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Started By
Message
re: Mississippi River Flooding - Links & Pictures in 1st Post
Posted on 5/6/11 at 9:48 am to TheWiz
Posted on 5/6/11 at 9:48 am to TheWiz
LINK
I thought opening the spillway wouldn't have any effect on the river to the north?
Why would this be welcomed news in Vidalia?
quote:
VIDALIA — Water inched its way toward $75 million worth of infrastructure Thursday as Gov. Bobby Jindal toured the Vidalia Riverfront and announced some welcome news.
Jindal said to combat the river levels the U.S. Army Corp of Engineers requested and was given permission to open the Bonnet Carre Spillway located approximately 12 miles from New Orleans. Officials will begin the process at 8 a.m. Monday. The gates were last opened in 2008.
I thought opening the spillway wouldn't have any effect on the river to the north?
Why would this be welcomed news in Vidalia?
This post was edited on 5/6/11 at 9:49 am
0
Posted on 5/6/11 at 9:52 am to DownshiftAndFloorIt
USACE will open up the following diversion canals full throttle to take pressure off the levees:
Davis Pond in St Charles Parish (10,650 CFS)
Bayou Lamoque in Plaquemines (12,000 CFS)
Violet Siphon in St. Bernard Parish (200 CFS)
Caernarvon Diversion in St. Bernard (8,800 CFS)
White Ditch Siphon in Plaquemines (200 CFS)
Naomi Siphon in Plaquemines (200 CFS)
West Pointe A La Hache Siphon (1500 CFS)
Total 33,550 CFS. This is a small amount considering they are talking about 1,600,000 to 2,150,000 CFS possibliy going through the Levee System but they believe this could help relieve the stress a little on the levees North of New Orleans.
The Bohemia Spillway could be a candidate for a intentional levee dynamite if things get worse.
And this may be German but the USACE has increased the flow into the Atchafalaya to the congressionally mandated 30 percent mark. The President COULD declare a national emergency which would allow the USACE to increase the flow above 30% if the situation warrants.
Davis Pond in St Charles Parish (10,650 CFS)
Bayou Lamoque in Plaquemines (12,000 CFS)
Violet Siphon in St. Bernard Parish (200 CFS)
Caernarvon Diversion in St. Bernard (8,800 CFS)
White Ditch Siphon in Plaquemines (200 CFS)
Naomi Siphon in Plaquemines (200 CFS)
West Pointe A La Hache Siphon (1500 CFS)
Total 33,550 CFS. This is a small amount considering they are talking about 1,600,000 to 2,150,000 CFS possibliy going through the Levee System but they believe this could help relieve the stress a little on the levees North of New Orleans.
The Bohemia Spillway could be a candidate for a intentional levee dynamite if things get worse.
And this may be German but the USACE has increased the flow into the Atchafalaya to the congressionally mandated 30 percent mark. The President COULD declare a national emergency which would allow the USACE to increase the flow above 30% if the situation warrants.
This post was edited on 5/6/11 at 9:58 am
Posted on 5/6/11 at 9:53 am to MrLSU
Link for that info MrLSU?
Posted on 5/6/11 at 10:00 am to MrLSU
quote:
The Bohemia Spillway could be a candidate for a intentional levee dynamite if things get worse.
This may have been said already, but where is this?
Posted on 5/6/11 at 10:01 am to MrLSU
quote:
And this may be German but the USACE has increased the flow into the Atchafalaya to the congressionally mandated 30 percent mark
I thought they flowed 30% year round? Do you know what they are currently flowing at?
Posted on 5/6/11 at 10:01 am to Meatloaf
Way down river, in eastern Plaquemines Parish. South of Pointe A la Hache.
Would probably help disperse the sediment load and mitigate silting in the river passes.
Would probably help disperse the sediment load and mitigate silting in the river passes.
This post was edited on 5/6/11 at 10:09 am
Posted on 5/6/11 at 10:03 am to White Roach
What would be the point of blowing that levee way down there?
Posted on 5/6/11 at 10:05 am to Meatloaf
Storage.
Posted on 5/6/11 at 10:10 am to Meatloaf
I'm guessing it would probably help disperse the sediment load and mitigate silting in the river passes. Would also allow the river to fall quicker.
Posted on 5/6/11 at 10:12 am to White Roach
I believe it was running at 25% last week. There is a 5% allowable adjustment the Corps can make on the 70/30 split. Its now at its maximum of 30% as of two days ago.
Posted on 5/6/11 at 10:14 am to MrLSU
quote:
Its now at its maximum of 30% as of two days ago.
I thought I read that they were going to go to 31-32% in the upcoming days. But not anything over that for fear that it would fail.
So 30% is the max allowed?
Posted on 5/6/11 at 10:27 am to Meatloaf
Bohemia Spillway is located on the east bank of the Mississippi River south of Pointe A La Hache (50 miles or so from Chalmette). The Bohemia Spillway levees are already projected to be overtopped by a couple of fee and I believe the when they blew up this levee in 1927 it lowered the flood stage at New Orleans by 2 or 3 feet which would be the point of blowing it up.
Future rainfall is the million dollar question.
One last point that everyone needs to keep an eye on is the the LaBranche Wetlands in St. Charles Parish. It is now a forgone conclusion that the USACE will design a spillway, siphon, or diversion canal in this area in the very near future BUT keep an eye on LaBranche because the USACE is very busy modeling the off chance that this would need to be used for this flood event.
Future rainfall is the million dollar question.
One last point that everyone needs to keep an eye on is the the LaBranche Wetlands in St. Charles Parish. It is now a forgone conclusion that the USACE will design a spillway, siphon, or diversion canal in this area in the very near future BUT keep an eye on LaBranche because the USACE is very busy modeling the off chance that this would need to be used for this flood event.
Posted on 5/6/11 at 10:31 am to Geauxtiga
Posted on 5/6/11 at 10:32 am to MrLSU
quote:
Future rainfall is the million dollar question.
I'd say that if future rainfall might cause them to blow up the Bohemia Spillway, it might be a billion dollar question.
Posted on 5/6/11 at 10:33 am to RummelTiger
quote:
So 30% is the max allowed?
I believe so unless there is a state of emergency declared.
Posted on 5/6/11 at 10:33 am to MrLSU
That seems like that would be literally a last ditch effort. I don't see how that wouldn't obliterate that Shell plant in Norco.
Posted on 5/6/11 at 10:34 am to MrLSU
quote:
USACE will open up the following diversion canals full throttle to take pressure off the levees:
Davis Pond in St Charles Parish (10,650 CFS)
Bayou Lamoque in Plaquemines (12,000 CFS)
Violet Siphon in St. Bernard Parish (200 CFS)
Caernarvon Diversion in St. Bernard (8,800 CFS)
White Ditch Siphon in Plaquemines (200 CFS)
Naomi Siphon in Plaquemines (200 CFS)
West Pointe A La Hache Siphon (1500 CFS)
Total 33,550 CFS. This is a small amount considering they are talking about 1,600,000 to 2,150,000 CFS possibliy going through the Levee System but they believe this could help relieve the stress a little on the levees North of New Orleans.
The Bohemia Spillway could be a candidate for a intentional levee dynamite if things get worse.
And this may be German but the USACE has increased the flow into the Atchafalaya to the congressionally mandated 30 percent mark. The President COULD declare a national emergency which would allow the USACE to increase the flow above 30% if the situation warrants.
this is very good for wetlands....and if the Bohemia is opened up as well....would help tremendously in restoration....
Posted on 5/6/11 at 10:35 am to MrLSU
You have a map of where that water would flow if it the Labranche would be effected?
All my family lives out in St.James, St.John and St.Charles..
All my family lives out in St.James, St.John and St.Charles..
Posted on 5/6/11 at 10:36 am to kfizzle85
Also, if the river is getting within potentially a foot of the top of the leveee, is the Port of NO going to get swamped since its behind the floodwall? I live about 4 blocks from there and I don't think I've ever seen as much stuff piled up there as I have the past few weeks. I mean I can see the boxes from my house now, they're like 150 feet high.
Posted on 5/6/11 at 10:42 am to vl100butch
quote:
this is very good for wetlands....and if the Bohemia is opened up as well....would help tremendously in restoration....
Not really, peer reviewed publications have shown mixed results. Tremendously is an overstatement to say the least. Some have shown to help with marsh restoration and believe it or not some have had a negative impact.
edit: not sure about Bohemia, but a month or two month breach or overtopping will do very little.
This post was edited on 5/6/11 at 10:44 am
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