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Old 02-15-2011, 09:25 AM   #16
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French Drain Help Please


concretemasonry - when you say the holes are on the lower portion if I have a 30 foot retaining wall that I am going to be putting a french drain in. Would I have a 30 foot long pipe with only holes in the last four to eight feet? Is that what you mean by "The holes are on the lower portion (4:00 and 8:00)"?

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Old 02-15-2011, 09:53 AM   #17
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French Drain Help Please


No, he means use a rigid PVC pipe made for this purpose. It has holes the entire length, on the bottom sides. This makes the water drain better and has no ridges like the flexible black stuff. The added bonus is you can snake it out if needed.
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Old 02-16-2011, 07:22 AM   #18
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French Drain Help Please


When installing the pipe you turn it so holes are more or less facing down. The holes don't have to be exactly on the bottom (6 o'clock positon).

If the holes are higher up then the pipe will not collect water until the water level rises higher, to overflow from the surrounding saturated soild into the otherwise empty pipe.
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Old 02-16-2011, 08:24 AM   #19
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French Drain Help Please


right allan, water isn't going to flow directly down and magically all go to the holes if they were on the top. If they were on the top, water would have to fill around and above the drain to seep in.

The main thing is to have the bottom of the pipe be below the bottom of the footing to ensure that the water table doesn't rise to the bottom of the footing
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Old 02-16-2011, 11:09 AM   #20
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French Drain Help Please


Is this french drain actually going at the base of the footing, or just below grade a few feet?


Just for the record, we often put an inch or two of stone under any draintile that lays on already saturated soils. It merely keeps any "soupy" mud out of the pope during const. and backfill. Any stone/gravel material that will allow water to perculate through it will also allow water to perc. out of it. Meaning I've witnessed many applications where the water will drain out of the stone rather than the pipe itself, merely because of gravity.

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