Discussion
Doubling the design wave height increases the required armour unit mass by a factor of approximately
Answer: B
Correct answer: eight
The Hudson formula makes the required mass proportional to the cube of the wave height, so doubling the height multiplies the mass by \( 2^3 = 8 \). A unit of five tonnes becomes one of forty, which may exceed what a quarry can supply or a crane can place, and is often the point at which concrete units replace rock.
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