Impressive and effective.
How about hiring a Dutch Engineering firm experienced in storm surges and floods and dikes and multiple rivers exiting from their territory into the North Sea? This was a question asked of me, not surprisingly, by a Dutch native who moved to Canada as a 10 year old in 1954.
They have 3 rivers which exit into the North See, the Meuse/Maas, the Schelde, and the Rhein/Rijn, and have to manage both coastal waters to maintain fishing and the shellfisheries while keeping the North Sea its storms and its surges under control.
They are also very adept at creating dikes and channels which neither are undermined nor over-topped by the results of both off coastal, and inland storms. Since I was born in 1946 I have a group of National Geographics as gifts from that year that discuss Holland's problems when the Germans flooded their land with sea water. They're still the most densely populated country in Europe, and they have a very successful economy, despite the cost of their sea defenses. Surely, something on the Dutch model makes sense for Louiiana and the Mississippi, and I wouldn't expect it to be any larger or more complex than the Dutch model.
The Dutch I am informed have created not a break water, but an undersea artificial reef made out of concrete tetrahedra which breaks up the storm surge about 1/2 a mile off shore the way the old islands and bayous used to. Average fishing ships just run right over it because it is 8 feet below the water, Regular heavy shipping from Antwerp, Amsterdam and Rotterdam is funnelled out through apertures which can be blocked very quickly rather the way the Thames barrier functions to prevent storm surges in the Thames.
Just a thought, what do you think??