Gentilly, New Orleans lying between the London Avenue Canal and Bayou St. John, fall outside of Gentilly, as do the Lakefront subdivisions of Lake Terrace and Lake Oaks, and the Lakefront campus of the University of New Orleans. Apart from the natural high ground along the Gentilly Ridge and the Lakefront section, itself raised above sea level on man-made land created by a project of the Orleans Levee Board in the early 20th century, Gentilly was badly damaged following Hurricane Katrina. The London Avenue Canal floodwalls were breached in two places by Katrina's storm surge, flooding most of the area. Gentilly's population has
Hurricane preparedness for New Orleans from the Mississippi River. In 1947, the Fort Lauderdale hurricane struck the New Orleans area. There was moderate wind damage. Flood prevention was largely successful in Orleans Parish, but there was severe flooding in the new East Jefferson suburbs near the Lake. Hurricane Flossy in 1956 resulted in flooding in parts of Eastern New Orleans. Hurricane Betsy in 1965 alerted a new generation to the threat posed by major hurricanes. As radar showed the storm heading for the city, a mandatory evacuation of Eastern New Orleans was declared. The Mississippi River-Gulf Outlet Canal channeled storm surge into the metro area.