Town and country

I know it's not a truck but people here seem to be helpful
I drove my wifes 99 town and country today and I noticed the sound of water
sloshing around when I stopped. Noticed the carpet is wet where the firewall and floor meet. Pulled the plate up under the door and I could see water down in the rail under the door.
How can that fill up with water and if it happens a lot why doesn't it drain out. Is there a drain plug someplace? I didn't look yet because my drive way is wet from the rain.
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