Help!

I hope someone can help me figure out what is happening with my car. Everytime it rains the front side passenger floor of my car is soaked. Really soaked. I have to take the matt out and let it dry off outside and I can easily soak up a towel with all the water that is in my car. I have looked around the outside of my door but I don't see any signs of a leak and I also don't think it's the windshield.

(2002 x5 4.4i)

Thanks,

virginia