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re: Morganza Spillway may or may not open for a 3rd time -- lack of clear info from ACoE

Posted on 2/25/19 at 2:01 pm to
Posted by Mudminnow
Houston, TX
Member since Aug 2004
34166 posts
Posted on 2/25/19 at 2:01 pm to
I guess they'll be raising and lowering max flood height everyday. I guess panic will set in if an estimate comes in around 45 or so.
Posted by TDsngumbo
Member since Oct 2011
45632 posts
Posted on 2/25/19 at 2:04 pm to
The Red River sort of becomes the Atchafalaya River at the ORCS.
Posted by BayouBengal
Member since Nov 2003
28285 posts
Posted on 2/25/19 at 2:04 pm to
quote:

To put it in context, what are some other events in modern history that would be similar to the impact of the MS River changing it’s course and leaving BR and NO and all surrounding areas changed forever?


In 1876 the Mississippi changed course near Vicksburg.



I am sure there have been others and some more recent but this one deals with he Mississippi River and isn't all that far from Baton Rouge.



I also think the Cane River splitting from the Red River is another example. This was definitly influenced by man as it happened due to the removal of the "Great Raft" by Henry Miller Shreveport, the father of the Ratchet City.
This post was edited on 2/25/19 at 2:24 pm
Posted by Duke
Dillon, CO
Member since Jan 2008
36408 posts
Posted on 2/25/19 at 2:44 pm to
quote:

I guess they'll be raising and lowering max flood height everyday.


This.

They add in forecasted rain for the next two days period, so it will vary on that and how much actually falls over the watershead.
Posted by TDsngumbo
Member since Oct 2011
45632 posts
Posted on 2/25/19 at 2:49 pm to
Duke, do you see anything that would point to a higher crest than 43.5 in Baton Rouge?
Posted by Ignignot
Member since Mar 2009
18823 posts
Posted on 2/25/19 at 2:53 pm to
quote:

Duke, do you see anything that would point to a higher crest than 43.5 in Baton Rouge?




That would come down to the forecast precipitation for central US and the midwest, Over the next month.
Posted by GREENHEAD22
Member since Nov 2009
20073 posts
Posted on 2/25/19 at 2:53 pm to
Again, your comprehension skills need work, yes only talking lower plaq.

You're either trolling or fairly dense, either way it would probably be beneficial for you to take a drive down there sometime. Maybe then you will have a clearer picture.
Posted by Ignignot
Member since Mar 2009
18823 posts
Posted on 2/25/19 at 2:54 pm to
Arent they planning a huge barataria bay diversion to be built soon??
Posted by GREENHEAD22
Member since Nov 2009
20073 posts
Posted on 2/25/19 at 2:59 pm to
Off the top of my head I think it's in the next yr or two, JBeam most likely knows for sure.
Posted by Duke
Dillon, CO
Member since Jan 2008
36408 posts
Posted on 2/25/19 at 3:15 pm to
quote:

Duke, do you see anything that would point to a higher crest than 43.5 in Baton Rouge?


That's outside my wheelhouse man. The big picture pattern looks better, but that's got room to change and I'm far from qualified to translate what the current model rainfalls would actually mean.

Models are spread precip wise over the Ohio. GFS puts a decent amount down but the new GFS and Canadian aren't showing anything spectacular. The biggest difference this week is the ridge isn't ever really building in on the west coast as expected but the problematic SE ridge (that's been steering storms to the Ohio valley) isn't prominent either. If that holds, we're more likely to see systems cut across the northern gulf than get forced farther north but it's hard to be sold on any set pattern as we go into March.

So it's wait and see but note it takes a lot more water to raise the level the higher we get.
Posted by mthorn2
Planet Louisiana
Member since Sep 2007
1430 posts
Posted on 2/25/19 at 3:21 pm to
quote:

Arent they planning a huge barataria bay diversion to be built soon??


That's for land re-creation purposes within the barataria bay not for water control measure. That would not be open during high water/emergency events. Bonne Carre and Morganza are the two spillways for emergency water elevations....but there are plenty of control pump structures to adjust flows between Atchafalaya River and Mississippi River. If there is a lot of rainfall in Atchafalaya Basin watershed they will pump water into Mississippi river and vise versa...
Posted by Duke
Dillon, CO
Member since Jan 2008
36408 posts
Posted on 2/25/19 at 3:28 pm to
Bonnet Carre to start opening Wednesday. Initially opening up 38 bays.
Posted by mthorn2
Planet Louisiana
Member since Sep 2007
1430 posts
Posted on 2/25/19 at 3:41 pm to
Article in the Advocate says the Bonnet Carre' has only been open 13 times since 1931. 3 of those 13 has been since 2016....
Posted by TDsngumbo
Member since Oct 2011
45632 posts
Posted on 2/25/19 at 3:47 pm to
It's going to open more often as time goes by due to the increased development across the entire Mississippi River drainage basin. More development = more runoff into the rivers that drain into the Mississippi. Eventually the river will either overtop the levees, break the levees, or destroy the ORCS. Or all of the above.

It's a matter of when, not if.
Posted by Jim Rockford
Member since May 2011
102463 posts
Posted on 2/25/19 at 3:47 pm to
Why not just seal off the Old River outlet? Not saying it would be a good idea, I like the idea that the Atchafalaya is buidling a delta. I'm just wondering if if it would be technically feasible.
Posted by ZappBrannigan
Member since Jun 2015
7692 posts
Posted on 2/25/19 at 3:56 pm to
Everytime I see ORCS, even though I know it's Old River Control Structure, I just imagine thousands of these guys.



Waiting to fight the river.
Posted by JudgeHolden
Gila River
Member since Jan 2008
18566 posts
Posted on 2/25/19 at 4:00 pm to
quote:

Why not just seal off the Old River outlet? Not saying it would be a good idea, I like the idea that the Atchafalaya is buidling a delta. I'm just wondering if if it would be technically feasible.


You would have to build another outlet downriver to keep BR and NOLA from flooding. You are pulling a lot of water off the Mississippi at Old River.
Posted by Y.A. Tittle
Member since Sep 2003
107573 posts
Posted on 2/25/19 at 4:01 pm to
quote:

Why not just seal off the Old River outlet? Not saying it would be a good idea, I like the idea that the Atchafalaya is buidling a delta. I'm just wondering if if it would be technically feasible.




I would imagine the increased flow it would create on the lower Mississippi would overwhelm the existing levee system big time.
Posted by LSUFanHouston
NOLA
Member since Jul 2009
39247 posts
Posted on 2/25/19 at 4:02 pm to
quote:

Again, your comprehension skills need work, yes only talking lower plaq.


Well, many people on this thread have been talking all of South LA. I thought you were in that group.

quote:

You're either trolling or fairly dense, either way it would probably be beneficial for you to take a drive down there sometime. Maybe then you will have a clearer picture.


I live in St. Bernard, I go down there a lot. A lot of times to clear my mind, I'll drive to Venice on a weekend afternoon. Take the Belle Chasse Ferry.

If you read up earlier in the thread, you will find where I said we will likely have to make a tough decision about Plaq south of Belle Chasse in the next 40-50 years. It indeed would be expensive AF and I don't know politically if it's possible. But that area, if you compare the amount of money we spend to protect it vs the economic impact of the area... is closer to even than pretty much anywhere else.
Posted by JudgeHolden
Gila River
Member since Jan 2008
18566 posts
Posted on 2/25/19 at 4:03 pm to
quote:

It's a matter of when, not if.


"One who knows the Mississippi,will promptly aver — not aloud, but to himself — that ten thousand River Commissions, with the mines of the world at their back cannot tame that lawless stream, cannot curb it or confine it, cannot say to it, Go here, or Go there, and make it obey; cannot save a shore which it has sentenced; cannot bar its path with an obstruction which it will not tear down, dance over, and laugh at."

Mark Twain
This post was edited on 2/25/19 at 4:10 pm
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