Greiner said you must act fast to save wet corn before it molds. Wet grain can start molding in a few hours in warm weather. Do as good of a job as possible of separating the dry corn from the wet. Moisture won't travel more than a few inches above the floodline in the corn bin or crib. A pneumatic grain conveyor, that can probably be leased from a local elevator, will suck dry grain from the top of the bin like a vacuum cleaner.
Re-store the dry corn.
Dry the wet corn as soon as possible after the water recedes, then it can be re-stored or sold. Wet corn will spoil in a few days. Be very careful when using a pneumatic conveyor on the top surface of grain. The conveyor can withdraw grain so rapidly the operator can be sucked into the grain and be suffocated. If the wet grain will be fed, consider high-moisture grain storage.