"The Fatal Flood of 1927"

is another great documentary we saw on the bus that first day. The 27 flood has parallels to the Katrina disaster and was also a big turning point in the history of the Delta.

There's also a recent book about it that it very good, Rising Tide. The short version of the story is that the blacks could have been evacuated, but the planters didn't want to risk that they would never come back to grow cotton, so they forced them to stay and shot them if they refused to work on the levee.