Mystery of the Megaflood: Nova

Somewhat interesting but ultimately disappointing documentary about a big flood that happened in the northwestern part of North America about 15-20,000 years ago. I got this because I thought it was going to be about the theorized megaflood that happened in the Tigris/Euphrates river valley thousands of years ago, thought to have inspired various flood "myths", and recorded in the Bible. None of that here, though, unfortunately. I don't even think prehistoric man had arrived in North America yet when this megaflood took place.