Levee Info from Army Corps of Engineers - Designed to Category 3?

Checking out the Army Corps of Engineers-New Orleans District site and found this interesting fact sheet for the levee project in the affected area. From what I gather, this is a description of the ongoing project to improve the levee system. Interesting to note that their SPH (Standard Project Hurricane) - what they designed everything to withstand - was a Category 3. Does that mean that they were upgrading things to bring it up to withstand a Category 3? They don't go into any detailed design info or describe their methodology so it's hard to say what 'designing to a category 3' might mean. There is quite a bit of budget info and maps provided as well. This protection (however inadequate in hindsight) does not come cheap.