Dredging is the removal of debris and debris from the base of lakes, rivers, harbors, and other water bodies. Vessels require a certain quantity of water in order to drift and not touch bottom. This water depth proceeds to increase with time as bigger and bigger ships are deployed. Dredging is also executed to decrease the exposure of fish, wild animals, and people to impurities and to avoid the spread of contaminants to other areas of the water body. This ecological dredging is often necessary since sediments around cities and industrial parks are regularly infected with a variety of pollutants. NOAA's Office of Response and Restoration plays a significant role in protecting and bring back marine natural resources when ecological damages takes place. The U. S. Army Corps of Engineers issues permits for the disposal of dredged material; the U. S. Environmental Protection Agency provides oversight and authorization for the disposal of dredged materials.
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