 Weeps may also be necessary in a retaining wall, so water can escape from the retained earth, thus lessening the hydrostatic load on the wall and preventing damage to the wall from the excess water weight and possible moisture damage from freeze/thaw cycles.In such cases the weeps may consist of a plastic, clay or metal pipe extending through the wall to a layer of porous backfill.Typically, weeps are arranged to direct water which may have entered an assembly from outside, back to the outside.