Discussion
The material excavated in forming a harbour basin is frequently
Answer: C
Correct answer: used in the core of the breakwater enclosing it
Dredged material from the basin is generally unsuitable as armour but perfectly good as core, so it is placed inside the breakwater under the underlayers and armour. This kills two costs at once - the material need not be disposed of, and core need not be imported - and it is why the excavation and the breakwater are normally planned together as one earthworks balance.
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