Confused about the dam and the flood
I binge-watched the first season a few years ago. Now I've seen the first two episodes of season two (and part of the third episode) and can't remember everything from season one.
In the first episode of season two they don't understand how the flood happened. They've inspected the dam and can't find a leak. But then in episode three they show a dam collapsing and flooding the town 35 years earlier. Was a new dam built after that further upstream? This might have been explained in season one but it's hard to remember all the details.