 The do's and don'ts of flooded grain. You're listening to the American Ag Network. I'm Jesse Allen with News of Agriculture. While with disastrous flooding going on in the Midwest, it's important to remember the do's and don'ts of grain impacted by flood water. Dr. Charles Herberg of the Iowa Grain Quality Initiative says the first thing to remember about flooded grain under moving river water is it is considered adulterated.