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Pearl River flooding, spinoff from OT

Posted on 8/29/22 at 9:26 am
Posted by GREENHEAD22
Member since Nov 2009
19592 posts
Posted on 8/29/22 at 9:26 am
So I have noticed in the last 10 years or so, especially the last 5 or so, that the PR is consistently at flood stage. I could be wrong but I don't remember it constantly being out of it's banks like it is now when I was younger.

What has changed? I am assuming it is having a detriment effect on the timber and habit in PR wma and BC Nwr.
This post was edited on 8/29/22 at 9:30 am
Posted by Manatee
Mandeville
Member since Oct 2011
414 posts
Posted on 8/29/22 at 10:11 am to
So has the Mississippi north of Baton Rouge. They claim that part of the issue is the channel filling in on the lower sections of the river reducing the volume of water the channel can hold basically backing up the water along the delta of MS.
Posted by cdaniel76
Covington, LA
Member since Feb 2008
19699 posts
Posted on 8/29/22 at 10:11 am to
The control structure that was in place where the West and East Pearls conjoin at one point a little North East if Talisheek has failed and it's allowing much more water to divert down the West Pearl than normal. I believe this is why the West is hitting flood stages faster and more often.

Also, the rivers have not been dredged since before Katrina. Many areas are silting in which is restricting flow and causing backup and flooding...

Those are two of my hypothesis, at least...



Posted by Park duck
Sip
Member since Oct 2018
392 posts
Posted on 8/29/22 at 10:19 am to
quote:

So has the Mississippi north of Baton Rouge. They claim that part of the issue is the channel filling in on the lower sections of the river reducing the volume of water the channel can hold basically backing up the water along the delta of MS.




Exactly where do you think all the sediment went when the levee busted in mo in 2011. I promise it didn't go straight out into the gulf of mexico. Read about how much top soil etc was washed off in that area
Posted by GREENHEAD22
Member since Nov 2009
19592 posts
Posted on 8/29/22 at 10:28 am to
Unfortunately that extra flow down the west doesn't appear to be building any additional marsh in the rigolets area.
Posted by TaderSalad
mudbug territory
Member since Jul 2014
24656 posts
Posted on 8/29/22 at 10:39 am to
Improved drainage in developing areas. More water making its way to water ways much quicker than ever before.
Posted by GREENHEAD22
Member since Nov 2009
19592 posts
Posted on 8/29/22 at 10:41 am to
Yea that makes since, wait until the put in the interstate connection through Bush.
Posted by Pepperidge
Slidell
Member since Apr 2011
4312 posts
Posted on 8/29/22 at 1:33 pm to
quote:

The control structure that was in place where the West and East Pearls conjoin at one point a little North East if Talisheek has failed and it's allowing much more water to divert down the West Pearl than normal. I believe this is why the West is hitting flood stages faster and more often.

Also, the rivers have not been dredged since before Katrina. Many areas are silting in which is restricting flow and causing backup and flooding...





Posted by dpier16
Member since Aug 2016
194 posts
Posted on 8/29/22 at 4:29 pm to
it just blew out a few months ago. Going to take a while before marsh is built.
Posted by GREENHEAD22
Member since Nov 2009
19592 posts
Posted on 8/29/22 at 4:46 pm to
Well the Pearl has been running consistently high for years now. The shooting range in under water more times than not.
Posted by cdaniel76
Covington, LA
Member since Feb 2008
19699 posts
Posted on 8/29/22 at 5:44 pm to
quote:

The shooting range in under water more times than not.



Not completely true. The range itself doesn't flood. It's the bridge over Indian Bayou at the entrance to the range that floods and causes us to have to close. The range, itself, is nearly 10ft above the grade of the bridge.

But I understand your statement. It is definitely true that we've had to close for high water a good bit more in recent years than years prior.

Also, The WMA website says the range closes when the Pearl River gauge gets to 16ft, but I've been noticing in recent years that it starts overtopping the bridge more closer to 15.5ft.
Posted by TrueTiger
Chicken's most valuable
Member since Sep 2004
67863 posts
Posted on 8/29/22 at 6:02 pm to
quote:

but I've been noticing in recent years that it starts overtopping the bridge more closer to 15.5ft.



It was only about 8 inches below the top yesterday.
Posted by dandyjohn
Member since Apr 2009
804 posts
Posted on 8/29/22 at 8:24 pm to
quote:

What has changed?


Lots of things, but primarily:

1. More development means less water getting into the ground and thus more runoff into rivers.
2. Changing weather patterns.
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