I'm not sure you saw the scale of that spillway. It is _massive_. Something like 300ft wide and 3000 feet long. An entire football field wide. It's quite obviou

I'm not sure you saw the scale of that spillway. It is _massive_. Something like 300ft wide and 3000 feet long. An entire football field wide. It's quite obviously not 4 inches thick, but admittedly at the scale of it, 15" doesn't seem like a lot. There's a bunch of great pictures on imgur with "humans for scale" https://imgur.com/gallery/mpUge https://imgur.com/gallery/mpUge