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The Atchafalaya Basin system comprises three floodways. Two of these, the West Atchafalaya Floodway and the Morganza Floodway, are at the northern end.Together with the Atchafalaya River, these floodways are designed to pass flood waters into the third component, the Lower Atchafalaya Basin Floodway, which is 833,000 acres (3,370 km 2) in size and is bounded on the north by U.S. Route 190, on ...
The Atchafalaya Basin, or Atchafalaya Swamp (/ ə ˌ tʃ æ f ə ˈ l aɪ ə /; Louisiana French: Atchafalaya, [atʃafalaˈja]), is the largest wetland and swamp in the United States. Located in south central Louisiana , it is a combination of wetlands and river delta area where the Atchafalaya River and the Gulf of Mexico converge.
This flooding, plus any additional water from a Morganza Spillway release, together determine the total extent of flooding throughout the Atchafalaya Basin during a major Mississippi River flood. At risk in the Atchafalaya Basin are Morgan City (population 13,500), various smaller populated places, many farms, thousands of oil and gas wells ...
The Morganza Floodway, between the Mississippi and the Atchafalaya Basin nearby downstream, is normally closed. It can be opened in an emergency to relieve water levels and water-pressure stress on various levees and other flood-control structures, including the Old River Control Structure.
The Great Flood of 1927 prompted the Louisiana Legislature to pass several flood control bills, including the Flood Control Act of 1928, as well as Mississippi River & Tributaries (MR&T) Project. The result was the Atchafalaya Basin Floodway system, channelization (Whiskey Bay cutoff), and bank stabilization projects.
Two egrets on the limbs of a cypress in the Atchafalaya flood basin. The Atchafalaya River meanders south as a channel of the Mississippi, through extensive levees and floodways, past Morgan City, and empties into the Gulf in Atchafalaya Bay approximately 15 miles (24 km) south of Morgan City. Since the late 20th century, the river has been ...
Here is the latest map showing the weather alerts issued by Spain’s national forecaster Aemet. On the east coast, Valencia remains subject to an orange alert, with up to 100mm of rain forecast ...
This diversion was deemed necessary to protect levees and prevent major flooding in Baton Rouge and New Orleans, with the tradeoff of exacerbating flooding in the Atchafalaya Basin, and will also reduce floodwater stress on the Old River Control Structure upstream. This was the first opening of the spillway since the 1973 flood. [7] [34] [35] [36]