What Do Ontario in 2014 and New Orleans in 2004 Have in Common?

Both of them are putting their faith in a dyke.

Indications are that both will end about as successfully.

Update, August 7 2014: To the same three Americans who keep visiting this page from their referrer site over and over and over again, how's recent events been doing at refuting my thesis? Yeah, that's about what I thought.