structurally. However, the city's levee and flood walls designed and built by the US Army Corps of Engineers breached in over fifty locations. Additionally, the levees were built on soil that vary in compression and consolidation rates. Therefore, it is difficult to systematically predict subsidence of the ground under the levees. Storm surge breached the levees of the Mississippi River-Gulf Outlet Canal ("MR-GO") in approximately 20 places and flooded all of Saint Bernard Parish, the east bank of Plaquemines Parish and the historic Lower Ninth Ward. The major levee breaches in the city included breaches at the 17th Street Canal levee, the London Avenue Canal, and the wide, navigable Inner Harbor Navigation Canal, which left approximately 80% of New Orleans flooded. There were three major breaches at the Industrial Canal; one on the upper side near the junction with MR-GO, and two on the lower side along the Lower Ninth Ward, between Florida Avenue and Claiborne Avenue. The 17th Street Canal levee was breached on the lower (New Orleans West End) side inland from the Old Hammond Highway Bridge, and the London Avenue Canal breached in two places, on the upper side just back from Robert E. Lee Boulevard, and on the lower side a block in from the Mirabeau Avenue Bridge. Flooding from the breaches put the majority of the city under water for days, and in many places for weeks. Many roads and buildings were damaged by Hurricane Katrina. In a June 2006 report on the disaster, the U.S. Army Corps of Engineers admitted that faulty design specifications, incomplete sections, and substandard construction of levee segments, contributed to the damage done to New Orleans by Hurricane Katrina. A report released by the American Society of Civil Engineers in June 2007 concluded that two-thirds of the flooding in the city could have been avoided if the levees had held. The failure of the Hurricane Protection Project of New Orleans was the subject of at least two U.S. Senate committee hearings in November 2005. In 2006, the group Levees.org led by Sandy Rosenthal called for 8/29 Commission to investigate both the engineering and decision-making behind the collapse of a flood protection system that should have held against Katrina's storm surge and the Southeast Louisiana Flood Protection Authority-East, which oversees the region's levees, backed the call in 2008. Loss of life Preliminary reports indicate that the official death toll, according to