water in passenger footwell?

i recently had a accident in my 55 plate vectra i was stationary at the time when i was hit from behind by a cleo, the car went in for repair i thought great! i got the car back saturday it was parked up all day and night. we had alot of rain for about 15 hours that night i dint think anything of it untill i got in my car the sunday afternoon and there was a puddle of water in passenger footwell!! any ideas anyone? could the accident have affected it or during the repair????