The river has changed course many times over the years. It fills in a area with sediment and then changes course to a easier course filling that area in. Just about everything below I10/I12 is sediment fill from the Mississippi.
This process builds land and supports a eco system we know. By putting levees on the Mississippi we force it to take one course. Look at Louisiana and you will see a long stretch of land the Mississippi has built until it reached the continental shelf. Now all sediment is dumped right off the shelf into deep water so there is no way for it to build new land.
When sediment builds in the river we dredge it and rather than using this sediment we just dump it into the water column where the swift river moves it farther down the river.
One big lobbyist for river levees is the oyster industry. Oysters need salinity.
A city near me did take some action. They were dumping sewage plant water into a river. Since it was a small banked river it was showing high levels of nutrients the tree huggers could complain about. So they built a pipe line several miles long to a swamp area. The fresh water cleanses the swamp pushing out salt water and provides needed nutrients the swamp plants need. But we are talking a thousand acres when we have a entire coast to save.
They say we are losing a land mass equal to a football field a hour; every hour; 24 hours a day due to coastal erosion.
Like I said this is a sore subject for me that really hits home.
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