


Ok scrap that whole last part. I figured out a way using 2 x 22.5 degree elbows. Still pitches down. I will also do a PVC cleanout nearby.

So the NEW last question. I have the chance to run Sched 35 PVC to connect all these parts as I'd like to glue them. Should I still go HDPE triple wall everywhere else. Besides strength I'm not sure if glued joints while buried are better or worse for long runs. I figure there will be some movement at some point right?
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Old 09-02-2018, 10:54 PM   #8
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Re: What type of drain pipe to use near tree


welded HPDE is probably the best you'll get for durability. it's what they use for geothermal systems and those seem to have a solid lifetime.
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Old 09-02-2018, 11:39 PM   #9
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Re: What type of drain pipe to use near tree


50 years ago the whole line would have been concrete tile 12" set one in front of the other. the gravel it the main part and to pipe is just a hole in the grave.
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Old 09-03-2018, 11:19 AM   #10
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Re: What type of drain pipe to use near tree


Thank you. I had enough gravel to cover half of the first pipe (used some course sand for the rest) but that was the single. On that note, who thinks it's a bad idea to run a tri-axle filled with 18 yards of topsoil over it? It's 100% triple wall HDPE buried 4-6" in but that might be pushing it. If I put some plywood or just lumber across it would it fly?
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