![]() ![]() What is the Mississippi River? It's not actually a silly question. How is a levee built? What's a revetment? What does the crucial Old River Control Structure look like? This explainer is intended to delve into these issues. The Mississippi was most elegantly laid out in John McPhee's stunning story "Atchafalaya," we found ourselves wishing for a simpler tech explainer (or companion piece). It's such a complex hybrid human-natural system with a deep and complex history that it's hard to know where to start. While there are thousands of news stories about what's happening, I found myself wanting basic knowledge about how the Mississippi works now. It will be nature’s call on when it might have to happen again.The lower reaches of the Mississippi River are being hit by record floods, as detailed on our In Focus photography blog. The last time it was done was after the big 2018 storm which hit the region. The hope is that the dredging project will be enough to keep the salt marsh’s channels open for several years. Raff says they know it’s been hard for nearby residents, and beachgoers, but they are working to get the project done as quickly as possible. The beach has been closed within 400 feet of the marsh mouth. The dredge liquefies the sediment to water, pumps it through a pipe which is discharged out through the marsh mouth."Īs a result of the work, a section of the beach has been closed, and could remain closed through mid-summer. "It has a cutter head on one end, which is typical to dredge harbors, and other marine environments. "It's a boat-mounted dredge vessel," said Raff. Raff says they are using a special hydraulic dredge to move the sediment out of the salt marsh. Santa Barbara County Public Works Department The dredging work is expected to take at least a few more weeks. ![]()
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