The footwell in my Mondeo gets wet because the water puddles on the car trim under the door and then overflows into the footwell.
If the car is up slightly at the front, it overflows at the back of the door opening, and vice-versa.
All the door rubbers appear sound, the car is only 3 1/2 years old.
A hole at each end of the outer rubber seal to stop the water from puddling in the groove will cure the problem.
Stephen James, March 2005