drain grid 61 so that drain channels 65 follow a gentle slope downward towards retaining wall blocks 31 in such a manner water draining into drain channels 65 flows urged by gravity towards blocks 31 and then enters blocks 31 into the internal drainage cavities 40 not shown as previously described through passages 47 of blocks 31 header portion 67 of mesh 63 is sufficiently flexible such that if a light curvature is desired in the retaining wall individual blocks 31 may be slightly angled to accommodate such a curvature without affecting the attachment of header portion 67 to protrusions 43 of blocks 31 and securing of output ends 66 of drain channels 65 into passages 47 of blocks 31 0071 fig4 b is a section view of drain grid 61 and retaining wall blocks 31 of fig4 a taken along section line c c in this view three blocks 31 are arranged in their installed position as in fig4 b drain grid 61 is layered directly atop the upper surfaces of blocks 31 and attached at the header portion 67 to blocks 31 as illustrated in the previous figure protrusions 43 can be seen protruding up from the upper surfaces of blocks 31 and extending up through mesh 63 of drain grid 61 as previously described drain channels 65 of drain grid 61 are now clearly shown seated into passages 47 each of which open into drain cavity 40 recessions 48 are shown along the bottom of each block 31 positioned relative to passages 47 along the top of block 31 a plurality of drain holes 32 are.