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Message
re: Ascension Parish new home construction - required to dig a pond for displacement purposes?
Posted on 10/20/17 at 9:26 am to NYNolaguy1
Posted on 10/20/17 at 9:26 am to NYNolaguy1
quote:
t's not like your lack of a retention pond is causing more water to fall out of the sky.
No, but that's not the point. The issue is that building a house affects the "A" component of that equation.
1
Posted on 10/20/17 at 9:31 am to Booyow
quote:
No, but that's not the point. The issue is that building a house affects the "A" component of that equation.
Wouldn't the "C" portion of that equation be changing, and not the "A"? We are not changing the quantity of area before and after development.
My larger point was that this discussion is independant of whether the property is in a flood zone. Every property everywhere will have to do something to lower peak discharge following a rain storm, whether it be simply having it go into a storm sewer, go into a dry well, or go into a retention/detention pond, and being emptied by some sort of water control method.
Posted on 10/20/17 at 9:34 am to TDsngumbo
This is partially true. You’re only allowed to bring in so much fill dirt. Don’t recall exact amount. Maybe 36”. This was passed right before I built my house a few years ago. We circumvented the process. I bought my lot but my builder paid for the dirt work. Then I sold him the lot to build the house. Dirt work was competed prior to requesting the building permits.
Posted on 10/20/17 at 9:35 am to NYNolaguy1
More mosquitoes to spray.
Posted on 10/20/17 at 9:37 am to TDsngumbo
Building a house always seems like such a headache.
Posted on 10/20/17 at 9:44 am to Adam4848
quote:
It's based on the watershed of the entire neighborhood to receive whatever additional runoff occurs from the development of houses, roofs, roads etc...
The pond acts as a storage area either permanent or temporary to hold water before it is discharged to main feeder water ways.
well, i don't know if the pond had anything to do with it but, during the flood last year, our street didn't even hold water.
Posted on 10/20/17 at 9:46 am to Taxing Tiger
quote:
This is partially true. You’re only allowed to bring in so much fill dirt. Don’t recall exact amount. Maybe 36”
Interesting. I'd imagine I'm going to need to build up more than 3' but who knows. I believe the elevation is somewhere around 6 1/2 feet. Homes adjacent to the location are built up probably 1 1/2 feet and received 16 inches in August 2016.
Posted on 10/20/17 at 9:50 am to NYNolaguy1
quote:
Right, but that has zero to do with whether the house is in a flood zone.
True, I was more so answering his question if "every house needed a retention pond"
quote:
Thats standard practice for any land development, but having a system like this in placr generally doesnt affect if your in a flood zone. It's not like your lack of a retention pond is causing more water to fall out of the sky.
Again, correct. No one can control what comes out of the sky.
Posted on 10/20/17 at 9:53 am to MorbidTheClown
quote:
well, i don't know if the pond had anything to do with it but, during the flood last year, our street didn't even hold water.
That's good to hear, what main water way were you near?
Posted on 10/20/17 at 9:54 am to TDsngumbo
Not sure about AP, but you're probably required to capture the first 1" of rainfall (or some other small amount) in the footprint of your house. Typically this is accomplished by building a small swale / ditch around the perimeter of the yard, and is minimally noticeable if graded properly. Of course the size of your house relative to lot size dictates how noticeable it will be.
Posted on 10/20/17 at 10:02 am to Adam4848
quote:
what main water way were you near?
good question. Hwy 621 between 44 and airline. What's around there?
Posted on 10/20/17 at 10:17 am to MorbidTheClown
quote:
we have one of these at the end of our street. But, didn't know you needed one for every house. maybe they calculate the amount of space each house takes and multiply by that?
On larger lots it's fairly common. See Mallard Lakes in Baton Rouge as an example.
Posted on 10/20/17 at 10:37 am to MorbidTheClown
quote:
what main water way were you near?
good question. Hwy 621 between 44 and airline. What's around there?
Grand Goudine Bayou and Bayou Narcisse run through that area
Posted on 10/20/17 at 10:38 am to Tigeralum2008
quote:
Grand Goudine Bayou and Bayou Narcisse run through that area
thanks for the info. lived here 11 yrs never thought to ask.
Posted on 10/20/17 at 10:42 am to TDsngumbo
Currently have one under construction in a flood zone in AP. We weren’t required to do that
Posted on 10/20/17 at 10:44 am to TDsngumbo
Flood mitigation is a confusing topic that half the engineers don't understand. You must dig a pond but it must have freeboard. Meaning the water surface must be below the natural ground. You must create an equal amount of air volume for the volume of air you are filling below the base flood. There must be an outfall pipe that keeps the water surface at an elevation that provides that flood storage amount. I can give you my company contact info if you really need to speak to someone.
Posted on 10/20/17 at 11:18 am to LSUengr
Posted on 10/20/17 at 11:41 am to tehmidget
quote:
LINK
You may find some of your answers here.
VERY helpful. Not sure why I didn't see that in my research but thanks!
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