im not dont do drainage design 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?

This post was edited on 5/20/21 at 11:05 am

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Posted by goofball

Member since Mar 2015

16904 posts

Posted on 5/20/21 at 11:04 am to CarRamrod

quote:
any civil work done on a site has to have the same amount of runoff as it did prior to any development.

quote:
While i can totally see EBR not denying permits because this isnt being done

EBR and Ascension are doing this, but only in the last 10 years or so.

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Posted by TulaneUVA

Member since Jun 2005

25929 posts

Posted on 5/20/21 at 11:06 am to CarRamrod

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.

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Posted by upgrayedd

Lifting at Tobin's house

Member since Mar 2013

135090 posts

Posted on 5/20/21 at 11:06 am to CarRamrod

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?

Storm water retention ponds are some of the biggest scams of the last 20 years.

During normal periods, they stay a minimum of 3/4 full and all the drainage from the development is piped into them. All the lots are turtlebacked to drain into those stormwater ponds that don't have much capacity before the outfall. Most of the rain water doesn't stay onsite but is essentially moved through a pipeline into the receiving outfall body of water. If they were really that effective, we wouldn't see the problems we see now.

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