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Louisiana gets final funds for massive $3 billion Mid-Barataria Sediment Diversion

Posted on 3/9/23 at 8:40 am
Posted by dewster
Chicago
Member since Aug 2006
25286 posts
Posted on 3/9/23 at 8:40 am
It's not without controversy, but this is overall a big net gain for the people of south Louisiana.

quote:

Louisiana granted final funds for unprecedented coastal restoration project

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Louisiana was granted the final necessary funds Wednesday to build the unprecedented Mid-Barataria Sediment Diversion, with construction expected to start later this year on the nearly $3 billion project aimed at helping slow the land loss devastating the coast.

The last set of funding will come from the National Fish and Wildlife Foundation, which is granting $660 million from a 2013 settlement of federal criminal charges involving the 2010 BP Deepwater Horizon disaster. That means construction of the diversion has climbed to $2.92 billion.

The state Coastal Protection and Restoration Authority said it also is negotiating with the Archer Western-Alberici Joint Venture, chosen in 2018 to build the project, to finalize its cost and when construction will begin. Construction should start this summer, and it is expected to take five years to build.

"Today, we’ve overcome the final hurdle in the funding and approval processes for the Mid-Barataria Sediment Diversion,” said CPRA Chairman Chip Kline. “This approval culminates years of hard work and collaboration in which NFWF has been an instrumental partner to CPRA and are eager to get shovels in the ground and start construction."

Jeff Trandahl, executive director and CEO of the foundation, called the award "the largest single conservation investment in the history of the National Fish and Wildlife Foundation."

“The wetlands in the vicinity of the Mid-Barataria Sediment Diversion were among the most heavily oiled as a result of the Deepwater Horizon Oil Spill and we are pleased to support CPRA’s efforts to continue restoring these vital resources," he said.

The project will release a maximum of 75,000 cubic feet per second of sediment and water from the Mississippi River into Barataria Bay through a 2-mile-long concrete channel near the town of Ironton in Plaquemines Parish.




Posted by Ancient Astronaut
Member since May 2015
32793 posts
Posted on 3/9/23 at 8:42 am to
That’s it?
Posted by cypresstiger
The South
Member since Aug 2008
10561 posts
Posted on 3/9/23 at 8:42 am to
Excellent. Long, long time coming but glad it's happening
Posted by Oilfieldbiology
Member since Nov 2016
37366 posts
Posted on 3/9/23 at 8:44 am to
The idea is to rebuild the marshes with sediment right?
Posted by supadave3
Houston, TX
Member since Dec 2005
30226 posts
Posted on 3/9/23 at 8:46 am to
I find these projects very interesting. I’d love to have a tour of these facilities once they are completed. The size of the projects and amount of water/sentiment affected is very impressive.
Posted by Sgt_Lincoln_Osiris
Baton Rouge
Member since Dec 2014
1077 posts
Posted on 3/9/23 at 8:46 am to
Oyster mafia will be here telling us why this is bad in 3...2...1...
Posted by dewster
Chicago
Member since Aug 2006
25286 posts
Posted on 3/9/23 at 8:46 am to
quote:

The idea is to rebuild the marshes with sediment right?



Correct. This will tap into the deeper, sediment-rich part of the Mississippi and divert sediment into the marsh. Basically they will mimic what happened naturally in a few places on the other side if the river.
Posted by GumboPot
Member since Mar 2009
118496 posts
Posted on 3/9/23 at 8:46 am to
Posted by GumboPot
Member since Mar 2009
118496 posts
Posted on 3/9/23 at 8:51 am to
quote:

The size of the projects and amount of water/sentiment affected is very impressive.




The engineering design challenge is to determine the correct channel geometry to maintain water velocity through the channel so the sediments settle sufficiently downstream of the channel to minimize dredging maintenance.

Posted by member12
Bob's Country Bunker
Member since May 2008
32052 posts
Posted on 3/9/23 at 8:52 am to
If this works, CPRA is going to try a few smaller scale projects in other parts of the state too. Not many places in the world where this is being done.

Louisiana and the Netherlands are kind of leading the way on this out of necessity.
Posted by GumboPot
Member since Mar 2009
118496 posts
Posted on 3/9/23 at 8:53 am to
quote:

Oyster mafia will be here telling us why this is bad in 3...2...1...



It will impact existing oyster beds in the area. People and oysters will just have to adjust, and they will.
Posted by member12
Bob's Country Bunker
Member since May 2008
32052 posts
Posted on 3/9/23 at 8:53 am to
quote:

The engineering design challenge is to determine the correct channel geometry to maintain water velocity through the channel so the sediments settle sufficiently downstream of the channel to minimize dredging maintenance.



And it's not a static target either. The riverbed changes constantly, which means the flow geometry changes all the time.

Impressive if they can make this work.
Posted by TheDrunkenTigah
Baton Rouge
Member since Aug 2011
17302 posts
Posted on 3/9/23 at 8:56 am to
quote:

People and oysters will just have to adjust, and they will.


Sorry about the impending roofing tacks in your tires, me.
Posted by Cosmo
glassman's guest house
Member since Oct 2003
120085 posts
Posted on 3/9/23 at 8:57 am to
1 billion for the project
1 billion for studies
1 billion in kickbacks
Posted by 0x15E
Outer Space
Member since Sep 2020
12552 posts
Posted on 3/9/23 at 8:58 am to


Seems like we could use 2-3 more of these
Posted by el Gaucho
He/They
Member since Dec 2010
52865 posts
Posted on 3/9/23 at 8:59 am to
The feds already awarded a billion of the money to a company to get started asap. I hope Keysha’s Weaves N Sediment LLC knows what they’re doing
Posted by Cosmo
glassman's guest house
Member since Oct 2003
120085 posts
Posted on 3/9/23 at 8:59 am to
They do work

Look at satellite images of Atchafalaya and Wax Lake outlet deltas now vs 1950s

St Mary Parish is the only Parish gaining land.
Posted by GumboPot
Member since Mar 2009
118496 posts
Posted on 3/9/23 at 9:01 am to
quote:


And it's not a static target either.


Exactly.

During low river levels they will have heavier sediments settle in the channel. These sediments will stick in the diversion channel bottom even when the river level is high and the velocities through the diversion channel are high. Over time without maintenance the channel will silt itself in. The "proper" channel geometry is important to minimize the required periodic maintenance and deliver the sediment as far downstream as possible.
Posted by Sgt_Lincoln_Osiris
Baton Rouge
Member since Dec 2014
1077 posts
Posted on 3/9/23 at 9:06 am to
quote:

People and oysters will just have to adjust, and they will.


Exactly. But the oyster fisherman are the only ones pushing back against this. "Not in my honeyhole!"

They're willing to sacrifice their great-grandchildren's future for their own.
Posted by Indefatigable
Member since Jan 2019
25818 posts
Posted on 3/9/23 at 9:12 am to
quote:

Seems like we could use 2-3 more of these

There’s at least one more of this scale in the works, Mid-Breton is a similar structure planned for a little further north and on the east side of the river.
This post was edited on 3/9/23 at 9:13 am
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