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OT: roof downspouts into field drain tile

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Lester Thomas

07-26-2006 06:25:20




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Hi, I want to connect my roof downspouts into plastic drain tile that I will trench to run into a ditch about 800 feet away. How do I size the size of tile I need to use?

I have 1400 sq feet of roof surface that I need to connect...it is only half the house, the other half runs down the hill. There would be a run of 800 feet that I would trench the tile in with a large ditchwitch. I could give it good slope - like 1 inch for every 100 feet (could go more)....
I want to make sure it is sized to handle heavy rains and not overflow due to backing up...
Will a 4 inch work, or do I need 5 or 6 inch?
Thanks in advance!

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Mike M

07-26-2006 17:13:11




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 Re: OT: roof downspouts into field drain tile in reply to Lester Thomas, 07-26-2006 06:25:20  
Just got done paying $100.00 to get my corragated pipe for downspouts and footer drain cleaned out. They were plugged from tree roots. I'm not going to use corragated again ! Use the expensive stuff first and save money in the end. Now I think I'm going to cut down the trees instead of tearing up my pipe.



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JMS/MN

07-28-2006 18:47:15




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 Re: OT: roof downspouts into field drain tile in reply to Mike M, 07-26-2006 17:13:11  
Your corrugated tile plugged because it was perforated- you should have used non-perforated. Roots get into the little slits that are in the pipe to allow excess water to drain into the pipe. Non-perf is used to transfer water without soil water getting into the pipe. Corrugation has nothing to do with it- smooth pipe would do the same if it had holes in it. Yes- those roots really multiply with all that water available.

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Bus Driver

07-26-2006 16:20:53




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 Re: OT: roof downspouts into field drain tile in reply to Lester Thomas, 07-26-2006 06:25:20  
Smooth pipe flows better than the corrugated pipe. The smooth is also is very unlikely to clog from leaves. I have 1900 square feet of roof going into 4" smooth and it handles it easily.



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buckva

07-26-2006 11:41:52




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 Re: OT: roof downspouts in reply to Lester Thomas, 07-26-2006 06:25:20  

first off let me say that I am not a fan of gutters,down spouts, and tile for buildings. My present house and barn and a previous house and barn along with the 4000 sq ft house I built for my daughter have no gutters and no problems associated with the lack of. Your 1400 sq ft area will generate 400 to 600 gallons of runoff in a good rain storm. Now fill one 55 gallon openhead drum full dump it in the area of the existing drain, mentally increase it 10 times and ask if this is what you want to install 800' of tile to eliminate. The slope of the pipe is a concern. Will it be possible for the water from the ditch to backflow thru this pipe?

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Robhkent

07-26-2006 07:43:55




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 Re: OT: roof downspouts into field drain tile in reply to Lester Thomas, 07-26-2006 06:25:20  
Lester:

As far as sizing of the tile, I would go at least 6". That should be more that sufficient. This will carry away the water from a 2"/hr rain.

The slope at 1"/100 ft will work great also. I have laid 1500 ft of field drainage tile, with 1 ft total slope, and yes the field drains well.

Rob



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Sean Feeney 2

07-26-2006 06:53:49




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 Re: OT: roof downspouts into field drain tile in reply to Lester Thomas, 07-26-2006 06:25:20  
Put it as deep as you can when ground dries up you will see the trench line. Heavy rain? should be more like 10" of pitch per hundered feet.



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randy

07-26-2006 06:50:01




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 Re: OT: roof downspouts into field drain tile in reply to Lester Thomas, 07-26-2006 06:25:20  
I did mine with 4 inch flexable pipe it comes in a 100 foot roll . it works great in the summer and fall the only problem is in the spring of the year water lays in the grooves in the pipe and freezes layer on layer and will freeze the pipe solid .I WISH I would have used smooth drain tile RANDY



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paul

07-26-2006 07:47:42




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 Re: OT: roof downspouts into field drain tile in reply to randy, 07-26-2006 06:50:01  
You didn't place it deep enough.

--->Paul



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John S-B

07-26-2006 06:42:50




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 Re: OT: roof downspouts into field drain tile in reply to Lester Thomas, 07-26-2006 06:25:20  
Lester I use 4" for no more than two down spouts, any more and I go to 6". I have five downspouts on my house plus a curtain drain for the leach bed and a french drain to catch runoff from the yard so it does'nt run across the drive. There is a 6" tile connecting everthing in the front and one in the back. They are tied into an 8" tile in the back where they meet and it discharges 150' from the back of the house. It works good for me. If in doubt, go big. It's much easier than having to retile.

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jal-SD

07-26-2006 07:01:02




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 Re: OT: roof downspouts into field drain tile in reply to John S-B, 07-26-2006 06:42:50  
A 4" tile has an interior area of 12.571 sq in, a 6" tile has an interior area of 28.285 sq in and an 8" tile has an interior area of 50.286 sq in so a 6" will handle more than twice the volume of a 4" and an 8" will handle a little more than 4 times the volume of a 4". Its better to be safe than sorry, given the cost difference in the price of the pipe, because the cost of digging it in will be about the same. Be sure to get the slope right too, as the pitch will determine how much dirt collects in the bottom of the pipe, too slope much will leave as much as too flat of a grade. Talk to an engineer that knows how to lay sewer lines, he can give you the slope data. (My $0.02 worth. jal-SD)

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Matt from CT

07-26-2006 16:27:33




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 Don't want the slope of sewer lines! in reply to jal-SD, 07-26-2006 07:01:02  
Storm water lines, sure.

Sewers have very little slope -- too much, the water runs off and leaves the soldiers behind high and dry.

Need just enough so each flush keeps them marching along.

So sewers usually have fairly long runs with very minimal slope, then a junction where they make a big drop before beginning another long, slight grade.

And I have no idea how myself and a guy who used to run a concrete pipe business started talking in an ambulance after a call on morning about sewer system design :)

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Matt from CT

07-26-2006 16:29:35




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 Re: Don't want the slope of sewer lines! in reply to Matt from CT, 07-26-2006 16:27:33  
Never mind...just realized Jal was saying about the same thing...and I suppose for leaves and such you do want them marching along like soldiers.

Du'oh...



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John S-B

07-26-2006 13:39:54




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 Re: OT: roof downspouts into field drain tile in reply to jal-SD, 07-26-2006 07:01:02  
Yeah, that was kind of the point of my post. since you have all the numbers, what's the area for a downspout? As long as a pipe has a larger area than what comes into it, it should be adequate.



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