Not only can they survive, floods usually improve the habitat by scouring out river bottoms, creating new pools and cleaning out the silt.By Mark Floyd, 541-737-0788 Source: Stan Gregory, 541-737-1951And this from PFBC;As Pennsylvania Fish and Boat Commission biologist Dick Snyder points out, a flood is a natural event and Mother Nature equips her charges to deal with that which comes their way.