What i do is put some perches high enough so if the water does rise in the coop they can get up and stay dry. Where we live we get a tidal surge but no waves battering the coop or anything, therefore i am not worried about the coop getting smashed up. We do get winds and i can tell you. We have already had higher winds here today from IKE than when GUSTAV hit a couple of weeks ago. The water is 4-5 foot above normal tides way over here in MOBILE. I can't even imagine what is about to happen to GALVESTON. But yeah my chickesn could make it i feel. I put a make shift feeder up there and waterer up high. on a piece of plywood that they can walk on from their perches to eat and drink if the water gets up to about 4 foot in the coop. My slab on the cop is around 11 foot. So i could take a 15 foot surge probably. But from what i here G-town is getting a 20 foot surge. Katrina put more than that in Waveland, MS, just to give everybody a perspective of what these cyclones can do!!