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USGS reports latest land-water changes for southeastern Louisiana

is reporting that a total of 118 square miles of land has been transformed to new water areas in a 9,742 square mile area from the Chandeleur Islands to the Atchafalaya River. This area encompasses the basins of Breton Sound, Mississippi River, Pearl River, Pontchartrain, Barataria, Terrebonne and the western quarter of the Atchafalaya basin. This land-water change is from the fall of 2004 to the fall of 2005, after Hurricanes Katrina and Rita. These numbers are similar to ones reported to the task force of the Coastal Wetlands Planning, Protection and Restoration Act in November by USGS, but they now also include land-water changes for the eastern quarter of the Pontchartrain basin, including the Chandeleur Islands. The data, acquired by analysis of Landsat 5 Thematic Mapper (or TM) satellite imagery, have also been further verified by additional satellite-image analysis, two small plane overflights, limited field investigations, and peer review. The permanency, however, of the new water areas may not be known for several growing seasons. Some of the shallow areas may recover rapidly while others may remain open ponds. For example, new green vegetation was observed in storm-impacted areas over most of southeastern Louisiana during the small plane overflights. The combined land-water changes caused by Katrina and Rita exceeded all such changes in coastal Louisiana from previous recent hurricanes combined such as Hurricanes Andrew (1992), Lili (2002) and Tropical Storm Isidore (2002), as identified with Landsat satellite imagery. The change from land to water between the fall of 2004 and 2005 in the Breton sound basin was equivalent to 60% of the total land-to-water change in the sound area between 1956 and 2004. Moreover, the change from land to water in all of coastal Louisiana east of the Mississippi River from 2004 to 2005 was 72.9 square miles, exceeding the 60-square miles projected to occur from a period of 50 years (2000-2050) by the Louisiana Coastal Area Ecosystem Restoration Study. The Breton Sound basin's water area increased by 40.9 square miles; Terrebonne basin by 19.4 square miles; Pontchartrain basin by 19.1 square miles; the Mississippi River basin by 17.8 square miles; Barataria basin by 17.6 square miles; and the Pearl River basin by 4.4 square miles. The only area where land did not change to water was the Atchafalaya basin. New water bodies and expanded water bodies formed on the eastern side of the Mississippi River basin; the northwestern …