In the retaining wall drain section, which labeled layer is immediately above WALL STEM?
Correct Answer
C) DRAIN BOARD
The section stacks the layers vertically; DRAIN BOARD is printed immediately above WALL STEM.
Why This Is the Correct Answer
The section stacks the layers vertically; DRAIN BOARD is printed immediately above WALL STEM.
Why the Other Options Are Wrong
Option A: FOOTING
FOOTING is an outside or terminal layer in the stack, not the adjacent layer asked for.
Option B: FOOTING
FOOTING is an outside or terminal layer in the stack, not the adjacent layer asked for.
Option D: BACKFILL
BACKFILL is a different layer in the same section, but it is not the one directly above WALL STEM.
Memory Technique
retaining wall drain layer order cue on S-751: WALL STEM anchors the one-band-up read.
Reference Hint
Open Sheet S-751; locate WALL STEM in the section and read the layer immediately above it.
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