French Drain - PVC holes up or down?


  #1  
Old 04-29-10, 12:20 PM
Z
Member
Thread Starter
Join Date: Oct 2008
Location: Desert SW & Pacific NW
Posts: 35
Received 0 Votes on 0 Posts
French Drain - PVC holes up or down?

In past French drains I've used the flexible corrugated black drain pipe. This time I'm using 4" PVC in case it needs to be snaked for cleaning someday. The black stuff had 360 degrees of holes, but the PVC holes are on one side of the pipe, more or less. I know the holes would orient down if I was building a leech field. But my drain intends to move water from above pipe depth, out of that area to a common dump point. My gut tells me to put the holes up, and then the higher water gets in easy, and rides the closed bottom of the drain pump toward the exit. But I read somewhere that the holes should go down. Of course, it will be covered with landsacpe cloth regardless. Any ideas?

Thanks,

Rich
 
  #2  
Old 04-29-10, 04:19 PM
Join Date: Mar 2005
Location: USA
Posts: 6,130
Received 0 Votes on 0 Posts
The holes definitely go on the bottom (4:00 and 8:00) with proper backfill below.

This prevents soil from above getting in and minimizes the amount of silt.

Any drain pipe should be put in a perforated sock because most backfills are not graded right. Clean rock is too coarse and silt can come through it too easily.

Dick
 
  #3  
Old 05-07-10, 08:35 AM
K
Member
Join Date: Sep 2003
Location: somewhere down in texas
Posts: 506
Received 0 Votes on 0 Posts
I consider the sock to be optional. I have been to several drainage seminars and many think that the sock will grow algae over time that will seal off the drain.
 
  #4  
Old 05-07-10, 08:49 AM
W
Member
Join Date: Feb 2006
Location: USA
Posts: 6,800
Received 36 Votes on 33 Posts
Algae

I believe algae needs sunlight to grow.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: