A pneumatic grain conveyor, that can probably be leased from a local elevator [bucket 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 grainand be suffocated.