Drainage liners and geomembranes including the drainage liners are disclosed herein. The drainage liners have a woven scrim made of warp tapes and weft tapes, and have a plurality of high-denier strands each superimposed upon a warp tape or each superimposed upon a weft tape and each interwoven into the woven scrim by oppositely oriented tapes. The warp tapes or the weft tapes with superimposed high-denier strands thereon are spaced apart within the woven scrim by at least one tape of a same orientation, thereby defining a plurality of parallel channels for fluid flow between nearest neighboring high-denier strands.