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The pix really help.
Pull the front door trip moldings (the black ones at the bottom of the door frame) and try to peel the carpet back from the rocker panel so you can see the plastic cups that seal the 2 inch dia. holes that access the inside of the rocker panels.
If you can't move the carpet enough, pull the front seats and the entire carpet. I you need to use the car, put the seats back in "raw" and cover the foot wells with 10 to 15 thicknesses of old newspaper, or an old piece of carpet.
A look inside the rocker panel may reveal the cause. Flowing drains are good, but there still can be some 10 year old leaves and such that are holding water.
To clean, remove the panel that holds the lower anchor for the seat belts, it makes a larger access hole. Then get in there with a vacuum cleaner. Suck out all you can, and - if possible - reverse the air flow and blow in there to dry things out and loosen up more grunge.
There may be some spray on sealer, undercoat or something, that you can put in there after cleaning. Protecting the drain holes, of course.
The door corners look like the (1) the drain holes are plugged and (2) the outside scraper moldings have shrunk leaving a gap at each end allowing rainwater to get in. Have you noticed water dripping out of the bottom of either front speaker?
Remove the trim panel and have a look. Again, clean as best you can, and seal it up. The inner surface of the outer door has a foot-square piece of some sort of sound deadening material glued to it and, after 16 years, the glue fails and the thing slides down into the bottom.
Best luck,
Bob
:>)
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