Although some of the scenes were cleverly done, the whole thing was completely un-believable, ie how long did that guy stay under water, and why wasn't he just swept away in the torrent?
But the "cherry on the cake" was the information included in the credits at the end. "If anyone has concerns on the chance of flood risks, please phone this premium rate number", (or words to that effect).
But still I suppose it will all help to panic even further, those more gullible global warming / climate change theorists.