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re: Is there a backup for the Old River control structure?
Posted on 2/15/22 at 9:11 am to bayoudude
Posted on 2/15/22 at 9:11 am to bayoudude
quote:
think overtopping and scouring will one day lead to it’s failure. Not because floods are getting worse but the silting downstream is causing higher water levels for the same flow
Silt that used to leave the river and get deposited on adjacent land is now forced to stay in the river.
Dredging picks it up and kicks it downstream a bit.
That’s a never ending relationship.
1
Posted on 2/15/22 at 9:13 am to Meauxjeaux
quote:
Silt that used to leave the river and get deposited on adjacent land is now forced to stay in the river.
Dredging picks it up and kicks it downstream a bit.
That’s a never ending relationship.
Every time they open Morganza, they slow the flow south of that point substantially and rapidly.....which results in suspended sediment dropping and building up on the riverbed instead of being carried downstream.
They really need to dredge between Morganza and Baton Rouge, or they will end up having to open up the spillway more often in the future.
Posted on 2/15/22 at 9:17 am to dewster
quote:
or they will end up having to open up the spillway more often in the future.
They already are over the past 10-11 years.
All the housing and urban development upstream (across the entire watershed) is only going to create more and more significant flooding in the decades to come. Unless they do things to keep up with flood control we or our children will eventually see the ORCS catastrophically fail.
Not that most things man does will prevent it. Nature will eventually remind us who is in charge.
This post was edited on 2/15/22 at 9:21 am
Posted on 2/15/22 at 9:23 am to Ignignot
quote:
if the river busts through no one knows if it'll groove a deeper knotch down the current low sill structure channel
The river would relatively quickly form a new, steeper channel towards the Atchafalaya River if it broke through. The soil outside of the Mississippi channel is much softer than that in the channel. At normal water levels, the Mississippi is ~20' above the Atchafalaya. It can be much higher during flood conditions. That's why the fix at low water is way tougher than people are assuming. That new low water level would be the current low water level of the Mississippi channel, which is still a metric frick-ton of water.
Posted on 2/15/22 at 9:29 am to dewster
quote:Thank you Jones Act
They really need to dredge between Morganza and Baton Rouge, or they will end up having to open up the spillway more often in the future.
Posted on 2/15/22 at 9:39 am to BottomlandBrew
quote:
At normal water levels, the Mississippi is ~20' above the Atchafalaya
I didn’t know that. Is that true or are you making shite up on the spot?
If true, that makes the thought of the ORCS failing that much more concerning. No way they’d be able to tame it enough to rebuild. Odds are they’d have to find a new area to build it. But where? Would there even be another place that would be feasible?
For the record, this topic has always intrigued me. Of course hopefully it never happens but it surely will eventually.
This post was edited on 2/15/22 at 9:42 am
Posted on 2/15/22 at 9:49 am to TDsngumbo
Going by memory. Looks like I was a incorrect. 17-19' foot difference at bed elevation.
Source
quote:
Thus, the difference in elevation between the bed of the Mississippi and the Atchafalaya—currently about 17 - 19 feet at typical flow rates of the rivers
Source
This post was edited on 2/15/22 at 9:50 am
Posted on 2/15/22 at 11:06 am to BottomlandBrew
Still, that’s a big difference.
Posted on 2/15/22 at 11:10 am to The Boat
quote:
When the river is low enough it’s leveed and doesn’t even interact with the spillway structure.
You do realize that if the structure fails at a high water point, the river will take out the levee, concrete and all, and gouge a new river bed.
Not saying they can’t reclaim it, but it’s hardly as easy as you’ll make it sound, like the river will naturally dry up on the alternate course in a month or two.
Posted on 2/15/22 at 12:29 pm to GetmorewithLes
quote:
If conditions get bad enough the Army Corps of Engineers have levee designations to blow so the levees...
No they don't.
quote:
This actually happened a few yrs ago. The ACE blew the levee at Hayti,MO on the Miss River where it was mostly farmland.
That's how that particular spillway was designed. They didn't just blow up a regular levee. It was a fuse levee, which is designed to be the first point of failure. Dynamite is just their version of pulling the pins at Bonnet Carre.
The land that got flooded in MO (I think it's bird something spillway) is similar to the land in the spillway here that still has houses and camps. The corps bought surface/flood rights to all the property ~1950-1970's, yet people still use it/ build on it/ farm it, then complain as if they weren't already paid.
Posted on 2/15/22 at 12:38 pm to John_V
Destroying the country's economy
---California, New York, Illinois and Florida say "Not so fast"
---California, New York, Illinois and Florida say "Not so fast"
Posted on 2/15/22 at 12:43 pm to LSUPHILLY72
That was Shaquille O'Neal's 1st day in Baton Rouge because they had a tornado in Baton Rouge that day.
----I don't follow
----I don't follow
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