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Discussion Starter · #1 ·
I am installing a channel drain in front of my driveway.
Running along underneath the channel drain I need to bury a 3" PVC pipe.
The pipe carries water from a downspout and will connect to the channel drain at the end of it.
I've cut and excavated the concrete but have some questions on how I should put the pipe in.


Can I just lay the pipe on the bottom of the trench and cover it with concrete? (first picture)


Or should I bury the pipe in the ground and cover it? (second picture) If so how far under the ground should it be?


Should either option have gravel anywhere?
 

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Property Mgt/Maint
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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.
 

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Discussion Starter · #7 ·
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.
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.
 

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

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Discussion Starter · #10 ·
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.
 

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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.
 
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