If you've seen one disaster movie then you're better off not watching Flood. It's a mess - predictable plot, cliched dialog, bad acting and even worse directing. There's no sense of timing and the action criss-crosses between the various characters at a dizzying pace that makes it difficult for you to feel for any of them.
For a good cast of actors - Robert Carlyle, Tom Courtenay, David Suchet and Joanne Whalley, only Joanne Whalley does a halfway decent job.
I have two words for this movie: Stay Away.
2/10