A physics-based look at the Johnstown Flood

Some one had been reading about the Johnstown Flood and left David McCullough's fine book on one of our library tables. I remember being enthralled as I read it years ago. It prompted me to see if there were any 3D geographic renderings of it online.

I was delighted to find this "physics-based simulation of it: https://youtu.be/tMc9kP9q-d8