PVC buried under concrete

I would lay the pipe on a bed of sand, cover with sand compact it all, then pour concrete. Assuming you are going to be driving over this, going to need a firm compacted base. And I would consider using SCH 80 pipe for the driveway section if you can find it local. It has a thicker wall, and less apt to crush or flex.

How far under the gravel should the pipe be?

acali said:

How far under the gravel should the pipe be?

Click to expand...

I would shoot for about 4-6" between the top of pipe and bottom of trough.

Yodaman said:

I would shoot for about 4-6" between the top of pipe and bottom of trough.

Click to expand...

I don't know why I'm still surprised when every project ends up needing way more work than planned.
Thank you.

Why not just use the trough as the drain. Let the down spout flow into the end of the trough. Run through and out the other end.

Yodaman said:

Why not just use the trough as the drain. Let the down spout flow into the end of the trough. Run through and out the other end.

Click to expand...

I haven't ruled this out.
The difficulties are:
The downspout pipe will run under concrete on my patio for about 7 feet.
It will intersect the chanel drain about a foot from the end at 90 degrees.

I can get a T section and connect the pipe to that.
Potential problems are the available connecting piece to the chanel drain is more of an outlet than an inlet and sits below the drain a bit. Also would look less clean with this configuration.
And the pipe through the patio might be shallow and not sufficiently under the concrete.

How much concrete would need to be above the patio pipe run? Just foot traffic there.

acali said:

How much concrete would need to be above the patio pipe run? Just foot traffic there.

Click to expand...

About 4" min., Preferably, keep the top of pipe below the bottom of concrete, so it doesn't create a stress point to crack along the pipe line.

Probably too low to catch the the trough drain end.

Possibly run the channel drain the entire way. It might cost a little more, but would save some digging.

You can get 8" trench drain in nearly 16" depth (or 4" up to nearly 12"). No idea how the cost compares to what you've planned.

I have the trench dug, pipe laid, backfilled and tamped.
It's now 20'x24"x8" deep.
Should I be putting any remesh or rebar in there?

The trench is right against the edge of the garage slab.

I would run a couple 3/8 diameter bars down the length.
Also after you pour, at 20' feet long, you might want to float or cut in one or two perpendicular control joints.