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Bonnet Carre Spillway Opening Next Week
Posted on 2/21/19 at 9:49 pm
Posted on 2/21/19 at 9:49 pm
I was just reading an article on NOLA.com (sorry, no linkee) about the impending opening of the spillway.
Couple of questions:
They mention towards the end of the article that neither Davis Pond nor the Caernarvon diversions will be opened because salinity levels are already too low. I know the salinity level has a huge impact on oysters, but is that the driving for here? It seems a shame to miss out on the sediment laden flow. (I'm assuming high volume flow carries a correspondingly high volume of sediment.
The article also mentions that they'll be monitoring and trapping endangered sturgeon in the spillway. Do they haul these back upstream?
Couple of questions:
They mention towards the end of the article that neither Davis Pond nor the Caernarvon diversions will be opened because salinity levels are already too low. I know the salinity level has a huge impact on oysters, but is that the driving for here? It seems a shame to miss out on the sediment laden flow. (I'm assuming high volume flow carries a correspondingly high volume of sediment.
The article also mentions that they'll be monitoring and trapping endangered sturgeon in the spillway. Do they haul these back upstream?
3
Posted on 2/21/19 at 11:07 pm to White Roach
quote:
They mention towards the end of the article that neither Davis Pond nor the Caernarvon diversions will be opened because salinity levels are already too low. I know the salinity level has a huge impact on oysters, but is that the driving for here? It seems a shame to miss out on the sediment laden flow. (I'm assuming high volume flow carries a correspondingly high volume of sediment.
Davis Pond and Caernarvon are not sediment diversions they are freshwater diversions. They were never designed or intended to carry sediment, just nutrient rich freshwater to stop saltwater intrusion and provide nutrients for marsh growth.
The driving force for both diversions is salinity levels. There are predetermined lines on salinity (think of a topo line on a map) that both diversions are run on. There is a 5 part line and a 15 part line (as in parts per thousand, ppt) that they try to maintain when the diversions are open. they do not want levels getting lower than these lower limits. Because the river has been so high for so long the guidelines are being met so they do not open the structures.
Hope that answers your question.
Posted on 2/21/19 at 11:39 pm to ScottieP
It does. I knew you knew your stuff from previous flood threads, so I'm happy you responded. I guess I didn't know (or, more likely, didn't remember) that they were strictly fresh water diversions. I thought there was a sediment component involved.
Posted on 2/22/19 at 12:15 am to White Roach
I didn't realize the river was going to get up this high. Few days ago it was just suppose to be "high". Now its something to watch.
Posted on 2/22/19 at 12:26 am to Chuker
I think March 12 was the day they forecasted it to reach flood stage (17') at the Carrollton gage. I'm not sure if the flow rate trigger of 1.25 million cuft/sec will be reached next week or not, but that's when they plan to start opening bays.
Posted on 2/22/19 at 12:36 am to Chuker
quote:
I didn't realize the river was going to get up this high. Few days ago it was just suppose to be "high". Now its something to watch.
I'm in Northssippi and have had probably 8" of rain in the last 24-36 hours and it's supposed to keep raining until Sat. night.
The Ohio river is at or near flood stage around Louisville, KY and they are getting more rain.
This post was edited on 2/22/19 at 12:40 am
Posted on 2/22/19 at 5:44 am to Chuker
It was like 3ft up the levee in Kenner last weekend. I've definitely seen it much higher
Posted on 2/22/19 at 7:28 am to weadjust
Our folks in Nashville are struggling with high water from being dumped on and a super high river. All that water in the mid continent and Ohio Valley will be heading our way. Sounds likely to wipe out the Venice speck fishing again and negatively impact other areas. 
Posted on 2/22/19 at 7:41 am to White Roach
BR gauge projection is 42.5 hitting around 3/11.
That’s high. I think crest in 2016 was 43 something.
Seems like Ms river flooding is getting to be a reoccurring thing every year.
That’s high. I think crest in 2016 was 43 something.
Seems like Ms river flooding is getting to be a reoccurring thing every year.
Posted on 2/22/19 at 7:57 am to TulaneUVA
quote:
Seems like Ms river flooding is getting to be a reoccurring thing every year.
Almost like the river formed thousands of years ago while draining flood waters from most of the US
Posted on 2/22/19 at 7:58 am to TulaneUVA
quote:
BR gauge projection is 42.5 hitting around 3/11.
And its still raining north of us.
Posted on 2/22/19 at 8:21 am to Capt ST
Got an additional 3.5" since midnight and no end in sight until Sat night.
Posted on 2/22/19 at 8:23 am to CypressTrout10
quote:depth of the river is decreasing... which well math is easy...
quote:
Seems like Ms river flooding is getting to be a reoccurring thing every year.
Almost like the river formed thousands of years ago while draining flood waters from most of the US
Posted on 2/22/19 at 8:36 am to Chuker
quote:
I didn't realize the river was going to get up this high. Few days ago it was just suppose to be "high". Now its something to watch.
Don't know how much water yall are gonna get down there, but we are under flood warnings here through Tuesday. All that water is headed your way from here in SW Virginia, Tennessee, Kentucky, western NC. Roads washed out and rock slides on I-81. I expect March will be very high water for the lower Mississippi basin? And this happened yesterday about 40 miles from me: LINK
Posted on 2/22/19 at 9:14 am to White Roach
good
leave it open
leave it open
Posted on 2/22/19 at 9:19 am to ScottieP
(no message)
This post was edited on 2/22/19 at 9:21 am
Posted on 2/22/19 at 9:19 am to TulaneUVA
One of these years the river is either going to overtop levees from BR to NOLA or the levees are going to break somewhere. They’ve only been around since the 1920s and in the grand scheme of things that means they haven’t really been tested that many times yet. Sooner or later catastrophe is going to strike in a perfect setup.
People forget we live on a minor fault line. Imagine if the river is at 43’ or higher in BR and there’s a minor earthquake that weakens the levee.
People forget we live on a minor fault line. Imagine if the river is at 43’ or higher in BR and there’s a minor earthquake that weakens the levee.
This post was edited on 2/22/19 at 9:20 am
Posted on 2/22/19 at 9:36 am to TDsngumbo
Been waiting for this thread. We have one every spring and the doom and gloom starts.
Posted on 2/22/19 at 9:48 am to TDsngumbo
I remember the base blowing out by Farr Park a couple of times several years ago
Posted on 2/22/19 at 9:55 am to Hammertime
Yes. Duncan Point. Thousands and thousands of sandbags were used to prevent failure
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