[Shop-talk] Finding underground plastic water pipes.

[Randall]

> Anyone have any other idea? 

Ok, this is kind of screwball, but it might work: Put a buzzer or better yet
some sort of speaker playing a readily recognized noise on the pipes where
they are exposed.  The water in the pipes should carry the sound better than
the surrounding soil, so a mechanic's stethoscope or similar should let you
map out the pipes.  Maybe?

-- Randall