On Sun, 13 Mar 2011 11:58:07 -0400, "Alt.Home.Repair"
wrote:

I'm going to install plastic piping to route the water from the gutter down
spouts out to the street, to stop errosion problems.

How deep do I need to bury these pipes? I live on Long Island in NY so we do
freeze in the winter. Do I need to get below the frost line?

After agreeing with aem, I had some second thoughts. If you go
from 4-6" gutters to an underground 'pipe' that is 12-15", then you
just need to bury it deep enough to pitch off towards the street. [you
need to check local ordinances to see if you can do that-- and if you
can dig over 1' deep on your lawn without a permit and survey]

I have one of those 20' long at the end of one of my garage gutters &
it has worked fine for 10yrs or so. I'm a few hours north of you.

That's the *only* way I'd try to divert gutters underground.

Jim