Passenger side carpet soaking wet after heavy rains

Ok…so I checked out the passenger side sun roof outlets on top of the car and found the opening completely blocked by a cake of mud, so much so that I couldn’t even see the opening initially. Once I cleaned that and poured some water near the opening water started to drain out from under the car fairly efficiently. I am hoping that was the only blockage and this is what caused it to overflow and find its way under the passenger seat floorboards.

The carpet seems to be still somewhat wet but its a lot more dry than before. I don’t know if there is water in the rocker or under the floorboards. How important is it to look in there to see if there is water and to remove it? Is there a way it would drain out from somewhere else without me having to remove it. I want to make sure the water will get out somehow so the body does not rust out.