Employ a hydraulic or mechanical system to raise the house temporarily just prior to and during the flooding.
From the Silman Report
Option C integrates a permanent hydraulic system into the building’s foundation so that in the event of a flood, the house can be mechanically lifted above the flood lines and lowered to its original elevation once the flood recedes. A first potential solution investigated was a simple seismic scissor lift but this did not demonstrate sufficient rigidity and stability in a lateral direction. After much study and refinement, a system that combined steel truss linkages and hydraulics was selected. The scheme for Option C would begin similarly to that of Options A and B: the existing foundations would be removed and replaced. However, in Option C, the foundations would be replaced with a new concrete pit into which hydraulic cylinders would be affixed.
The house would be attached to a new concrete slab located below grade which would form the ceiling of the pit; the house and slab would be lifted together by means of hydraulic actuators Much of the equipment for the hydraulic system could be located below grade in the pit.
The major advantage with Option C is that once the work is completed, the house will look and feel as it always has; all new structures will be hidden below grade until the mechanism is activated. The system would be a permanent solution that would directly attach to and become a part of the structure. The system as designed is completely reversible, albeit with a good deal of effort required to accomplish this.