Abstract: A channel forming dewatering device for use in preventing the penetration of water into an underground room away from a wall. The device provides a baseboard member having an upper flange connected to an angular section. The angular section is, in turn, connected to a vertical section. A bend section attaches a web to the vertical section. A lower flange attaches to said web. The baseboard member is to be placed against a wall proximate to the floor. The upper flange and lower flange contact the wall. The web attaches to the floor with an adhesive such as an epoxy. A flexible liner is placed between the web and the floor. This flexible liner is such that it will better attach to an adhesive. In the preferred embodiment, the flexible lining is extruded with the baseboard member. Grooves are placed through the flexible lining and partially into the web to allow a channel into which the adhesive such as epoxy can flow.