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Posted on 5/29/14 at 2:46 pm to LSUBanker
and many like one on 933 have expanded bigger than the retention pond could hold (keystone as they keep adding more and more houses) ...... you see many other subdivisions being built without retention ponds as well
Posted on 5/29/14 at 2:51 pm to tduecen
There are many streams in Ascension that have reached period of record levels in the last 2 days. ie. highest it has been in the last 20-30 years
Could some of this been caused by urbanization... sure. More than likely it is because the event that happened yesterday was a 100 year event.
A lot of rain fell really quickly in parts of Ascension Parish.
Could some of this been caused by urbanization... sure. More than likely it is because the event that happened yesterday was a 100 year event.
A lot of rain fell really quickly in parts of Ascension Parish.
Posted on 5/29/14 at 2:53 pm to tduecen
Most of the retention ponds I saw yesterday were overflowing their banks.
I would imagine the 12" in about 10 hours was more water than they were projected to contain.
Also, there is virtually no work done to improve the drainage in AP, especially northern AP. The canals/drainage ditches are overgrown and will take years to reclear.
Gonzales is fricked right now as well, just went through that dying city and it looked pitiful.
I would imagine the 12" in about 10 hours was more water than they were projected to contain.
Also, there is virtually no work done to improve the drainage in AP, especially northern AP. The canals/drainage ditches are overgrown and will take years to reclear.
Gonzales is fricked right now as well, just went through that dying city and it looked pitiful.
Posted on 5/29/14 at 2:54 pm to ScottieP
quote:
a 100 year event.
Yup. That's what WAFB called it. A once in a lifetime event.
Posted on 5/29/14 at 2:55 pm to fightin tigers
Yeah I drove through and I expected Burnside in front of Park Place to be flooded but it was flooded from the GMC dealership to Buffy's.....
My car couldn't make it and I ended up putting myself in reverse and taking Pupera to get to my destination.
My car couldn't make it and I ended up putting myself in reverse and taking Pupera to get to my destination.
Posted on 5/29/14 at 2:55 pm to crimsonsaint
quote:If you raise the elevation of a tract of land above it's natural grade in a low-lying area, then it's going to impact the capacity of the surrounding land to hold and/or convey water. Think of it as dropping an ice cube into a cup of water.
How do subdivisions being built higher cause flooding?
Most places require that you offset fill volumes below the base flood elevation with an equal amount of excavation below the BFE. Ascension requires it; Livingston currently does not.
Ascension's problem is that it has multiple hydrologic factors working against it...flat terrain, fine-grained soils, frequent storms. Throw in the explosion of development over the past 20 years, and there's your problem. EBRP has these same issues, but Ascension is flatter, on average.
Yes, most new developments require detention basins, but bear in mind that those things are designed in keeping with theoretical rainfall distributions and assumed tailwater conditions. It's the best that we have to work with, but it still leads to a lot of imprecision. I love hydrology, and have dedicated my life's work to it, but I'll be damned if it isn't just a bunch of fricking voodoo. Einstein once said that he would never be a hydrologist or a biologist because there are no precise equations. I've never been convinced that localized storage basins are truly effective during periods of extended rainfall. There must be some centralized solutions, but they are expensive as shite and will always involve land acquisitions.
Posted on 5/29/14 at 2:56 pm to tduecen
quote:
Theories on causes? I know I've witnessed several areas that I had never seen flood, well flood. Sure it rained a lot but it rained a lot during Katrina, it rained a lot that year Highland as closed, etc and I had never seen it flood like this.
2.5 years ago was this bad. I walked in 1-2 feet of water to make pizza deliveries. Of 44 a run on Old Hickory was worst. I walked 200 yards in about 2 feet of water to get to a customer. Many many roads closed with police blocking a lot of them.
This may be a tad worse but not much. Just seems like people flipping out about it more this goaround. And honestly I recall Spanish Lake being WAY higher(almost up to Bluff Road in some spots) than this year. Lets see how weekend plays out.
The same issues causing it as before. They have shitty drainage system and neighborhoods being build in these areas that should be elevated but aren't.
This post was edited on 5/29/14 at 3:00 pm
Posted on 5/29/14 at 2:56 pm to tduecen
quote:
causes?
Democrats...
Posted on 5/29/14 at 2:57 pm to geauxjo
quote:The 100-yr rainfall total for this region is 12.6" in 24hrs. If it was 12" in 10hrs, then holy shite...there's nothing that can handle that. I didn't think it was nearly that bad. EBR only seemed to get about 3"-4", which is still a lot.
Yup. That's what WAFB called it. A once in a lifetime event.
Posted on 5/29/14 at 3:00 pm to crimsonsaint
quote:
How do subdivisions being built higher cause flooding?
Check out the Mossy Oaks subdivision under construction in Gonzales on Babin Road. It's brand new and between Babin Rd and Hwy 74. Before they build the subdivision there, I heard from locals that the same plot of land would have 3, 4, even 5 feet of water in areas after a huge heavy rain event such as the one we just experienced.
They had to build the land up for the subdivision, for obvious reasons. Most of the houses there are out of the flood zone because of the build-up of land.
That water has to go somewhere when it rains 13 inches in 12 hours. Yesterday saw all homes in that area become islands for the first time ever, according to people who live in that immediate area. The waterlines on my way home yesterday in that area were astonishing, as I've never seen the water get that high there before.
When areas get built up for subdivisions and other development, the water that usually pools up there has nowhere to go but into people's homes. It's simply a case of overcrowding in Ascension Parish and the local government is trying its hardest to keep up but it's impossible. As soon as they figure it out, things change and they have to start all over again.
Ascension Parish = great schools but lots of flood risk
Posted on 5/29/14 at 3:00 pm to Grit-Eating Shin
quote:
The 100-yr rainfall total for this region is 12.6" in 24hrs. If it was 12" in 10hrs, then holy shite...there's nothing that can handle that. I didn't think it was nearly that bad. EBR only seemed to get about 3"-4", which is still a lot.
Maybe the storm I'm talking about was more isolated but just as heavy b/c some areas that aren't flooded this time were underwater but seems more widespread this week.
Posted on 5/29/14 at 3:00 pm to geauxjo
quote:
A once in a lifetime event.
No. That's not how that works. Also, this was a little less than a 100-yr event. My charts show 13-14 inches as being a 100-yr 24-hr event. This post was edited on 5/29/14 at 3:01 pm
Posted on 5/29/14 at 3:01 pm to Grit-Eating Shin
Lower Livingston Parish has had it bad as well. Just my theory, but I think it has a lot to do with development upriver (Amite). It also has a lot to do with building of additional flood control structures downriver (New Orleans area). The natural flow of water is being funneled into a smaller area. It takes it longer to disperse, so large rains make it rise quicker than it can be dispersed causing flooding.
Posted on 5/29/14 at 3:02 pm to tduecen
quote:
but it rained a lot during Katrina
different type of rain and I don't remember it raining that hard from any of the hurricanes we have had...tropical storms are a different story.
Posted on 5/29/14 at 3:03 pm to BayouBrawl
Livingston did it to themselves. They currently have no fill restrictions within the special flood hazard areas, so the base flood elevation has risen consistently, and the breadth of the flood zones has increased. Sheer, unabated idiocy. 
Posted on 5/29/14 at 3:03 pm to BayouBrawl
I mean 44 and 42 were underwater in some areas that I had never seen before
Posted on 5/29/14 at 3:04 pm to TDsngumbo
quote:
Ascension Parish = great schools but lots of flood risk
That's why it never fails, you see a stand-alone house off the main roads and the builder(usually the owner) made damned sure it was elevated. That's why so many houses look like they're on a hill.
Look at these close to Bayou Manchac. Funny.
Trailers on hill off 42
Posted on 5/29/14 at 3:05 pm to mikelbr
Look at the new huge arse house on 933/Roddy/Severio RD.... That thing is at least 5ft above the surrounding land....
Posted on 5/29/14 at 3:06 pm to tduecen
Obama
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