A saltwater wedge is making its way up the drought-stricken Mississippi River, threatening drinking water for parts of southern Louisiana. It could travel north to New Orleans.
The steady creep of that saltwater wedge — which could threaten drinking water supplies in multiple Louisiana communities, undermine agriculture and prove corrosive to infrastructure — has left officials to scramble in an effort to slow down the“Based off the current forecast and projections, if no action is taken, we potentially could see the saltwater wedge all the way up to the French Quarter,” Col. Cullen Jones, commander of the New Orleans District office of the U.S.
The most immediate action includes expanding an underwater barrier, known as a sill, that the Corps initially constructed in July in an effort to slow the progression of saltwater from the Gulf. Ricky Boyett, a Corps spokesman, said work on the underwater levee is expected to begin early next week and continue for roughly two weeks. Ultimately, workers plan to create a barrier that rises 60 feet from the river bottom and stretches about 2,200 feet, in an effort to slow the march of saltwater up river and buy time.“I want to be clear that if the current conditions persist, we will not be able to prevent overtopping of the sill by saltwater,” Jones said. “But we can delay it.
In a typical year, the flow of the Mississippi is generally sufficient to prevent salt water from intruding very far upstream. But several factors in recent months have allowed salt water to find its way at least 64 miles up the river so far.
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