Why do you think the river levies are flooding too? I've not heard that anywhere else?
Reports say they do not know where all the breeches are. The city is covered in water and some of us fear that there may be a breech along the river. In fact, they might not be able to tell if there were a breech there. There's just an awful lot of water and may not only be from the lake.
How else does the flooding get higher than sea level, with the levees into sea level Lake Ponchartrain open?