Why are groins NOT a perfect solution for saving beaches from eroding? A) They increase erosion in the downdrift area. B) They completely trap all longshore drift. C) They increase amount of sand on one side of the groin. D) They are difficult to build. E) They are difficult to position on the beach.

Question

Quizplus · Accepted Answer

Groins trap sand on one side of the structure, causing a downdrift erosion problem where sand is removed from the beach in the area that "loses" sand due to the groin. Therefore groins are not a perfect solution for saving beaches from eroding.

Why Are Groins NOT a Perfect Solution for Saving Beaches