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Started By
Message
re: 1,800+ East Baton Rouge Parish homes may need to be raised because of 2016 floods
Posted on 5/10/21 at 10:00 am to lsu13lsu
Posted on 5/10/21 at 10:00 am to lsu13lsu
quote:
People completely miss this. They think just adding a pond will take care of it. But, those cow pastures soak up a lot of water. Concrete and rooftops shed it way too fast.
Designed correctly a pond is supposed to offset the fill placed in an area. Now the ponds have to be engineered correctly, maintained and kept to their original size and depth.
2
Posted on 5/10/21 at 10:02 am to Kramer26
quote:
When the Comite Diversion Canal is completed isn’t the base flood elevation going to change for a lot of people? The flood maps would have to be redrawn.
Central, Zachary, and North Baton Rouge maybe. But not so much in Denham Springs or French Settlement. Also the damn thing still isn't complete.
Everything new in Central is built up higher than the stuff build in 1970s-1980s anyways, especially since 2016.
This post was edited on 5/10/21 at 10:06 am
Posted on 5/10/21 at 10:04 am to lsu13lsu
quote:
People completely miss this. They think just adding a pond will take care of it. But, those cow pastures soak up a lot of water. Concrete and rooftops shed it way too fast.
They are retention ponds designed to hold rainwater in flash flooding scenarios to delay at least 80% of the runway long enough for the nearby arterial roads and streets to drain actively.
It's not going to do shite in a backflow situation when the Comite River goes up. Neither will a pasture at that point.
Posted on 5/10/21 at 10:10 am to turkish
quote:
What I recall was that backwater levels rose pretty steadily in the Bayou Manchac system until it got high enough to spill over into Spanish Lake. At that point everything from Burbank area to Hoo Shoo Too area pretty much stabilized.
this is why, had the rain centered over the manchac/Bayou Fountain/Ward's Creek tributary area with the numbers the amite/comite basin area did, flooding would have been much worse in the burbank/nicholson area....
Posted on 5/10/21 at 10:11 am to member12
The government should not be in the business of insuring homes or paying for them to be lifted. 30 trillion in debt and rising….
Posted on 5/10/21 at 10:11 am to lsu13lsu
quote:A lot of older conservatives around here are like that. They're only conservative when it's convenient for them on certain issues but will go full Karl Marx on a handful of issues if it benefits them.
This all day long. I love how Louisiana is so Red and Small Government but loves them some Flood Insurance.
Posted on 5/10/21 at 10:12 am to SantaFe
quote:
History will bite you in the arse if you are not careful. The area of Burbank south of Gardere was once sugar cane fields. The area between Gardere and Lee Dr. was a swamp. The corner at Burbank and Nicholson was an oil field. At flood stage the Mississippi river still tries to find its ' outlet at the Vet school to get into Bayou Fountain, an ancient distributary of the River.
Yeah but that would require a levee break scenario. If the levee broke in Baton Rouge south of the Istrouma bluff, the state would be so fricked that a couple of feet of elevation difference between houses along Burbank wouldn't matter. It's all flooding, and it's going to be a disaster all the way down into Ascension and beyond.
A big reason Bluebonnet/Springlake/U Club didn't flood in 2016 was because the back flow from the Amite River, which went into Bayou Fountain, flowed into the Spanish Lake Basin. The swampy area there retained a lot of the flood waters and gave the watershed time to crest and come back down before it caused real problems for homeowners there.
We need a man-made version of Spanish Lake in St. Helena Parish (Reservoir) to really control the lower Amite River. Something like that is needed to retain some of the flood waters before it causes a problem downstream. Just take the water and hold it long enough to take the edge off of major rain events.
Posted on 5/10/21 at 10:13 am to Limitlesstigers
quote:
A lot of older conservatives around here are like that. They're only conservative when it's convenient for them on certain issues but will go full Karl Marx on a handful of issues if it benefits them.
Most people who call themselves conservative are liberal.
Most people that call themselves liberal are authoritarian progressives.
Posted on 5/10/21 at 10:14 am to tigeraddict
I’m not remembering my geography — would the Spanish Lake spillover not still help those areas?
Posted on 5/10/21 at 10:16 am to goofball
who studies flooding ? civil engineers? army core?
Posted on 5/10/21 at 10:16 am to goofball
quote:
Most people who call themselves conservative are liberal.
Most people that call themselves liberal are authoritarian progressives.
True.
Posted on 5/10/21 at 10:18 am to TulaneUVA
Bayou Paul Rd. washing out saved the Burbank area in 2016. Had that not happened alot of the house along Burbank would have got water. Since then Iberville Parish has been doing what they can to prevent flooding in St. Gabriel while developers build on every piece of land they can find on Burbank.
Posted on 5/10/21 at 10:20 am to TulaneUVA
quote:
Burbank in 2016 fared ok but I can almost guarantee if that rain comes again, there will be devastation.
Wasn’t it like 22” of rain in 72 hours or something insane like that?
In 2016 the worst of the rainfall was centered upriver from Baton Rouge. A similar circumstance would have a similar result and spare Burbank again, causing backflow into Spanish Lake again.
If that rain was centered over LSU or south Baton Rouge, there would be major flooding along Burbank and pretty much everywhere south of there. There is really no way to build a city to prepare for that kind of water. They can do a lot more to mitigate, but any city would flood in that kind of event. There is no way to completely prevent it. That’s why people need to make sure they have flood insurance and be prepared.
Posted on 5/10/21 at 10:22 am to T
quote:
developers build on every piece of land they can find on Burbank.
Hopefully they are building to a higher finished floor elevation than in the past. Looks like they are, but you are right that some of that area is just naturally prone to some flooding - especially south of Burbank into Gardere.
And they are cramming those houses into those developments in that area. Which I guess makes sense from a lane use perspective if they are confident the area is not flood prone. Seems like they would have to spend a lot of money to build the neighborhoods up a foot or two.
What makes me a little more nervous is the stuff they are building out on Jones Creek/Coursey area. I thought that lane flooded. If they are building the houses up then great. But that would just displace the water to older, lower developments right?
This post was edited on 5/10/21 at 10:25 am
Posted on 5/10/21 at 10:28 am to doubleb
quote:
Designed correctly a pond is supposed to offset the fill placed in an area. Now the ponds have to be engineered correctly, maintained and kept to their original size and depth.
I don't get how a pond is supposed to work unless the pond was kept empty. So, more like a pit.
Posted on 5/10/21 at 10:30 am to member12
quote:
If that rain was centered over LSU or south Baton Rouge, there would be major flooding along Burbank and pretty much everywhere south of there
Yep...that’s why I would never want to live south of Highland Road.
Posted on 5/10/21 at 10:31 am to doubleb
quote:
Designed correctly a pond is supposed to offset the fill placed in an area. Now the ponds have to be engineered correctly, maintained and kept to their original size and depth.
I just don't think we are appropriately accounting for all the variables. How much water did previous land hold and absorb? The water that did run off, how fast did it run off at once? Too much money is involved. Developers, Engineers, Property Taxes for Local Govt.
There are zero checks and balances. Are citizens really going to go hire attorneys and engineers to test every plan submitted? No.
Always follow the Incentives.
Posted on 5/10/21 at 10:37 am to lsu13lsu
quote:
I just don't think we are appropriately accounting for all the variables. How much water did previous land hold and absorb? The water that did run off, how fast did it run off at once? Too much money is involved. Developers, Engineers, Property Taxes for Local Govt.
There are zero checks and balances. Are citizens really going to go hire attorneys and engineers to test every plan submitted? No.
Always follow the Incentives.
It’s a cute attitude but at some point you have to build houses roads and schools. We can’t all live out in tents and move around by horse.
The best you can do is try to keep our wetlands intact (or at least force an exchange policy), and build neighborhoods to retain runoff for flash flooding. Don’t allow developers to build on land that is prone to regular flooding.
We can’t really prepare any neighborhood for an epic flood scenario involving multiple feet of rain in a short period or a levee break.
The precious little vacant land in south Louisiana that is appropriate for development probably to be a little more dense in format rather than sprawling all over the flood plain.
This post was edited on 5/10/21 at 10:41 am
Posted on 5/10/21 at 10:42 am to lsu13lsu
quote:Thank you got thinking of this; I hadn’t. As an H&H civil engineer, I’ll be sure to reconsider these points when designing my projects.
I just don't think we are appropriately accounting for all the variables. How much water did previous land hold and absorb? The water that did run off, how fast did it run off at once?
This post was edited on 5/10/21 at 10:45 am
Posted on 5/10/21 at 10:51 am to member12
quote:
Hopefully they are building to a higher finished floor elevation than in the past. Looks like they are, but you are right that some of that area is just naturally prone to some flooding - especially south of Burbank into Gardere.
I know Meadow Bend came close but avoided the worst of it. Some of the streets in there saw standing water. If any homes in there flooded, it was only a handful.
The newer neighborhood adjacent to that is definitely built up a bit higher.
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