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Placement tolerance matters most for

  • A.the core material within the structure
  • B.the geotextile filter beneath the structure
  • C.single layer interlocking concrete armour units
  • D.randomly placed rock armour on a rubble mound slope

Answer: C

Correct answer: single layer interlocking concrete armour units

A single layer system develops its stability from interlock, and interlock only exists if the units are placed at the specified density, orientation and pattern - so placement is surveyed unit by unit and verified against the design grid. Rock armour placed at random is far more forgiving, and core and filter layers more forgiving still.

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