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Project design flood flows for the Atchafalaya Basin in thousands of cubic feet per second. The West Atchafalaya Floodway is a flood control structure of the Mississippi River and Tributaries Project located in the Lower Atchafalaya Basin in south-central Louisiana. It has a project design flood flow capacity of 250,000 cu ft/s (7,100 m 3 /s).
The Morganza Spillway or Morganza Control Structure is a flood-control structure in the U.S. state of Louisiana. It is located along the western bank of the Lower Mississippi River at river mile 280, near Morganza in Pointe Coupee Parish. The spillway stands between the Mississippi and the Morganza Floodway, which leads to the Atchafalaya Basin ...
The Atchafalaya Basin, or Atchafalaya Swamp (/ əˌtʃæfəˈlaɪə /; 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 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]
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.
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 ...
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.
December 1972-June 1973. Location. Mississippi Valley, Mississippi River Delta. Deaths. 33. Property damage. $252.7 million USD. The Mississippi flood of 1973 occurred between March and May 1973 on the lower Mississippi River. [1] The flooding was the third most severe along the U.S. 's Mississippi River during the 20th century.