Here's a link with some pictures
http://chicagowildernessmag.org/issues/ ... tiles.html
In the top picture 8 types of tile are shown. The 7 on the right are old-school ceramic tiles. The one on the left is plastic. We'd use 4" (diameter) plastic tile, costing about $.50 a foot. You'll see in the pictures that a trench is dug and the tile is placed in at a proper grade. There are many small holes which allow the water to enter and get channeled to an exit (in our case a creek).
I’ve seen miles of this stuff installed. It’s great, it removes excess water but it keeps enough water in the ground for crops and grass to go. The soil around the tile prevents it from breaking. The only problem is tile can get clogged by an animal climbing in and getting stuck. (Last year I saw a guy lose his lunch when he pulled a raccoon from a sewer tile coming from a pig pin. It had crawl about 150ft up this 12in sewer tile and got stuck. It died with it’s mouth open and pig crap had been forced into it for months. When the guy pulled the raccoon out it was about 4 ft long and 50 pounds because it was full of crap, literally.)
Farmer’s drive their 4000+ lbs combines and such over these buried tiles all the time with no problems, so I doubt the city tractors or trucks will hurt it. And even if the tiles crack, as long as the bottom of them remains intact they still work fine (as long as gravity exists that is).