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re: How years of storm water pond construction are causing issues in Baton Rouge metro area
Posted on 9/14/21 at 9:36 am to goofball
Posted on 9/14/21 at 9:36 am to goofball
quote:
This is why IMO they should basically be more of a giant catch basin that drains entirely when it's dry, but holds more of the development's runoff when it rains.
It's easier to maintain when there isn't sitting water in it. That's an added benefit.
A better way these neighborhoods can do it is to make the detention areas usable areas that can occasionally flood. Make it common park space the community uses and maintains.
This post was edited on 9/14/21 at 9:37 am
2
Posted on 9/14/21 at 9:38 am to BottomlandBrew
whats also really difficult is in south Louisiana the water table is so high detention ponds just retain water. this isnt a area where soil just absorbs water because it is already saturated.
Posted on 9/14/21 at 9:41 am to BottomlandBrew
I think in Louisiana (at least), the lot sizes, greenspace and pond requirements just need to be greater. Whatever measurements they are using to guide them just are not working.
The problem with the silt is that engineers and developers will say Pool Level is perfectly fine with the silt and vegetation. The problem with the silt and vegetation is it is like seeing a cockroach or rat at a restaurant. Maybe it is nothing and a one off or most likely it is a indicative of what is behind the walls and in the kitchen.
The problem with the silt is that engineers and developers will say Pool Level is perfectly fine with the silt and vegetation. The problem with the silt and vegetation is it is like seeing a cockroach or rat at a restaurant. Maybe it is nothing and a one off or most likely it is a indicative of what is behind the walls and in the kitchen.
This post was edited on 9/14/21 at 9:46 am
Posted on 9/14/21 at 9:42 am to CarRamrod
quote:
CarRamrod
bro, stop wasting your time. Most either dont care and are just looking for someone to blame or are too dumb to understand.
besides your just a dumbass engineer who is part of the problem.
Posted on 9/14/21 at 9:44 am to CarRamrod
But we just need a pond that is full part of the time after it rains!
Posted on 9/14/21 at 9:45 am to lsu13lsu
quote:
I have an open mind and willing to learn. I am guessing you are not that way.
So much misinformation in this thread as is typical of the uninformed trying to understand detention. Here is a simple exhibit, not MS Paint unfortunately.
What happens below the static water surface has no bearing on the storage capacity of the pond. So this article, as is typical, was a giant waste on everyones time. A wet pond uses the storage above the water surface to the top bank, known as the freeboard. The pond stores runoff in that volume so that the peak runoff leaving the site is no greater than when the site was undeveloped. Unless the silt/muck goes above the water surface, the storage capacity of the pond is unchanged. That case is different for dry storage.
Posted on 9/14/21 at 9:47 am to CarRamrod
quote:
I have an open mind and willing to learn. I am guessing you are not that way. you cant read people either.
Im glad you are willing to learn, but you seem to be just blaming people just because. should engineering and contractors be required to design an build a house that will resisted a cat 5 storm? if so, your 250k house will be 500-750k.
lsu13lsu makes a valid point, and I don’t believe anyone is saying the houses should be *required* to resist Cat5 storms; however, the title of the post is also an obviously valid and growing problem.
Moving forward, I believe Engineers and contractors ought to design these homes/developments with more respect shown to the long-term consequences.
Poor design that leads to flooding and consequently financial damages or loss of life, either due to engineering/contracting or downstream by neglect of the Maintenance laid out in the engineering plan, ought to be grounds for legal action against them: not unlike negligent design of bridges, other construction, etc.
Sucks, but that is the only way this situation will change IMO.
Posted on 9/14/21 at 9:50 am to Warfox
Okay let’s go with that. If the HOA doesn’t perform the maintenance, what good is whatever an engineer specifies ahead of time?
Posted on 9/14/21 at 9:52 am to goofball
That’s the smartest thing Chauna Banks has ever said
Posted on 9/14/21 at 9:54 am to CarRamrod
quote:
storm water pond constructions isnt causing these issues
You're wrong, though. The ponds are only designed to manage between a 4% and 10% annual probability event. Beyond that, they absolutely allow the development to increase discharge into our streams. We've seen 2 events under 0.2% annual probability in the last 5 years. We see multiple 1% events each year. Until Atlas 14 is updated in about a year, we're going to see that the design storms are pretty grossly underestimated.
We are rapidly altering the hydrology of the parish with all the development. Unfortunately, the developers are going to push back hard against the needed reforms, and capitalism will defeat common sense once again.
Posted on 9/14/21 at 9:55 am to jimbeam
quote:
Okay let’s go with that. If the HOA doesn’t perform the maintenance, what good is whatever an engineer specifies ahead of time?
As we have said, no one is disagreeing with that. This is one problem. But, Developers are turning this over to stay at home moms with no engineering or maintenance experience. it isn't in the Developers reserves or accounting or budgets. What do these developers think will happen? They know what will happen so they don't have HOA dues at the right level or these expenses in the budget with a Special Assessment lined up to happen every five years because it will hurt their sales.
Posted on 9/14/21 at 9:58 am to lsu13lsu
I’m sure an engineer and a contractor would love to have a maintenance contract with an HOA but then all those stay at home moms will bitch about how expensive it is.
This post was edited on 9/14/21 at 10:45 am
Posted on 9/14/21 at 9:58 am to goofball
If they left them dry it wouldn’t look as nice but it would function a lot better and last a little longer.
Posted on 9/14/21 at 10:00 am to LSUengr
quote:
The pond stores runoff in that volume so that the peak runoff leaving the site is no greater than when the site was undeveloped.
For a very specific scenario. And far too much voodoo engineering is going into their modeling. Firms often do extremely inadequate validation and calibration of their models, as they are more interested in giving their client, the developer, the answer they need for approval than giving them the correct answer.
They also use the soil that was removed from the bottom of the pond to build up the land around the pond to meet base flood requirements. This meets "no net fill" ordinances, but reduces net storage volume by that exact same volume below the water surface.
Posted on 9/14/21 at 10:02 am to BeepNode
quote:
If they left them dry it wouldn’t look as nice but it would function a lot better and last a little longer.
There is some maintenance value in having a small amount of water in the bottom to ward off woody vegetation, but you don't need them 12 feet deep for that. The developers build them deeper to give themselves more access to onsite fill.
Posted on 9/14/21 at 10:04 am to Galactic Inquisitor
quote:
Until Atlas 14 is updated in about a year, we're going to see that the design storms are pretty grossly underestimated.
This is another good point about the frequency data. A lot of the existing infrastructure was designed with frequency data from TP-40, which had a publication date in 1961.
Posted on 9/14/21 at 10:05 am to BeepNode
quote:
If they left them dry it wouldn’t look as nice but it would function a lot better and last a little longer.
You guys keep repeating this and it is still wrong. It doesn't matter what happens below the water surface.
Posted on 9/14/21 at 10:05 am to goofball
how does this effect black people? if it doesn't BR Proud leadership does not care.
Posted on 9/14/21 at 10:07 am to LSUengr
It’s no use man.
Posted on 9/14/21 at 10:08 am to jimbeam
quote:
I’m sure an engineer and a contractor would love to have a maintenance contract with an HOA but then all those stay at home mom’s will bitch about how expensive it is.
Then why don't they put it in the budget/reserves and have Dues priced accordingly?
they don't want that bc it would hurt their home sales.
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