diversions alone are worthless
Yea there was a profession speaking at the TedX the other day that talked about a few things that would help.
They actually have a program to pump wastewater to the marsh outside of nola, and then make an effort to plant cypress trees in the areas that they used to be in.
The problem with the water is that it gets a higher N count when diversion/wastewater is present due to nutrients.
Nutria like the Nitrogen high plants more than not and they destroy and eat all the young plants, etc.
They are using pvc devices to protect sapling trees
This is who spoke LINK
The page on the project and some helpful links LINK
and the page for the Coalition to Restore Coastal Louisiana LINK
(they have links to articles supporting what some in this thread have been talking about as well.