Abstract: A flood barrier system for windows for inhibiting a water breach into a residential or commercial structure. The flood barrier is adapted to fit within a retaining wall cavity using an expansion member to assist a mechanical seal so as to stop water intrusion. The barrier operates with an extruded frame having vertical reveal members and high strength glass. A sealing joint is fitted about the retaining wall and the flood barrier's vertical reveal members for inhibition of flood seepage. The sealing joint, having at least three surfaces forming an open end and a tapered end, is anchored at the bottom wall of the extruded frame member and about the glass flood barrier's vertical reveal members at least 12 inches above the base flood elevation level. Alternatively, a flood panel can be installed in front of the windows for additional protection against water intrusion into the residential or commercial structure.