ADVANTAGES

But guess what! As discussed above, soil in coastal Louisiana continued to subside! In fact, subsidence increased because of the absence of water in the soil and faster decomposition of organic matter. Before the human-made levees, the river would flow over the natural levees and spread out and deposit millions of tons of new soil in coastal Louisiana each spring. It deposited so much, in fact, that the coastal wetlands of the Mississippi River Delta grew and expanded.
Today, the levees prevent the sediment-laden water from reaching the wetlands, and subsidence continues, and the wetlands disappear as land becomes open water. We saved ourselves from floods, but we also directed the valuable sediments away from the coast. We didn't know that our valued levee protection would cause the loss of our coastal wetlands.
We traded periodic river flooding for permanent coastal flooding.

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