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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 6/3/19 at 5:35 pm to slackster
Posted on 6/3/19 at 5:35 pm to slackster
They really need to open up the Morganza spillway to help replenish the lakes, streams, rivers, and bayous with fish. The LaWLF can then use their resources to stock other lakes across the state. 
0
Posted on 6/3/19 at 5:41 pm to slackster
quote:
Because it doesn't really have an impact that far upstream.
Spillways only help places immediately upstream (Madrid/Cairo, for example) and obviously downstream.
My thought was downstream and storm surge. With the river already at 17 feet NOLA and south, even a 2 ft surge up the river could make things really interesting.
Posted on 6/3/19 at 6:20 pm to LSUFanHouston
I understand your line of thinking but a 2 foot storm surge at the coast doesn’t necessarily equate to a 2 foot storm surge in the Mississippi river at New Orleans.
Posted on 6/3/19 at 7:20 pm to PipelineBaw
They are delaying because they know once they open it, it's going to be open for a loooooong time.
Posted on 6/3/19 at 7:30 pm to udtiger
quote:
because they know once they open it, it's going to be open for a loooooong time.
Why do you say that? What makes you think they can't close it when they want to?
(I'm legit asking)
Posted on 6/3/19 at 7:30 pm to udtiger
Anyone know the river level that corresponds to the morganza forebay being flooded? If once opened looking to see what level the river needs to drop back to before the potato levee will keep new water out of the forebay.
Guess next question, is “does the over topping of the potato levee destroy the potato levee. So will the river need to drop even more?
Guess next question, is “does the over topping of the potato levee destroy the potato levee. So will the river need to drop even more?
Posted on 6/3/19 at 7:34 pm to TDsngumbo
quote:
The ACE isn't really being very clear with their decision making.
Well, they're engineers. They aren't exactly known for their social and communication skills. They assume you know what they know.
Posted on 6/3/19 at 7:44 pm to BeepNode
They like to leave the bays open after operation so the water will drain off to the river side as it recedes. This facilitates repairs to the structure and other advantages.
Posted on 6/3/19 at 7:47 pm to tigeraddict
I think it’s upper 40s at RR Landing
ETA- 36.4’ at BR
ETA- 36.4’ at BR
This post was edited on 6/3/19 at 7:56 pm
Posted on 6/3/19 at 7:51 pm to tigeraddict
quote:
Anyone know the river level that corresponds to the morganza forebay being flooded? If once opened looking to see what level the river needs to drop back to before the potato levee will keep new water out of the forebay. Guess next question, is “does the over topping of the potato levee destroy the potato levee. So will the river need to drop even more?
I think they blow up the potato levee long before it is overtopped.
Posted on 6/3/19 at 7:53 pm to JudgeHolden
quote:
think they blow up the potato levee long before it is overtopped
Im adding this to the list of things I want to see
Posted on 6/3/19 at 8:00 pm to tigeraddict
quote:
Anyone know the river level that corresponds to the morganza forebay being flooded
Here are some installed gages installed on both sides now. The structure obviously is not open now but when it does you should be able to see the difference in water level on both sides.
morganza fore bay
morganza tail bay
Posted on 6/3/19 at 8:01 pm to nicholastiger
quote:
Sure are quick to open Bonnet Carre which Miss hates but they want to avoid the Morganza at all costs?
Hmm!
This battle with Mississippi highlights the needs for more diversion projects like the Davis Pond project. Divert on the other side of the river and build up the marshland.
Posted on 6/3/19 at 8:11 pm to LSUFanHouston
quote:
My thought was downstream and storm surge. With the river already at 17 feet NOLA and south, even a 2 ft surge up the river could make things really interesting.
Reasonable thought, but I wonder how it would work out practically. The Mississippi River @ New Orleans rose 2 feet from that relatively minor Hurricane Nate in 2017, so it is subject to storm surge that far upriver. However, the Bonnet Carre is already open with 48% of the bays open (168 of 350) and at 56% of project flood capacity (140k cfs of 250k cfs capacity), despite New Orleans being below flood stage right now. Not sure they have any obligation to do much more.
Posted on 6/3/19 at 8:20 pm to LSUFanHouston
quote:
My thought was downstream and storm surge. With the river already at 17 feet NOLA and south, even a 2 ft surge up the river could make things really interesting.
The levee in Nola is nowhere near being close to being topped. A tropical storm sure isn't going to change that.
What could be a problem is if the storm comes in from the west and the water is high in that area because of the Morganza being open.
Whatever their reason for not opening it now, I'm sure it's a good reason.
This post was edited on 6/3/19 at 9:05 pm
Posted on 6/3/19 at 8:59 pm to JudgeHolden
quote:
I think they blow up the potato levee long before it is overtopped.
Pretty sure that is not correct. I think you’re thinking about the Birds Point-New Madrid fuse plug levee.
I’m not sure whether overtopping destroys the potato levee, as the head differential is probably pretty small.
Posted on 6/3/19 at 9:23 pm to FutureMikeVIII
Perhaps to drain it? I was in a duck lease that hunted both sides of spillway. I don’t remember anything about them blowing levee, just when it got to X’, water was going to flood forebay.
Posted on 6/3/19 at 9:29 pm to PipelineBaw
quote:
I thought they said earlier that if the structure is overtopped they would be unable to operate the bays?
And from that you should be able to deduce that the danger of overtopping the structure is less now than it was a week ago.
Posted on 6/3/19 at 9:40 pm to JudgeHolden
quote:
I think they blow up the potato levee long before it is overtopped.
If there is water in the fore bay in Morganza, the potato levee is under water. The potato levee is designed to be topped without being destroyed.
Posted on 6/3/19 at 9:43 pm to Capt ST
They use the sluice gates to drain the forebay.
From Standing Instructions
Edit: This report mentions that
But it doesn't really say what that means. At any rate, the potato levee is obly 5 or 6 ft tall, it looks like, so I dont think blowing it up is necessary, would be pretty sweet, though.
quote:
The two 5.5 foot square sluice gates may be operated to drain the forebay area if it is flooded by rainfall or by river stages overtopping the potato ridge levee separating the forebay from the river.
From Standing Instructions
Edit: This report mentions that
quote:
the water control plan calls for degradation of the potato ridge prior to operation of the MCS
But it doesn't really say what that means. At any rate, the potato levee is obly 5 or 6 ft tall, it looks like, so I dont think blowing it up is necessary, would be pretty sweet, though.
This post was edited on 6/3/19 at 10:01 pm
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