Rice University marine biologist Adrienne Correa taking samples at a Flower Garden Banks reef in 2016. (Copyrighted photo courtesy of Jesse Cancelmo for non-commercial use only.)

Rice University marine biologist Adrienne Correa taking samples at a Flower Garden Banks reef in 2016. (Copyrighted photo courtesy of Jesse Cancelmo for non-commercial use only.)

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Harvey Runoff Menaces Texas' Coral Reefs

Saline levels dropped 10 percent in one day over parts of Flower Garden Banks

The more than 13 trillion gallons of floodwater from Hurricane Harvey have created a massive plume of freshwater in the Gulf of Mexico that is threatening the coral reefs of the Flower Garden Banks National Marine Sanctuary about 100 miles offshore of Galveston.