Doesn't sound too different than a hurricane (ask me how I know..) Take lots of pictures and get that wet carpet and padding out before the mildew causes more damage than the water. You can claim fiduciary responsibility to protect your property from further damage if the adjuster gets their panties in a wad over you taking the carpet out (or drywall/insulation, etc.)
Also, if the damage is significant, you can look forward to your mortgage company holding the funds while you foot the bill for the repairs. They do have to release a certain portion to help you get started, but after that it's peacemeal and receipts are required.
Best of luck. Keep us informed on the progress.
