re: is it true that the river will wash away sediment when it....

Is already happening in Ms north of Vicksburg. The COE is having to backfill a "slide".. LINK

What is so hard to understand about this? It has nothing to do with the speed of the water in the river. It has to do with the level of the water inside the levee vs level of the water in the river.

It has happened before.

Darrow, La 1983

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Unlike so many people, everything I have said is not opinion based, it is fact based. This photo is a nice demonstration of a FACT.

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Wow...

You can lead a horse to water (so to speak).

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shaunmccarron29

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Since you took the time to do a little homework in your other thread, I'll bite.

The picture above is a result of:

#5 Shear failure (slope instability) of the levee. Manifested as large slabs of the levee sides sliding down the side of the levee during or immediately after high-water. Many days of high water will saturate the surface layers of the levee (by phreatic water movement) making them heavier than the underlying layers. The heavier surface layers lose cohesion with the lower layers, resulting in the surface layer sliding down the slope of the levee. In older levees constructed of sand the entire levee can become saturated during a flood resulting in total collapse of the levee.

This has absolutely nothing to do with "the river washing away sediment" as querried in this thread title.

Lighten up Francis.

while that looks bad, it don't think it was. it looks like while the levee did wash away it still did what it was designed to do keep flood waters out of the low lying areas on the other side of the levee. I hope the same thing would happen here.