Abstract: An adjustable flood barrier assembly is removable, temporary and D.I.Y. (Do It Yourself) flood barrier. It consists of panels, and structural framing members, that can be customized for varying sizes of doorway openings, which will cover most residential doors. Once installed at doorway openings, it will prevent flood damage to buildings due to water ingress through door openings during storms or floods. The proposed barrier can resist water pressure and prevent water ingress into buildings up to a few feet of water. The assembly is narrow enough to fit within the gap between outer face of door and outer edge of jamb of usual doors in buildings, and can be installed just outside the door so that door can be closed or opened as desired. It consists of impervious panels, and sliding type so that they can be adjusted to suite to various widths. These panels will connect to horizontal members which bear on jambs.