No, why would you want a 15' raised slab? Build the house on piers, leave the slab on grade. You can install break away walls on the ground floor so the house will "look" fairly normal and you'll even have some usable space down there. Keep all the main parts of the house on the 2nd floor on top of the first floor assembly and you're good to go.
Surge comes in, your walls break away around your garage, damage is minimal, house survives. Easy, it just cost a bit more to build this way and you become more limited in your architecture.