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cg3459 06-16-2010 02:07 PM

Retaining Wall Weeping Tile Problem
I have just finished a fairly large retaining wall project. Hopefully I can explain the wall clearly. My yard was sloping up about 4 feet over the last 20 feet. So we flattened it out, and built the wall against the back fence, with the sides wrapping around. So if you are standing in the yard near the house its as if you were standing in the center of a U.

At the back of the yard, the wall is 4 feet tall. The wall is 40 feet wide. The sides of the U that wrap back are about 15 feet long, and we left approx 10 inches of slope from the back fence to the house. So these side walls have a step down in the base to accommodate. There are steps in the middle of the wall along the back fence, so really the wall is 2 separate walls.

Anyways.... 4 inch weeping tile was placed along the back of the wall and wrapped around the sides. So there are 2 pieces of tile, each starting at the stairs and wrapping around the sidewall, coming out at the end of the wall.

Here is my problem.... I didn't think it through properly when putting the drainage pipe in, and it now exits the base of the wall around rough grade level. I'm stumped for what to do. I can't pull it up now, and once I put top soil/sod in the pipe would be underground.... My yard does continue to gradually slope downhill, so I was thinking of digging a trench and continuing the pipe until I'm able to exit at a more comfortable spot. Is that my only option??? A friend mentioned the idea of digging a "pit" at the spot where the pipe comes out of the wall, filling it with washed rock or some other solution like that but I'm not sure....

ANY ideas would be appreciated!

Oh - I live in northern Canada, its well below freezing for 5 months of the year, and in the spring we get a large amount of runoff from melting snow. If that matters at all....


Bushman 06-16-2010 04:41 PM

Trench it out or dig a french drain where it exits the wall. I would attatch solid tile from the exit point and trench it to desired location. Really depends on water run-off, rain fall, soil, and what type of wall it is. Did you back fill with stone? Another option is to drill holes in a cap and just put a cap on it and monitor the water exiting the pipe. Most of your water is going to run off the surface of the soil. You will not get huge amounts of water gushing out of the tile. The tile is there to relieve the pressure of sodden soil pushing on the wall. It will drain slowly and surely all the time but I don't think you'll notice much. Hard to say but that's my take on it.

cg3459 06-16-2010 04:51 PM

thanks Bushman - yes I did back fill with washed rock. 10 inches thick or so with filter clothe between the washed rock and the clay. I followed the install manual from the manufacturer (Rosi Stone) exactly, just really didn't think through getting the drainage pipe to daylight.

I can certainly dig a trench for 15 feet or so and that'll get the grade down to the point where I can bring it to daylight.

If I use a solid pipe for this extension as suggested can I just bury it directly in the clay and backfill with clay? Or do I need to do any sort of rock bed and backfill or anything like that?

concretemasonry 06-16-2010 06:22 PM

Solid PVC pipe is far superior to the cheap corrugated stuff and drains much faster and better. You have to make sure the grade on the line is reasonably straight and at the slope you want. Since this is residential draining to carry water and there is not heavy traffic and are not collecting water any soil is adequate.


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