Science: Rivers Remodeled

They needed a breakwater in Puerto Rico's San Juan harbor: what with the tides, currents and dangerous shoals, the water was so choppy that naval patrol planes could not always alight. The problem was tackled by the U.S. Waterways Experiment Station at Vicksburg, Miss.

Its staff built a small-scale model of San Juan harbor, sloshed & swished its waters until it reproduced the known behavior of the harbor. Then models of a breakwater were installed and maneuvered until they worked most efficiently. Modeled on this model, the actual breakwater is part of the $30,000,000...

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