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Consider the following statements about extreme water level assessment.
1. Still water level combines the tide and the surge.
2. Wave setup and runup are added on top of that level.
3. Wave runup is part of the still water level itself.

  • A.3 only
  • B.1 only
  • C.All of them
  • D.1 and 2 only

Answer: D

Correct answer: 1 and 2 only

Statements 1 and 2 describe the standard build-up: the still water level is tide plus surge, and wave setup and runup are added on top of it. Statement 3 confuses the two - runup is the wave-driven excursion above the still water level, not part of it, and adding it twice would overstate the design level substantially.

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