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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.
Its basin is characterized by flat, fertile agricultural land, with only a few major cities. The drainage basin of the Red River is very arid and receives little precipitation. As a result, much of the river above the Texas–Oklahoma border is intermittent, and the flow varies widely until the river is beyond its great bend south in Arkansas.
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 U.S. Army Corps of Engineers measured the amount of water flowing through the Mississippi River and compared it to the amount entering the Atchafalaya Basin by monitoring "latitude flow" at the latitude of the Red River Landing, located five miles (8.0 km) downstream of Old River. In this case, latitude flow is a combination of the flows of ...
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 ...
OU researcher Theresa Tsoodle said flooding could be mitigated by federal and state agencies working with tribes to understand the ecology of an area. Study: Tribal lands in Oklahoma are 5 times ...
2.14 2015 Texas-Oklahoma flood. 2.15 2015 Louisiana flood. ... flowing either into the Atchafalaya Basin or Lake Pontchartrain. ... A map of Harvey's rainfall over ...
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 ...