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The Old River Control Structure is a complex containing the original low-sill [6] and overbank [7] structures, as well as the auxiliary structure that was constructed after the low-sill structure was damaged during the Mississippi River Flood of 1973. The complex also contains a navigation lock and the Sidney A. Murray Jr. Hydroelectric Station.
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.
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 ...
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).
Dec. 4—Rain, heavy rain, heavy rain, rain, rain, rain, rain and rain. That's the National Weather Service's forecast for Monday to Thursday, day and night, out of the Chehalis-Centralia Airport.
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]
These “channel-jumping” events, which are called avulsions, have caused some of the deadliest floods in human history. Avulsions on China’s Yellow River killed over 6 million