I need to run a 3" PVC downspout to the street. The issue is that the only place I have to run it is down my gravel driveway. At the house, the downspout is at least 12in below the surface of the ground. From what I understand, if using schedule 40 pipe that would be deep enough to protect it.
The issue is that the driveway slopes down and by the time the pipe would reach the concrete sidewalk it would be only 3 to 4 inches underground. Even with schedule 40 pipe, I believe that would get crushed by a car.
With a schedule 40 pipe 3 to 4 inches underground how should it be protected against being crushed by a car?