2002 Corsa wet passenger footwell

[grumpynuts]

My daughter has a 2002 Corsa 5dr,the passenger footwell is constantly wet after it rains.
Several garages have looked at it and come up with no solutions or causes. I am hoping that it is a common problem with these cars and there is a fix. My flippant remark to her was that I'd drill a few holes in the floor so that the water could at least drain out, but I'd like to stop it coming in. Anybody else heard of this problem?. Cheers Guys.