water leak
 

My son has a water leak in his 97 Civic. The only part that gets wet is
the driver's side floor. I have looked for holes and can find nothing.
I even ran water over the driver's side for 10 minutes and no leaking
water is seen. This doesn't happen every time it is wet outside.
Anything I can look for? I'm lost as to where the water is coming in.
Thanks.

Mike