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Message

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

Posted on 5/23/19 at 5:08 pm to
Posted by ThatMakesSense
Fort Lauderdale
Member since Aug 2015
15206 posts
Posted on 5/23/19 at 5:08 pm to
quote:

The problem is Lakeside and the Stevensville, Pierre Part, Bell River area due to the backwater flooding


Going up 71 through that area at the end of April, water was already on the road.
Posted by Cosmo
glassman's guest house
Member since Oct 2003
126017 posts
Posted on 5/23/19 at 5:08 pm to
Ill meet you at the Hwy 90 Sonic anytime bitch
Posted by ThatMakesSense
Fort Lauderdale
Member since Aug 2015
15206 posts
Posted on 5/23/19 at 5:09 pm to
quote:

Ill meet you at the Hwy 90 Sonic anytime bitch





Fighting on Church St is sacrilege. Meet me at Boiling Madd, bitchboi.
Posted by LSUAngelHere1
Watson
Member since Jan 2018
9686 posts
Posted on 5/23/19 at 5:11 pm to
Not sure if this has been posted yet. LINK

The Avoyelles Today has received news that a secondary man made levee (not the primary levee) has failed in Brouillette.
Here is a post is from Ms.Judy Lachney, Jessie Lachney's wife, I hate to be the one who has to give bad news but I must tell you people living in lower Brouillette and Spring Bayou that the levee in Adam Dupuy's field in lower Brouillette just broke and water is pouring in. This is from my son, Jonathan who is an engineer with DOTD. He and other officials just returned from there and he said it is pouring in.

This means that within two days we will be seeing water. He said the only thing they can do now is get helicopters to drop large sand bags in the breach, hoping this will help. We would also be helped if the river starts dropping SOON. The elevation at this point is 54 feet. This would mean that all low lying elevations will be flooding within a few days. Pray that the river starts dropping SOON. We need a miracle. Wanted you all to know this so you could be prepared. We have contacted the radio station and The Weekly News so they can announce this ASAP. We need to pray for a miracle because this could be very ugly.
Posted by Nado Jenkins83
Land of the Free
Member since Nov 2012
63082 posts
Posted on 5/23/19 at 5:12 pm to
You still cross in vicksburg
Posted by tgrbaitn08
Member since Dec 2007
148031 posts
Posted on 5/23/19 at 5:19 pm to
quote:


Going up 71 through that area at the end of April, water was already on the road.


There are parts of 71 that are completely underwater right now and there are police roadblocks escorting vehicles through.

quote:

ThatMakesSense



If you live in P-Town I probably know you, or you know me
Posted by slackster
Houston
Member since Mar 2009
90087 posts
Posted on 5/23/19 at 5:21 pm to
quote:

The Mississippi river is 3-4 times larger than the Atchafalaya, roughly. If the whole flow of the larger river were allowed to go down the track of the Atchafalaya it would scour the landscape and completely remake the map. No town anywhere along the bank of the current Atchafalaya would survive. We are not talking flooding, we are talking scouring and moving earth and anything in the way of the river would be either silted over or eroded and carried out to sea. Pierre Part isa good distance away from the Atchafalaya channel, but its fate would depend on the meander that the new, larger river would take. If it meanders close to Pierre Part, it will be destroyed. At a minimum the event would certainly put it underwater either for the duration of the flood or possibly indefinitely depending on where the river settles. Every road from east to west would be ripped down by the river. Morgan City would not exist at all. The closest path to be able to get from West Louisiana to East Louisiana would be I-20 from Monroe to Jackson.


That's not how it would work unless it was a catastrophic failure.

The Atchafalaya usually discharges 30% of the Red River and the Mississippi. Mississippi discharges the rest. Supposedly the rivers basically want to switch, with the Atchafalaya handling 70% and the Mississippi handling 30%.

In the project design flood, the Atchafalaya would discharge half of the river while the other half flowed through Baton Rouge. In 2011 at the peak, the Atchafalaya was discharging about 60% of what was flowing through New Orleans and 33% of what was flowing through Baton Rouge, so the plan calls for far more capacity than has ever been used. The Actchafalaya was actually discharging 25% more water in 2011 than the average discharge at New Orleans, so it can handle the bulk of the Mississippi River. Handling it during flooding season is another story altogether.
Posted by slackster
Houston
Member since Mar 2009
90087 posts
Posted on 5/23/19 at 5:25 pm to
quote:

The Avoyelles Today has received news that a secondary man made levee (not the primary levee) has failed in Brouillette.


That story has been updated and corrected - FWIW
Posted by WizardSleeve
Louisiana
Member since Sep 2011
1862 posts
Posted on 5/23/19 at 5:26 pm to
Yeah, I'm talking about the failure to control the river. The catastrophic scenario if the ORCS would fail, maybe if Morganza would fail and allow the channel to switch.

There have been a few academic studies on the outcomes and the one I read by LSU professors stated that the Mississippi would create a new bank out of sediment just downstream of the breach and water would all but cease to flow down the old channel. That means 100% of all red river + mississippi river would go down to Morgan City in the event of permanent river course switching.
Posted by slackster
Houston
Member since Mar 2009
90087 posts
Posted on 5/23/19 at 5:30 pm to
quote:

Yeah, I'm talking about the failure to control the river. The catastrophic scenario if the ORCS would fail, maybe if Morganza would fail and allow the channel to switch.

There have been a few academic studies on the outcomes and the one I read by LSU professors stated that the Mississippi would create a new bank out of sediment just downstream of the breach and water would all but cease to flow down the old channel. That means 100% of all red river + mississippi river would go down to Morgan City in the event of permanent river course switching.


Yeah, if they lost the river there would be no getting it back. The old Mississippi River would silt up in no time. A controlled switch could work, but the amount of dredging required on the Mississippi would be astronomical.

It's a head scratcher that a state with major coastal erosion problems also has major silt problems in its two main waterways. The Atchafalaya in MC is basically dredged year round, and they just pump the silt back into the river for it to silt up at the mouth instead. The actual shipping route below MC is rarely navigable.
Posted by slackster
Houston
Member since Mar 2009
90087 posts
Posted on 5/23/19 at 5:31 pm to
quote:

Yeah, I'm talking about the failure to control the river. The catastrophic scenario if the ORCS would fail, maybe if Morganza would fail and allow the channel to switch. There have been a few academic studies on the outcomes and the one I read by LSU professors stated that the Mississippi would create a new bank out of sediment just downstream of the breach and water would all but cease to flow down the old channel. That means 100% of all red river + mississippi river would go down to Morgan City in the event of permanent river course switching.


Just to add to this, the Atchafalaya and Wax Outlet could handle the Mississippi River 9 months out of the year, but spring time would be an absolute bitch.
Posted by Jim Rockford
Member since May 2011
102519 posts
Posted on 5/23/19 at 5:39 pm to
quote:

The closest path to be able to get from West Louisiana to East Louisiana would be I-20 from Monroe to Jackson


US 84 baw
Posted by jimbeam
University of LSU
Member since Oct 2011
75703 posts
Posted on 5/23/19 at 5:43 pm to
Vicksburg bridge would be a complete shitshow. As would Vidalia walmarks
Posted by S
RIP Wayde
Member since Jan 2007
164657 posts
Posted on 5/23/19 at 5:49 pm to
Frogmore TYFYS
Posted by ThatMakesSense
Fort Lauderdale
Member since Aug 2015
15206 posts
Posted on 5/23/19 at 6:00 pm to
quote:


If you live in P-Town I probably know you, or you know me


I'm the superintendent of Atchafalaya Golf Course.
Posted by tgrbaitn08
Member since Dec 2007
148031 posts
Posted on 5/23/19 at 6:01 pm to
quote:

slackster


Check this out

LINK
Posted by tgrbaitn08
Member since Dec 2007
148031 posts
Posted on 5/23/19 at 6:01 pm to
quote:


I'm the superintendent of Atchafalaya Golf Course.


Oh lawd
Posted by ThatMakesSense
Fort Lauderdale
Member since Aug 2015
15206 posts
Posted on 5/23/19 at 6:03 pm to
quote:

Oh lawd


We appreciate your continued support of the golf course.
Posted by Ponchy Tiger
Ponchatoula
Member since Aug 2004
47756 posts
Posted on 5/23/19 at 6:04 pm to
So if I am understanding this right they sink a barge in the channel almost to the deck. I am assuming they have it pumped down and have filled the cargo tanks with water? They then put corrugated bulkhead from each side to banks. Why not come back and build a permanent structure behind the barge so they can control it in the future and not have to sink a barge every time?
Posted by tgrbaitn08
Member since Dec 2007
148031 posts
Posted on 5/23/19 at 6:07 pm to
quote:

Why not come back and build a permanent structure behind the barge so they can control it in the future and not have to sink a barge every time?



$80mm dedicated to Bayou Chene floodgate
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