Weephole
A weephole is a small drain hole for water. It is drilled through a wooden window sill to allow condensation water to escape; cross joints in the outer leaf of a cavity wall are left without mortar at intervals.
Weephole - An open hole to provide a means of drainage. For example, a small hole in a retaining wall or abutment to prevent the accumulation of water behind the structure, ...
Weephole: A small hole, as at the bottom of a retaining wall or masonry veneer, to drain water to the exposed face.
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Weephole
Opening left in a revetment or bulkhead to allow groundwater drainage.
Weeping Joints ...
While stones should fit snugly together in a retaining wall, don't worry about filling every little void between stones. You want to leave plenty of natural "weepholes" to allow groundwater to pass through.
" USG Corporation says it will continue to manufacture and market "water-management finish systems" that feature flashing, drainage plane, and weephole details designed to allow water that penetrates beneath the surface to escape from the system ...
 See also: Water, Drain, Wall, Window, Building
  
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