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[12valve]

So my question is should any extra precautions be made going beneath a gravel driveway?  Would hate to crush that pipe or damage the outer tile.

[CountryBoyJohn]

I am a civil engineer and design highways.  The general rule of thumb is 2' of cover over the pipe, and it will be fine.  That is, 2' of properly compacted earth fill between the top of the pipe and the bottom of your pavement (gravel.)

Based on what I've seen on this forum, you will be looking at 24" to 30" of depth anyway for proper depth.  Deeper if your water table is low enough.

I would recomend, however, that you sleeve the portion under the drive with a CMP, corrugated metal pipe, in case you need to replace it later or eventually pave your drive.  This will allow you to access this space at a future date, without having to dig up your drive again.  A 20' long section of 6" pipe is about $130 at Menards.  A small price to pay for never having to dig up your drive again.

John

[Scott7m]

 

That sums it up nicely

[12valve]

thanks for the info.