The flood crest of 47.87 feet on May 10, is the second highest rise in recent history; the highest being 48.7 feet in 1937. Five counties surrounding Memphis have been declared disaster areas, and the costs of the flooding are expected to approach $1 billion. The Mississippi River crest continues to move south and is expected to occur in the Greenville, Miss. area around May 16 and to finally crest in New Orleans around May 23.
When natural hazards like flooding occur, USGS provides the most recent Landsat data to local emergency managers.
“Landsat imagery is crucial in helping to monitor the flood rate and effects of the flooding in the region, and to aid in the decision making process regarding flood control. Decisions such as closing portions of the Mississippi River to shipping and opening flood gates outside of low-lying New Orleans in preparation [for] the flood wave as it makes its way slowly down the river to the Gulf of Mexico,” said Mark Anderson, Acting Director of the USGS Earth Resources Observation and Science Center.
James Irons, Landsat Data Continuity Mission (LDCM) Project Scientist at NASA Goddard Space Flight Center in Greenbelt, Md. said, “NASA Goddard has managed the development of all the successfully launched Landsat satellites and is currently developing the next Landsat satellite system, the Landsat Data Continuity Mission, in partnership with USGS.” The launch of LDCM is scheduled for December 2012.
Using temotely sensed data is not the only flood monitoring method. The USGS collects river data through its network of about 7,700 stream gauges around the Nation. You can receive instant, customized updates about water conditions, including flooding, by subscribing to USGS WaterAlert.
General flood information is available at USGS Science Features and USGS Flood Information.
The scenes captured by Landsat 5 show the Mississippi River along the state borders of Tennessee, Kentucky, Missouri, and Arkansas. The May 2006 image shows the river before it began to flood. In the May 2011 image, the dark blue tones are water, the light green is cleared fields, and the light tones are clouds.
Source: Rob Gutro, NASA Goddard Space Flight Center
+ NASA Press Release
+ USGS Press Release
+ Earth Observatory images of the flood
+ Mississippi River May 12, 2006
+ Mississippi River May 10, 2011
The world has lost 561 square miles (1,453 square kilometers) of salt marshes over the past 20 years.