It is crazy they build the system to a 100 year standard. The Dutch delta works are build to a 2000 4000 or 10000 year standard, depending on the area being protected. https://en.m.wikipedia.org/wiki/Delta_Works
Stealing a line from others, but: That's the difference between the US and Europe. In Europe, 100 miles is a long distance. In the US, 100 years is a long time.
