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how to locate french drain pipe

Posted on 1/1/23 at 5:41 pm
Posted by Bayou
CenLA
Member since Feb 2005
36925 posts
Posted on 1/1/23 at 5:41 pm
I'm looking to put up a fence with limited space. That liimited space has a 4" corrugated french drain pipe running parallel through that space (at property border).
The french drain is vital for back yard drainage and I can't afford to wreck that. We plan to use an auger for post holes.
Is there an instrument to locate this?
Posted by Zappas Stache
Utility Muffin Research Kitchen
Member since Apr 2009
38790 posts
Posted on 1/1/23 at 6:36 pm to
The pipe will plastic but more importantly it will be in a gravel field wrapped in geotextile and you don't want to damage the geotextile. See pic. I think you will need to hand dig gently to find the geotextile/gravel and stay out of that area. Normally with a plastic pipe you could use a metal probe to find it but that would damage the geotextile in your case.

Posted by baseballmind1212
Missouri City
Member since Feb 2011
3265 posts
Posted on 1/1/23 at 7:05 pm to
You would have to put a tracer wire thru the pipe, then use a low voltage tracing tool to put a small amount of voltage on the line and then spot it.

Most plumbers can do this.

It may be cheaper to pothole along your French drain every 5 to 10 feet to find it instead.
Posted by trident
Member since Jul 2007
4759 posts
Posted on 1/1/23 at 7:42 pm to
Take long thin piece of metal and poke to find the pipe. Start at your catch basin and work from there. Flag where the pipe is
Posted by Milescb28
New Orleans
Member since Oct 2008
197 posts
Posted on 1/2/23 at 8:10 pm to
Steel probe rod. Any plumbing supply place will have one. They are inexpensive.
This post was edited on 1/3/23 at 7:48 pm
Posted by Cracker
in a box
Member since Nov 2009
17770 posts
Posted on 1/2/23 at 9:49 pm to
They rent a tool you can use for this
Posted by PaBon
UPT 17th W/D
Member since Sep 2014
1891 posts
Posted on 1/2/23 at 9:58 pm to
Everyone’s correct, metal probe rod.
Posted by Bayou
CenLA
Member since Feb 2005
36925 posts
Posted on 1/3/23 at 9:22 am to
quote:

They rent a tool you can use for this

What's it called?
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