The most noticeable change in The Big Easy casino market 10 years after Hurricane Katrina is the 14-foot-high concrete-and-steel wall that encircles Boomtown Casino New Orleans . “With the big iron doors, it kind of reminds you of ‘Escape from New York,’ ” said Boomtown general manager Harold Rowland, comparing the Harvey Canal Floodwall to prison walls in the 1981 John Carpenter film.