Levees are one of the most traditional and key elements of many flood control and flood management systems. Typically constructed from earth materials adjacent to natural waterways, levees were not usually as well-designed or constructed as other earthen structures, such as canal embankments and dams. However, levees protect billions of dollars of property and the effects of failure can be disastrous, as New Orleans experienced in 2005. The nation has become aware of both the importance and the risks that the thousands of miles of levees across the country pose. GEOTILL has devoted a major portion of its resources to the evaluation, remediation, and improvement of the nation’s flood control levees, and is involved in all engineering aspects in many of the largest active projects.