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re: Judge orders Iberville to stop deployment of AquaDams along Manchac Road

Posted on 5/20/21 at 11:06 am to
Posted by TulaneUVA
Member since Jun 2005
25929 posts
Posted on 5/20/21 at 11:06 am to
quote:

im not in this field but in school i learned that most design standards state any civil work done on a site has to have the same amount of runoff as it did prior to any development. Hence big catch basins on the corner of parking lots, big culverts under streets in neighborhoods, and (the new trends) big lakes in neighborhoods.

While i can totally see EBR not denying permits because this isnt being done, as they have done with traffic (you are supposed to require any new development, build add to the infrastructure to support that development), But at the new EBR neighborhoods being build and blamed for this a little bit of an over exaggeration?


I wish I could find the poster who shared some details on this.

Apparently the standards for water shedding and rain management are a little 'loosey goosey' in terms of what % of rain scenarios you have to be able to contain. So when you have these 500 and 1000 year type of events, these design requirements won't hold. The run off will go downstream.

Additionally, it assumes there is basic upkeep. Over time, these ponds, etc will accumulate silt and reduce capacity. It's extremely expensive to dredge and keep up with and enforcement is done by who? I'll bet $100 that there's a gap in maintenance.
Posted by CarRamrod
Spurbury, VT
Member since Dec 2006
57500 posts
Posted on 5/20/21 at 11:09 am to
quote:

. So when you have these 500 and 1000 year type of events, these design requirements won't hold.
well no shite...... no one designs to 1000 year except the Dutch.
This post was edited on 5/20/21 at 11:10 am
Posted by F73ME
SE LA
Member since May 2018
859 posts
Posted on 5/20/21 at 12:13 pm to
quote:

ver time, these ponds, etc will accumulate silt and reduce capacity.


Capacity is only lost once normal low water level starts exposing dirt. Otherwise, buffer capacity will always be (flood level-low water level)x area, no matter how deep the pond is.
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