I have water sloshing around in the drivers side sill!!!

It looks like its been getting in through the rear passenger door sill,where on the 406 there is a rubber sealing strip which is held in place by clipping into the sill.The end piece has come out & i think the water has been getting in through the hole where it should be clipped in.
How the hell do i get the water out???
Anyone else had anything like this?