Abstract: A drainage system preferably to eliminate wet and damp basements which is formed from an inexpensive, easily assembled pair of sheet metal members. A strip of waterproof sealing material is placed on the basement floor extending along the basement wall with one of the sheet metal members having an L-shaped configuration being mounted on top of the strip of sealing material and secured to the floor by fasteners. An upstanding leg flange of the L-shaped member is spaced from the wall and forms a drainage channel with the wall and floor. The second sheet metal member is removably mounted on the top edge of the upstanding leg member and extends generally horizontally across the top of the drainage channel and engages the wall to form a removable top closure for the channel. A plurality of holes are drilled through the basement wall adjacent the basement floor to permit outside water to readily flow through the wall and into the drainage channel.