water leak?

i have a 4 dr 1994 integra, living in japan. everytime it rains my passenger side floor gets wet. i pulled up everything to look at the floor and cant seem to find out where it is leaking from. anybody know?

had mine leak from where the fresh air comes in straight onto the passenger floor. seemed it was leaking right through the blower. seemed there was a seal broken on the piece that goes over the fresh air vent on the outside of the car.