Discussion
Assertion (A): An accurate as-built survey is essential to later monitoring.
Reason (R): Subsequent surveys can only be interpreted against a known starting condition.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the necessity. Every later survey is interpreted as a difference from the one before, and the first of them must be the as-built. Without an accurate record of where the structure was when finished, settlement cannot be distinguished from construction tolerance, nor armour displacement from as-placed irregularity, and years of monitoring yield nothing conclusive.
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