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Started By
Message
re: Bonnet Carre Spillway to open Thursday
Posted on 3/6/18 at 8:08 am to JetFuelTyga
Posted on 3/6/18 at 8:08 am to JetFuelTyga
quote:
Where are all the global warming bozos now?
What? Rising river heights are due to the rising bed height. It is an alluvial River, this is what happens. Global warming theories have nothing to do with it.
4
Posted on 3/6/18 at 8:10 am to WizardSleeve
We need all that seddiment t on the coast
This post was edited on 3/6/18 at 8:11 am
Posted on 3/6/18 at 8:10 am to bigberg2000
quote:
Anybody have a good map of all of this?
Any satellite view map will work. It's easy to see from above.
If you look towards the LaPlace end of I-10 between I-310 and I-55, you can see the guide levees running back to the river. You should also be able to see the 350 bay gste structure itself.
Posted on 3/6/18 at 8:10 am to bigberg2000
quote:
Anybody have a good map of all of this?
A map of what? You’d be surprised how much info is on the internet with just a simple Google search.
Posted on 3/6/18 at 8:12 am to WizardSleeve
Top 3 or 4 all-time forecast for Natchez
Historic Crests
(1) 61.95 ft on 05/19/2011
(2) 58.04 ft on 02/21/1937
(3) 57.03 ft on 04/23/2008
(4) 56.75 ft on 01/17/2016
(5) 56.70 ft on 05/13/1973
Posted on 3/6/18 at 8:13 am to bigberg2000
Posted on 3/6/18 at 8:19 am to tgrbaitn08
I know I can find it. Just wondering if anyone had a good map of the whole system with diagrams and shite. I will google when I get to the office.
Posted on 3/6/18 at 8:20 am to WizardSleeve
quote:
What? Rising river heights are due to the rising bed height. It is an alluvial River, this is what happens. Global warming theories have nothing to do with it.
Rising bed height is a factor in rising river levels, but the trigger to open the spillways is flow volume - 1,250,000 cubic feet per second in the case of the Bonnet Carre spillway.
Increased runoff due to increased development has got to be a factor. An acre of pasture or agricultural field will absorb much more water than an acre of concrete parking lot.
Posted on 3/6/18 at 8:24 am to bigberg2000
quote:
I know I can find it. Just wondering if anyone had a good map of the whole system with diagrams and shite. I will google when I get to the office.
I'm sure the USACE has a dedicated page to the Bonnet Carre spillway. I know they have a ton of info and diagrams about the Old River Control Structure online.
Posted on 3/6/18 at 8:25 am to Spankum
The Tennessee River here in KY is unbelievably high .
Posted on 3/6/18 at 8:33 am to WizardSleeve
quote:
Global warming theories have nothing to do with it.
Some people think "global warming" is what is making rivers rise. Just making sure. Those people must not be too familiar with the PROVEN scientific process of evaporation. It's like 4th grade science
Posted on 3/6/18 at 8:46 am to bigberg2000
It's not the actual current flows, but it is a diagram of the lower section of the river.
This post was edited on 3/6/18 at 8:48 am
Posted on 3/6/18 at 8:53 am to White Roach
quote:
Increased runoff due to increased development has got to be a factor.
This is part of it for sure. While detention ponds are typically built to mitigate the increased runoff due to development, they will only have a local effect. A detention pond will slow down the timing of the release of water to prevent flooding locally, but the total volume is still increased and is still sent down river.
Posted on 3/6/18 at 8:55 am to LSUJuice
quote:
This is part of it for sure. While detention ponds are typically built to mitigate the increased runoff due to development, they will only have a local effect. A detention pond will slow down the timing of the release of water to prevent flooding locally, but the total volume is still increased and is still sent down river.
And they only work as long as they're maintained. Runoff enforcement usually stops at plan review. That detention basin is useless five years later when it's full of sediment and invasive plants.
Posted on 3/6/18 at 9:02 am to BottomlandBrew
Yeah I'm sure some municipalities are better at enforcement than others. Sucks for New Orleans, but every asshat city upstream all the way to Montana, Minnesota, Pennsylvania has an effect.
They should be looking at historical precip vs river flow to see if it really is due to development. If river height is now higher in the 2000s when compared to similar precip events 50 years ago, then there you go.
They should be looking at historical precip vs river flow to see if it really is due to development. If river height is now higher in the 2000s when compared to similar precip events 50 years ago, then there you go.
This post was edited on 3/6/18 at 9:04 am
Posted on 3/6/18 at 9:20 am to NorthEndZone
So it's predicted as being 5 feet below 2011 levels? That's a flood, but it's not going to be an "OMFG THE MISSISSIPPI IS GOING TO DIVERT!" flood.
Posted on 3/6/18 at 9:35 am to redneck
quote:
Welp, there goes the trestles spring bite
Right... ugh.
Posted on 3/6/18 at 11:59 am to TigerFanatic99
quote:
So it's predicted as being 5 feet below 2011 levels? That's a flood, but it's not going to be an "OMFG THE MISSISSIPPI IS GOING TO DIVERT!" flood.
What if the river bottom has risen 5' since 2011?
There was a study recently published about the rising river bottom in general and and area of extreme shoaling south of the ORCS. I believe the author's name was Hu. The was a big thread about it roughly 2 or 3 months ago. The author was concerned that the flow chokepoint created by the shoaling could compromise the ORCS. IIRC, it was opened in 2011 before it reached its "trigger" flow rate.
His solution was a large scale dredging project or dynamiting the riverbed to move sediment into the water column to be carried downstream. Personally, I think the dynamite option would be much more exciting.
Posted on 3/6/18 at 12:10 pm to nicholastiger
quote:
Just in the last decade it seems the Miss River has been unusually high - hope it's not a trend. Several Bonnet Carre openings. One Morganza opening.
Don't worry... climate change is a hoax.
Posted on 3/6/18 at 12:14 pm to White Roach
quote:
There was a study recently published about the rising river bottom in general and and area of extreme shoaling south of the ORCS. I believe the author's name was Hu. The was a big thread about it roughly 2 or 3 months ago. The author was concerned that the flow chokepoint created by the shoaling could compromise the ORCS. IIRC, it was opened in 2011 before it reached its "trigger" flow rate.
Is this an issue all the way down the river, or does the sentiment tend to pile up there because of the features of the ORCS?
I would imagine part of this is not maintaining the river bottoms and channels, part of this is increased rain/snow events, and part of this is loss of natural drainage due to development which increases runoff.
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