My guess is that the water will not rise any further. Everything below sea level is under water, and the water in NO is even with the water in Lake Ponchartrain. Canel street is about at sea level, rising to five feet in the last few blocks near the river, although the topo maps are 20 years old, and NO may have sunk a bit.
If what I say is true, dropping sand bags on the breaches in the levees is a waste of time, and asinine.