High-strength fabric wall that can be deployed (vertically or horizontally, depending on design) rapidly for flood protection around/between buildings and equipment, across doors of any size or across window walls. Can be arranged to fit around any structure using intermediate support posts. Can be easily deployed or stowed by a single person even in high winds. Flex walls can surround entire spaces (buildings) or free-standing equipment, or span openings and seal against existing walls (doors, driveways, etc.).