Authorities cite multiple factors for the salt water intrusion.
Most prominent this year has been a drought across the Midwest that has meant less water flowing into the Mississippi and the rivers feeding it.
Another factor is dredging, according to Stephen Murphy, an assistant professor at Tulane University’s School of Public Health and Tropical Medicine and the director of the university’s Disaster Management Program. The lower Mississippi is frequently dredged by the U.S. Army Corps of Engineers to make way for huge cargo ships serving ports vital to the
In Jefferson Parish, next to New Orleans, officials began laying out flexible piping resembling giant fire hoses in a plan to pipe water from farther up the Mississippi to dilute the salt water. This is the fifth year the Corps has built an underwater structure to slow the salt water flow. But this is the first time sill construction has been used in consecutive years. Before last year, others were built in 1988, 1999 and 2012.
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