Congress directed the corps build a flood protection system to protect south Louisiana from the worst storms characteristic of the region. The corps began developing the storm model in 1959, called the Standard Project Hurricane (SPH). This model was not subsequently adjusted, despite the National Oceanic and Atmospheric Administration (the successor agency to the Weather Bureau) recommending increasing the strength of the model: the Corps did not change its construction plans. The local levee boards retained the role of maintenance once the projects were complete. When authorized, this mandate was projected to take 13 years to complete. When Katrina struck in 2005, the project was between 60-90% complete and the projected date of completion was estimated to be 2015.