Look under your foot well, you will find a couple of large OE rubber stoppers (if you will), can't remember exactly what they are called. Cap, plug, something like that. Anyways, perhaps those have rotted.
demmmmmmmm happend tu me that like 3 days ago
i just finished raining and all the floor in driver side was water
i didn't knwo what was it after i took the carpet out and dry out i figurate that the wire to my amps are going from underhood and the water just wend on the wires stright inside my car. i fixed my wires that the wodre will drop before get inside ,and i hope now is ok