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The average elevation of the city is currently between 1 and 2 feet (0.30 and 0.61 m) below sea level, with some portions of the city as high as 20 feet (6 m) at the base of the river levee in Uptown and others as low as 7 feet (2 m) below sea level in the farthest reaches of Eastern New Orleans.
This is a list of places on land below mean sea level. Places artificially created such as tunnels, mines, basements, and dug holes, or places under water, or existing temporarily as a result of ebbing of sea tide etc., are not included. Places where seawater and rainwater is pumped away are included.
Today, a large portion of New Orleans is at or below local mean sea level and evidence suggests that portions of the city may be dropping in elevation due to subsidence. A 2007 study by Tulane and Xavier University suggested that "51% of the contiguous urbanized portions of Orleans, Jefferson, and St. Bernard parishes lie at or above sea level ...
Hurricane preparedness in New Orleans has been an issue since the city's early settlement because of its location. New Orleans was built on a marsh . Unlike the first two centuries of its existence, today a little under half of the modern city sits below sea level .
Gert Town is one of the points of lowest elevation in New Orleans, currently ranging from 0 to −4 meters below sea level. [11] According to geographer Richard Campanella, "vertical migration" patterns, based on topographical elevation, appeared to have a specific effect from 1920 to 2000 in New Orleans. There is no evidence suggesting that ...
During both moderate and severe floods of the Mississippi, the Bonnet Carré Spillway can also be opened to help protect New Orleans, many parts of which are below sea level. The Bonnet Carré Spillway, built after the Great Mississippi Flood of 1927, is located well downstream of Morganza, where the Mississippi River approaches Lake ...
New Orleans was founded in 1718 by Jean-Baptiste Le Moyne, Sieur de Bienville, along the high ground adjacent to the Mississippi River (about 17 feet (5.2 m) above sea level). The city struggled early on with rainfall drainage because of the topography of the region.
New Orleans is at or below sea level, resulting in a high water table in the soil. If a body or coffin is placed in an in-ground tomb in New Orleans, there is risk of it being water-logged or even displaced from the ground.