Discussion
Assertion (A): Corrosion allowance is added to steel sections in the tidal zone.
Reason (R): Cathodic protection cannot operate reliably where the steel is not continuously immersed.
Answer: C
Both are true and the reason gives the limitation, and the tidal zone is the most severely corroded. Accelerated low water corrosion is a recognised problem in many harbours. Corrosion allowance is added in the tidal band.
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