Before I start, if you have not seen The New Orleans Times Picayune’s interactive graphic of the timeline of the flooding, it’s pretty good: click here (if you are on wkrn.com, go to www.nashvillewx.com).
The hurricane season has been underway for nearly a month now, and The Army Corps of Engineers has been scurrying since last fall to temporarily fix the levee and floodwall system for this season. The plan for this year is to only bring the system back to “pre Katrina” levels. That might not sound good considering what happened, but for most of New Orleans (excluding eastern sections and Chalmette/St. Bernard Parish areas), the levees and floodwalls were never topped by the water. They were tall enough. The levees and floodwalls failed due to bad design.
If you have never read my essay, “Hurricane Katrina and New Orleans…What Went Wrong?” it will bring you up to speed on the levee and floodwall failures.
Microsoft Word version:
http://www.news2wkrn.com/weather/neworleans.doc
Streaming video version at http://www.wkrn.com/news/hurricane-katrina-new-orleans-what-went-wrong
If you have “dial up” or a slow connection try: http://www.news2wkrn.com/weather/archives/2006/03/hurricane_katrina_new_orleansw.html

So what is being done?
The biggest temporary fix is adding gates to the mouths of the drainage canals (17 St. Canal, London Avenue Canal, and Orleans Canal). These gates will be closed if a hurricane threatens, not allowing any storm surge from Lake Pontchartrain to enter them. The breaches in the 17 St. Canal and The London Avenue Canal filled the New Orleans “bowl” with water that made its way all the way downtown to the Superdome. The levees along the lakefront itself held just fine during Katrina.
But the problem is: How will the rainwater be pumped out if the drainage canals are gated off? Since the 1800’s pumping stations have been pumping the rainwater out of the city using these canals. These massive pumping stations are about 2 miles from the lakefront and the long term fix is to move them to the lakefront, building them into the lakefront levee system. But for this year (and probably next year), they remain where they are, meaning that if the gates are closed, the pumps can’t be used unless there are additional pumps at the gates. Well, they are installing pumps, but their pumping capacity will be less than 1/3 of the big pumps. That’s not good enough. New Orleans may be saved from a major storm surge from a breached levee, but homes could have rainwater flood them instead. If you have gutted your house, de molded it, and installed new dry wall, (like many have done) it could all be ruined again, even if it is only 6” of water in your house instead of 6 feet. My parents are thinking about waiting until October before hanging dry wall.

Unfortunately, the situation is much worse for the eastern suburbs east of the Industrial Canal. This includes The 9th Ward, Chalmette, and St. Bernard Parish. Though many of the levees have been repaired, this area is much more vulnerable to an actual storm surge from The Gulf of Mexico to the east. Most people feel that until MRGO (The Mississippi River Gulf Outlet) is eliminated, it will continue to be a conduit to bring Gulf water directly into the eastern parts of the city and directly to The Industrial Canal. This caused flooding in 1965 with Hurricane Betsy, and again during Katrina.