Mississippi Katrina flooding by land type

Good to know the next time i'm at the Isle of Capri that the surge will be largely stopped by Dog Island.  Being familiar with the coast and having been out on both Ship and Dauphin islands, i can say the 15 ft foot surge there topping them is no surprise, but the relative lack of flooding from the surge in the very flat area from Biloxi to Gulfport (and beyond) comes as quite a surprise. I take that to be -much like Destin, the area is a peninsula and the water just drains right off and doesn't stick around to 'flood'.