All very interesting but I dunno if 100 years is really a good thing or a bad thing.
I have about $100k of big O drainage tiling in my farm dirt. After about 10 years it is all plugged up from clay fines and has to be redone. As you prolly know, they use a tile plough now to install new tile. Although my wife and I have probably laid a few miles of Big O by hand, the days of laying clay tile by hand are gone. Basically, new tile is laid by ripping right through the old tile runs to lay the new ones. So if it really lasts 100 years, then 90 of those years are just wasted. It might be better if it didn't last so long. If I lived long enough, I'd prolly end up with a foot deep layer of plastic big O soil down there and the ministry will be adding a new soil type called Oh Dirt. It will be perfect for growing rice cuz nothing will drain by then.
Don't get me wrong, I'm not against BigO drainage pipe, it's easier to work with than clay tile. But I'm thinking maybe 100 years is not an ideal life span. For farming applications, it would probably be better if it disintegrated in 20 years or so. Unless they can figure out how to stop it from plugging up.