Water is flooding on both side floors.also in trunk and front floors

Hey Grady..
There are few things that could cause the water intrusion... Is the carpet in the front floorboard wet?.. ..Has it rained recently? This will rule out window seals leaking? Have you opened the trunk and checked to see if water is in the trunk? OK..IF it has not rained, no water in the trunk, AND the front floorboards are wet, then the heater core is leaking...
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Grady.. sounds like its either the window seals or the door seals.. check for damaged door seals, cracked window seals..

If you have been running the AC for a while and the humidity is high, the condensate drain tube is plugged which will cause water build up to eventually leak into the passenger compartment.

which side of car, what make and model, dos it have a trunk, have you had any stereo speakers installed recently or any other work on vehicle?

so if i were you i would be checking drain plug or drain opening in front of wind shield. probably it is under plastic grill next to wipers. it transfers the collected rain water infront of windshield and direct it to ground. if it is clogged flooded water can drain into cabin.

If battery leak it is not water but battery acid. If water then there must be leak into trunk.

drill a hole through the floor as a quick fix ,if it gets in let it out ,then check for the leak ,try under the firewall where the AC drain pipe is ,it could be the same pipe for drain water coming in from air intake vents

I have a 1993 ParK Avenue, the original owner said that when she purrchased the vehicle new in 1993, she has always had water getting into the trunk, I found water in the passenger rear floor and I assume it is through the trunk, I had water in the trunk, I drilled holes in the trunk , also in the floor of the passenger area, Yesterday I vaccuum the car and the passenger area was dry, I think a little water may enter the trunk but it will drain before it reaches the interior.

WHEN IT RAINS, WATER SEEPS THRU THE TRUNK AND NOW IS STANDING IN THE BOTTOM FLOOR OF THE WHOLE CAR.

I think that I can help you. It sounds like your drain-tube is plugged up. Get in the passenger side, and pull the carpet back from under the glove box. Look for a black rubber pipe that goes from a black box, and pokes thru the firewall, on the passenger side. Remove the hose from the box, and have a container ready to catch water. If water comes out of the black box, your drain hose is plugged up. Clean out the clog, and you will be golden.

Wow I thought they would have fixed this on the newer body style. My old 2000 A6 had the same issue. There is a drain in front of the bulkhead that gets blocked, in my case by pine needles from my tree. I used a coat hanger to clear it and then cleaned it every couple of months and no more drowning carpet. It used to be next to the battery(which they moved to the trunk) under the windshield wiper motor. I haven't checked the exact location on my 2005 but good to know it's still an issue.