When the Mississippi River rose to near record levels in 2011, the U.S. Army Corps of Engineers (Corps) intentionally broke several levees along the river, thereby flooding normally protected areas in order to prevent greater damage elsewhere. The 2011 Mississippi River floods brought renewed attention to federal liability for floods, which has been the subject of ongoing litigation since Hurricane Katrina. Some of these structures were part of the federally authorized Lake Pontchartrain and Vicinity Project (LPV), constructed by the Corps and maintained by local levee districts. By August 31, 2005, 80% of New Orleans was under water. In other instances, like that of the 2011 Mississippi River flooding, the Corps may flood certain lands in order to reduce damage to other areas. This report examines the legal issues resulting from flood damage in both instances. It analyzes the general framework of liability claims for flood damage and federal government immunity under the Federal Tort Claims Act (FTCA) and the Flood Control Act of 1928 (FCA). The report specifically analyzes claims for federal liability for damage caused by Katrina. Sovereign immunity means that the government cannot be sued. Flood Control Act of 1928

Even if litigants are able to refute the discretionary function exception and sue the government under the FTCA, the FCA offers additional immunity to the federal government. Levee Failure and Hurricane Katrina Flooding

In the aftermath of Katrina, numerous legal claims were filed against the government for flood damage. The legal defenses available to the federal government depend on the facts underlying the specific flooding incident. Failure of the Hurricane Protection System

With respect to the failure of the Hurricane Protection System in New Orleans, a central question has been whether the design of the levees and floodwalls was exceeded or whether they were poorly designed, constructed, or maintained. However, any documented choice involving prioritization would likely be considered a discretionary action, exempting the government from liability. Floodway Operation and Immunity Under the FTCA and FCA

The focus of legal challenges related to the 2011 Mississippi floods has focused on the Corps' authority with respect to the MRTP and the sufficiency of floodway easements. In the case of the 2011 floods, the waters causing damage are clearly floodwaters that were diverted through the floodway as a primary facet of the MRTP, one of the nation's largest flood control projects.
Over the past century, the federal government has undertaken a number of civil works projects to prevent widespread damage from flooding of various waterways. These flood control projects generally have been designed and constructed by the U.S. Army Corps of Engineers (Corps). Despite the existence of these flood control structures, floods have caused major damage to various regions of the country. Hurricane Katrina was the most costly natural disaster ever to hit the United States. Striking land in August 2005 as a Category 3 hurricane, Hurricane Katrina left 80% of New Orleans under water. Since Katrina, a number of major floods in the midwestern states have caused significant damage. In particular, heightened flows of the Mississippi River in 2011 have resulted in historic flooding and controversy over the use of floodways to redirect floodwaters. In the wake of these floods, the issue of federal liability for flood damage is receiving attention in the media and in Congress.
The costly and unprecedented nature of recent flood damage has led to an upsurge in litigation over flood damage liability. Some lawsuits filed against the federal government, particularly after Katrina, assert government liability for damages resulting from the failure of levees and floodwalls designed and constructed by the Corps. Other lawsuits claim federal liability for damages resulting from the Corps' decision to activate floodways during the 2011 Mississippi River flooding.
The Federal Tort Claims Act (FTCA) and the Flood Control Act of 1928 (FCA) may protect the government from liability for some flood-related claims. Under the FTCA, the federal government is exempt from liability for discretionary actions. Under the FCA, the government cannot be sued for damages resulting from federally supported damage reduction projects or floodwaters.
This report examines federal liability for flood damage and analyzes legal defenses available to the federal government. Specifically, it provides an overview of the discretionary function exemption under the FTCA and immunity under the FCA as applied to Corps projects. The report also considers the Corps' potential liability for damages caused by levee failure during Hurricane Katrina and the activation of floodways during the 2011 Mississippi flooding.