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View Full Version : Retaining wall drainage ques.


sven1277
02-18-2009, 02:33 PM
Would you ever run a down spout into the drainage pipe behind a wall and daylight at the end?

Generally, I would never do this but the situation is this. Retaining wall proposed to run down left side of driveway off house foundation. Driveway slopes down from house and pitches to the right, opposite the wall side. There are 2 down spouts that exit on driveway where the wall is to start. Often, runoff water crosses the drive and freezes at night. I recommended cutting the driveway and burying drainage pipe, then patching the drive. The driveway is a couple years old and the homeowner isn't keen on the patch. I don't blame them. I wish the paving company that did the drive had a little forthought to bury the pipe during the job.

soopa
02-18-2009, 03:06 PM
Would you ever run a down spout into the drainage pipe behind a wall and daylight at the end?

Generally, I would never do this but the situation is this. Retaining wall proposed to run down left side of driveway off house foundation. Driveway slopes down from house and pitches to the right, opposite the wall side. There are 2 down spouts that exit on driveway where the wall is to start. Often, runoff water crosses the drive and freezes at night. I recommended cutting the driveway and burying drainage pipe, then patching the drive. The driveway is a couple years old and the homeowner isn't keen on the patch. I don't blame them. I wish the paving company that did the drive had a little forthought to bury the pipe during the job.

You want to drain a down spout into a perforated pipe behind your wall? Please don't.

Bru75
02-18-2009, 04:51 PM
Yeah, run the water anywhere else - never behind your wall. You could run the downspout in a seperate solid pipe behind the wall, but that would make me uneasy too.

limaint
02-18-2009, 04:55 PM
Run it in its own pipe away from wall...

BrandonV
02-18-2009, 05:39 PM
Run it in its own pipe away from wall...

ditto or get someone to bore under the drive if possible and continue on with your original plan.

LB1234
02-18-2009, 05:56 PM
Use solid SCH40 PVC pipe. I woudn't worry one bit IF the only purpose of this pipe was the downspout with nothing else connected to it.

Isobel
02-18-2009, 06:17 PM
I wouldn't run the downspout into a perf pipe. if you had no other place I would put a solid pipe in behind the wall to carry that water--but only if the exit point was guaranteed not to backup into the perf pipe for the wall drain.

PlatinumLandCon
02-18-2009, 07:39 PM
I've run solid pipes above the perf pipe before if a downspout has no where to go. MAKE SURE the solid pipe is water tight until its in front of the wall face, otherwise you got major issues. Thats quite a bit of water behind the wall if it leaks out.

sven1277
02-18-2009, 10:35 PM
Thanks for the replies. Running a second pipe might be an option if they really don't want the water across the drive.

Dreams To Designs
02-19-2009, 09:49 AM
What surface is the driveway? Can you cut a trench, and repair with a paver or brick strip, to add interest and have a reason for the patch. Maybe add an apron and/or a border course.

Definitely don't run the down spout into the wall drain, but an additional, solid pipe added in the stone backfill should not present a problem. Run it as far away from the wall as is practical, if going to daylight. You should also consider running the downspout down on to a catch basin, before entering the pipe behind the wall or under the driveway. The grate will screen any large debris that comes off the room, but the basin section will catch most smaller material. A basin also gives you an access point for maintenance and monitoring.

Kirk

sven1277
02-19-2009, 11:56 AM
Those are good suggestions. The customer is already stretching their budget on this property and already have the nicest house in the neigbhood. The cut would be close to the garage. If the budget was there, then using pavers from the cut up to the garage would be a good solution. The drain box is also a good thought. I will present this as an economical solution to the problem. Thanks for the replies.