What was the flood in O Brother Where Art Thou?

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Primary inflows: Coldwater River

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arose spontaneously. The title of the film is a reference to the 1941 Preston Sturges film Sullivans Travels, in which the protagonist (a director) wants to direct a film about the Great Depression called O Brother, Where Art Thou?

Subsequently, question is, what year is O Brother Where Art Thou set in? 1937

what are the sirens in O Brother Where Art Thou?

Cast (in credits order) verified as complete

George Clooney Everett Mia Tate Siren Musetta Vander Siren Christy Taylor Siren April Hardcastle Waitress
Where was last scene in O Brother Where Art Thou filmed?

( 2000)