The gist of this prophecy is that a series of large, devastating, and destructive floods are coming to this nation (the USA) and the world as a whole, to destroy the enemies of God, wash away evil, and destroy/expose the workings of the Devil and his evil men and women all over this world.  It WILL NOT be a global flood like Noah saw.  These will be localized, and appear numerously all over the world, but not all at once.  This will also be judgment against unrighteous nations who have shook their fist at God.