I'm a fan of the high ground idea. You can check the 100 and 100 yr flood predictions to verify in your specific case, but even in cases of dams breaking, flood waters rarely rise over 30' (case dependent) so as long as you have a swail around both sides of you house that will accommodate a 100, 500 or 1000 yr flood you should be good, and in case of flood have a mote to prevent looters from accessing your stuff.