Young, now helping to rebuild three damaged New Orleans canals between the Mississippi River and Lake Pontchartrain, said design drawings show that steel pilings reinforcing the levees should have been driven to a depth of 17 feet below sea level. That does not appear to have been the case, based on preliminary findings by an investigative team led by Louisiana State University civil engineering professor Ivor van Heerden. Using sonar, his tests have shown sheet pilings at the canal went to only 10 feet below sea level. Steve Spencer, chief engineer for Orleans Parish levees, said his agency did the...