[timer]

Ok, since you are a construction expert, price this out : a 20 ft high dirt levee that is useful .01% of the time as a flood barrier, vs a 8' deep concrete wall, w/ftg, w/hinged double layer 20'x20'steel panels(trusses between), tough rubber coating on top, deep set dead man anchors, that is a roadway 99.99% of the time. No bias now, an honest cost comparison....Kitty Hawk is also on the NC coast, yes? A century ago 2 brothers heard these same "it'll never work" objections about this strange contraption they were testing...

[pageonetoo]

Nothing is practical. The beach at Kitty Hawk is in a different place than when the wright Brothers flew there!

An 8 foot deep concrete wall would be undercut within a few minutes by a storm surge (ever heard of them). The wave interaction would then begin its destructive work on your "floating" roadway. Dead man anchors are good for a small project, but to rely on their stability along miles of roadway is not practical in the face of such reality.

There is a significant difference between making a proper airfoil on a lightweight frame, and constructing your "floating roadway". For an example of a hurricane's destructive power, look at the bridge across Lake Ponchartrain... or the beaches of NC after a storm...

I'm sure they were designed by an architect... sitting in a room with his pipe spewing smoke!