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Started By
Message
Ascension Parish new home construction - required to dig a pond for displacement purposes?
Posted on 10/20/17 at 8:34 am
Posted on 10/20/17 at 8:34 am
Yes, another thread by TDsngumbo.
I've heard from two people recently that if I build my home in flood zone AE in Ascension Parish, I must dig a pond to create a place for the water that my house pad displaces. This apparently reduces or eliminates the liability that I as the homeowner would have if my neighbors flood after the construction of my home.
Sounds like BS to me - is this true? I mean, what if the pond is full when flooding takes place? That sort of defeats the purpose. I don't really want a pond in my yard but I'll dig one if I have to. I've looked on the parish website but I can't find much there.
TIA
I've heard from two people recently that if I build my home in flood zone AE in Ascension Parish, I must dig a pond to create a place for the water that my house pad displaces. This apparently reduces or eliminates the liability that I as the homeowner would have if my neighbors flood after the construction of my home.
Sounds like BS to me - is this true? I mean, what if the pond is full when flooding takes place? That sort of defeats the purpose. I don't really want a pond in my yard but I'll dig one if I have to. I've looked on the parish website but I can't find much there.
TIA
This post was edited on 10/20/17 at 8:35 am
14
Posted on 10/20/17 at 8:36 am to TDsngumbo
No idea how this works. But, as an AP resident... I'm here as an interested observer.
Posted on 10/20/17 at 8:40 am to TDsngumbo
I would love to hear from the brain trust that thought this was a good idea.
That doesnt mean what you're hearing is untrue, however.
That doesnt mean what you're hearing is untrue, however.
Posted on 10/20/17 at 8:40 am to TDsngumbo
Wetland Mitigation Banking
Posted on 10/20/17 at 8:42 am to TDsngumbo
Thought it was usually if you had to raise the land, you use dirt from the pond or whatever dirt you bring in has to be offset by pond....no clue though. Always wondered myself
Posted on 10/20/17 at 8:45 am to mctiger1985
I'm glad to know I'm not the only one who thinks this is a dumb rule. If it is indeed a rule.
Posted on 10/20/17 at 8:45 am to TDsngumbo
It’s called a retention pond. In the 17 years that I’ve worked for a general contractor we’ve had to build 3 retention ponds. All on commercial jobs though. Doesn’t mean it doesn’t happen but I’ve never heard of it being done on residential projects.
Posted on 10/20/17 at 8:46 am to TDsngumbo
Did they define what they meant by pond? Did they really mean just leave a hole in the ground proportional to the size of your house pad?
The other thing is that you can't just dig a hole and call it a pond, if you want it to hold water. You have to remove the top soil, which could be several feet, and get to the clay layer. Then you have to use clay from that layer to build up the sides. Have to also be careful not to dig through the clay layer to another layer that will not hold water very well.
The other thing is that you can't just dig a hole and call it a pond, if you want it to hold water. You have to remove the top soil, which could be several feet, and get to the clay layer. Then you have to use clay from that layer to build up the sides. Have to also be careful not to dig through the clay layer to another layer that will not hold water very well.
Posted on 10/20/17 at 8:47 am to crimsonsaint
quote:
retention pond
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?
BTW, people fish in this thing EVERY day.
Posted on 10/20/17 at 8:48 am to TDsngumbo
its for rain retention, not drainage. the point is you build the house up using the soil you dig and don't change the drainage in the area by having the pond retain the rainwater.
Posted on 10/20/17 at 8:48 am to TDsngumbo
Build a moat, win win?
Posted on 10/20/17 at 8:50 am to TDsngumbo
It seems like a lot of people in AP were doing this a few years back. I asked one why and they said it was to get fill dirt to raise the location of the house pad.
Posted on 10/20/17 at 8:53 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?
BTW, people fish in this thing EVERY day.
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.
Posted on 10/20/17 at 8:56 am to NYNolaguy1
quote:
I would love to hear from the brain trust that thought this was a good idea.
Yes my experience is they make a difference and are helpful. Direct experience in my area.
Posted on 10/20/17 at 8:57 am to Adam4848
I would guess that it is cheaper to use your own dirt to get to the required elevation than truck in dirt, and that is where some confusion comes in. I’ve seen several new constructions that didn’t come with associated ponds on the lot.
Posted on 10/20/17 at 8:58 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...
Right, but that has zero to do with whether the house is in a flood zone. What you're describing is more of a function of the existing surface to absorb water- or have it run off. It's the "C" coefficient in the Q=CiA formula for the rational method.
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.
This post was edited on 10/20/17 at 9:02 am
Posted on 10/20/17 at 8:58 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?
Yes, that's exactly what they do. Retention ponds are very common, especially if you have to built the house slabs up to meet flood elevation.
Any new development should absolutely be designed to help the flood plain, not disrupt it.
Posted on 10/20/17 at 8:59 am to BLIZZAKE7
quote:
Wetland Mitigation Banking
Has nothing to do with what the OP is talking about. If you want to build on a piece of property that is classified as wetlands you have to purchase a piece from a wetlands bank to compensate for it.
Posted on 10/20/17 at 9:04 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?
Yeah one for an entire subdivision makes sense. But one pond for one residential lot? Better be a big arse lot or the house and pond aren’t both fitting on it.
Posted on 10/20/17 at 9:06 am to BLIZZAKE7
quote:I recently had a case involving this program. This is not what OP is talking about.
Wetland Mitigation Banking
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