Abstract: A water barrier is formed from a kit of parts comprising at least one substantially water-impermeable membrane and a plurality of water-permeable panels that, when connected together, form a structural frame including a first part for supporting the at least one water-impermeable membrane against horizontal water pressure and a second part substantially perpendicular to the first part. A support structure may connect the first part and the second part to resist deflection of the frame. In an alternative arrangement, the frame of the water barrier may also be assembled in an inverted-V configuration.