Connectable drainage device

A drainage device for use under a floor in a structure including the floor, a foundation wall, and a footing located below the foundation wall, the drainage device being constructed for placement on the footing adjacent to the foundation wall prior to installation of the floor to permit water to flow along the footing under the floor, the drainage device comprising a wall member having a first surface facing away from the footing and foundation wall when the drainage device is placed on the footing, and a second surface facing generally toward the footing and foundation wall when the drainage device is placed on the footing, the wall member comprising a wall section for engaging the foundation wall and a footing section for engaging the footing, a plurality of protrusions projecting outwardly from the second surface of the wall member and opening at the first surface of the wall member, at least some of the protrusions being connecting protrusions sized and shaped for an interference fit with connecting protrusions of another drainage device having the same construction so that when the drainage devices are overlapped they are connected together in a close conforming relation, the connecting protrusions including feet on the footing section and elongate channels on the wall section, at least one of the elongate channels extending at an angle to another of the elongate channels.