JKSwim:
W/o knowing the story why comment?
The sand was put here at the behest of residents. They begged and pleaded and the Corps listened. The cheapest alternative would have been offshore, open water disposal. The cheapest 'beneficial' use was to put the sand nearshore and hope natural wave orbital motion would bring the sand to the beach. So that answers the why. They were going to do it anyways, this is a little more expensive. The BEST option was to pump it onto the beach directly but the $$ was way to high.
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