A water drainage system may include a clip having a support arm, a catch arm, and a brace. The support arm may include a support arm contact surface that may be opposingly positioned to the brace. A rail may have an upper plate, a back plate, and a lower plate. The lower plate may include a plate lip that extends toward the upper plate, and a channel may be formed in the rail that extends between the upper plate, back plate, lower plate, and plate lip. The upper plate may include an upper plate contact surface that is disposed within the channel. An optional waterproof membrane may be coupled to the clip and rail by engaging the clip to the rail with a portion of the waterproof membrane tensioned between the support arm contact surface and the upper plate contact surface.