A flood barrier, comprising: a wall including a first flexible sheet and a plurality of parallel wall support members embedded in the first flexible sheet; a base including a second flexible sheet and a plurality of parallel base support members embedded in the second flexible sheet, wherein the first flexible sheet and the second flexible sheet are made of the same material and formed from a single continuous sheet; a hinge connecting the base to the wall, wherein the hinge is nothing more than a bend in the single continuous sheet; at least one angle support member configured to be fixed to a flooding side of the flood barrier at the base and at the wall in an erected configuration, wherein the angle support member helps fix the angle at the hinge between the wall and the base, wherein the angle support member is fixed to the wall at least in part by fixing the angle support member to one of the plurality of wall support members or is fixed to the base at least in part by a fixing the angle support member to one of the plurality of base support members; a first tether from the base to the wall on a flooding side of the flood barrier preventing the wall from opening beyond a desired angle at the hinge between the wall and the base, the first tether having a first end coupled to a first support member of the plurality of wall support members and a second end coupled to a second support member of the plurality of base support members; and wherein the at least one angle support member is configured (i) to act as a limiter to hold the wall up relative to the base in the erected configuration and ii), with the first tether, to act as a limiter to counteract a horizontal force of water after flooding; wherein the flood barrier provides flood protection when in the erected configuration, and wherein the flood barrier is capable of closing to a collapsed configuration by bending at the hinge. a wall including a first flexible sheet and a plurality of parallel wall support members embedded in the first flexible sheet; a base including a second flexible sheet and a plurality of parallel base support members embedded in the second flexible sheet, wherein the first flexible sheet and the second flexible sheet are made of the same material and formed from a single continuous sheet; a hinge connecting the base to the wall, wherein the hinge is nothing more than a bend in the single continuous sheet; at least one angle support member configured to be fixed to a flooding side of the flood barrier at the base and at the wall in an erected configuration, wherein the angle support member helps fix the angle at the hinge between the wall and the base, wherein the angle support member is fixed to the wall at least in part by fixing the angle support member to one of the plurality of wall support members or is fixed to the base at least in part by a fixing the angle support member to one of the plurality of base support members; a first tether from the base to the wall on a flooding side of the flood barrier preventing the wall from opening beyond a desired angle at the hinge between the wall and the base, the first tether having a first end coupled to a first support member of the plurality of wall support members and a second end coupled to a second support member of the plurality of base support members; and wherein the at least one angle support member is configured (i) to act as a limiter to hold the wall up relative to the base in the erected configuration and ii), with the first tether, to act as a limiter to counteract a horizontal force of water after flooding; wherein the flood barrier provides flood protection when in the erected configuration, and wherein the flood barrier is capable of closing to a collapsed configuration by bending at the hinge.