Discussion
Long term shoreline change rates on eroding sandy coasts are commonly of the order of
Answer: B
Correct answer: a fraction of a metre to a few metres per year
Typical long-term retreat rates on eroding sandy coasts run from a few tenths of a metre to a few metres a year, with soft cliffs at the upper end. Small as they sound, they accumulate to tens or hundreds of metres over the life of a building, which is why setback lines are drawn on a hundred-year projection and why the rate must be measured over a long record.
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