The perforated pipe is designed to have the holes pointing down to allow water to seep into or out of the pipe and still keep the flow area open. You can use this pipe to pick up water from wet areas and to distribute it into areas of high percolation.

I have never seen a drain pipe "float" out of the ground. I have put in a number of these so-called French Drains over the years using a combination of perforated and solid pipe. When I only wanted to convey water from one point to another, I used the solid pipe as you are planning to do.

It is possible for the soil over a shallow perforated pipe to erode and expose the pipe if it is very shallow because the covering soil can be washed away with the draining water. I always use as much rock as I can over the perforated section and they have stayed covered. Solid pipe sections have never been a problem whether they have been shallow or deep.

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