Water drainage assembly for use in a refrigeration appliance comprising - an outer case which includes two mutually opposing lateral outer walls, a rear outer wall and an opening which is formed into a vertical planar portion of the rear outer wall, wherein the vertical planar portion extends along a lateral direction which is perpendicular to the lateral outer walls, - an inner case which includes a rear inner wall and an drainage outlet which is formed into a curved portion of the rear inner wall, wherein the curved portion extends straight along said lateral direction, and wherein the opening lies lower than the drainage outlet, - a water drainage apparatus which includes a main body, an upper mounting seat and a lower mounting seat which are formed on opposing ends of the main body, wherein the lower mounting seat is configured to form-fittingly abut against the vertical planar portion, and wherein the upper mounting seat is configured to form-fittingly abut against the curved portion and an inclined channel which is formed into the main body, wherein the channel is configured to fluidly connect the opening with the drainage outlet, characterized in that - a plurality of bonding tapes is provided for sealing an interface between the vertical planar portion and the lower mounting seat and an interface between the curved portion and the upper mounting seat respectively, - a conduit is provided lying completely inside the channel, wherein a lower end of the conduit is configured to attach to a hose, and an upper end of the conduit is configured to allow the drainage outlet to penetrate into the conduit, - the bonding tapes include a double-sided first bonding tape which is provided with a through-hole, wherein the double-sided first bonding tape has a size and shape which is configured to adhere to the lower mounting seat and to the vertical planar portion such that the channel fluidly connects the opening with the drainage outlet through said through-hole. - an outer case which includes two mutually opposing lateral outer walls, a rear outer wall and an opening which is formed into a vertical planar portion of the rear outer wall, wherein the vertical planar portion extends along a lateral direction which is perpendicular to the lateral outer walls, - an inner case which includes a rear inner wall and an drainage outlet which is formed into a curved portion of the rear inner wall, wherein the curved portion extends straight along said lateral direction, and wherein the opening lies lower than the drainage outlet, - a water drainage apparatus which includes a main body, an upper mounting seat and a lower mounting seat which are formed on opposing ends of the main body, wherein the lower mounting seat is configured to form-fittingly abut against the vertical planar portion, and wherein the upper mounting seat is configured to form-fittingly abut against the curved portion and an inclined channel which is formed into the main body, wherein the channel is configured to fluidly connect the opening with the drainage outlet, - a plurality of bonding tapes is provided for sealing an interface between the vertical planar portion and the lower mounting seat and an interface between the curved portion and the upper mounting seat respectively, - a conduit is provided lying completely inside the channel, wherein a lower end of the conduit is configured to attach to a hose, and an upper end of the conduit is configured to allow the drainage outlet to penetrate into the conduit, - the bonding tapes include a double-sided first bonding tape which is provided with a through-hole, wherein the double-sided first bonding tape has a size and shape which is configured to adhere to the lower mounting seat and to the vertical planar portion such that the channel fluidly connects the opening with the drainage outlet through said through-hole.