PURPOSE: A drainage trench is provided to prevent the surface part of a cover from being bent by alternately forming longitudinal protrusion parts and insertion parts on the surface part of the cover. CONSTITUTION: A drainage trench comprises a trench body(10) and a cover(20). The cover is composed of a surface part(22), and vertical and horizontal support parts(24,26). Protrusion parts(222) and insertion parts(224) are alternately formed on the surface part. Drain holes(224a) are formed on the insertion parts at uniform intervals. The vertical parts are inserted into the side parts(12) of the trench body. The horizontal parts are supported to a bottom part(14) of the trench body.
