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1
Posted on 5/13/11 at 2:24 pm to SCOTLANDtheBRAVE
You do realize that they don't just flip a switch and all the water comes rushing out at once??
The open it one gate at a time, which is a tedious and time consuming process. All the water will not come rushing out at once. It's going to take a few days to get the gates open.
The open it one gate at a time, which is a tedious and time consuming process. All the water will not come rushing out at once. It's going to take a few days to get the gates open.
Posted on 5/13/11 at 2:26 pm to LSUJuice
Yeah, I don't see sediment build up being a concern. It's not like they are trying ot max out the flow capacity of the structure. I don't know how steep or how far it is from the end of the spillway to the natural ground but the water will be moving on here. It will begin spreading out quickly, but will still be moving with enough speed to not drop a ton of sediment immediately. In fact, I would expect it to pick up a good bit of sediment. Letting all the water burst out at once in a power surge would definitely be more concerning than downstream sediment build up.
FYI, I'm a Water Resource Engineer.
edit:... but I haven't done any modeling in south Louisiana, so there are certain characteristics of the geography that I may not be familiar with.
FYI, I'm a Water Resource Engineer.
edit:... but I haven't done any modeling in south Louisiana, so there are certain characteristics of the geography that I may not be familiar with.
This post was edited on 5/13/11 at 2:28 pm
Posted on 5/13/11 at 2:26 pm to LSUJuice
Not only that, it's not like Morganza is right next to the main flow of the river. This is essentially backwater that has made it's way(through Old River right?) to that big flat open basin. Lots of sediment would have fallen by the time it reached that point.
Posted on 5/13/11 at 2:27 pm to iAmBatman
absolutely . ..but the force behind each opening prevents silting for many miles. if you open the spillway only to have it's outflow side silt up, you both loose the effective power of the diversion, and you create a slow-mo flood to the south . ..you end up with backwater flooding and months and months of water to deal with.
this is not to suggest that opening morganza means we have reached nirvana, just that the corps of engineers isn't the stupidly always reactive force some suggest
this is not to suggest that opening morganza means we have reached nirvana, just that the corps of engineers isn't the stupidly always reactive force some suggest
Posted on 5/13/11 at 2:27 pm to SCOTLANDtheBRAVE
quote:
yes, CNBC is most assuredly a definitive source discussing something they call the ATchaff-a-lay-yah river.
at 1 pm they said they were the only news team live at the Morganza Spillway.
Saracasm font is needed.
Posted on 5/13/11 at 2:29 pm to LaBR4
Guy from the Corps this morning said it would be a gradual release. 100% fact.
Posted on 5/13/11 at 2:31 pm to Franktowntiger7
yes gradual . ..in the sense they won't open every damn gate at once . ..but they will make sure the pressure on the front side of the spillway ensures that as each gate is opened, the power of the torrent flowing through will create a dynamic flow pushing the possibility of silting and sedimentation deeper (and MOST importantly) broader into the basin.
Posted on 5/13/11 at 2:34 pm to SCOTLANDtheBRAVE
quote:
but they will make sure the pressure on the front side of the spillway ensures that as each gate is opened, the power of the torrent flowing through will create a dynamic flow pushing the possibility of silting and sedimentation deeper (and MOST importantly) broader into the basin.
What?
Posted on 5/13/11 at 2:35 pm to glb
it means they keep the slope steep . . .essentially
Posted on 5/13/11 at 2:36 pm to SCOTLANDtheBRAVE
quote:
yes gradual . ..in the sense they won't open every damn gate at once . ..but they will make sure the pressure on the front side of the spillway ensures that as each gate is opened, the power of the torrent flowing through will create a dynamic flow pushing the possibility of silting and sedimentation deeper (and MOST importantly) broader into the basin.
You had me at "torrent."
Seriously, I am still not buying this as the motivating factor, but you are starting to turn me a little bit that it might make a slight difference.
Posted on 5/13/11 at 2:38 pm to SCOTLANDtheBRAVE
Who gives a damn....any sediment buildup will NOT stop the water from flowing thru it. If anything, the water will cut trenches thru the sediment and eventually wash it away.
It is NOT the reason they are waiting. THey are waiting because of all teh slackers that didn't heed the warnings. They will open it slow anyway to allow all the wildlife to escape and reach higher ground. We are in the middle of spring i.e offspring.
It is NOT the reason they are waiting. THey are waiting because of all teh slackers that didn't heed the warnings. They will open it slow anyway to allow all the wildlife to escape and reach higher ground. We are in the middle of spring i.e offspring.
Posted on 5/13/11 at 2:38 pm to JudgeHolden
the best answer to your question is this: are we trying to save btr and new orleans, or are we trying to save krotz springs?
if your answer is the former, my scenario makes total sense. if you buy the latter, no answer makes sense.
if your answer is the former, my scenario makes total sense. if you buy the latter, no answer makes sense.
Posted on 5/13/11 at 2:39 pm to the LSUSaint
quote:
They will open it slow anyway to allow all the wildlife to escape and reach higher ground. We are in the middle of spring i.e offspring.
That is a damn good point. Had not thought of that.
Posted on 5/13/11 at 2:41 pm to JudgeHolden
In the event of an opening, all water and/or gas wells must be sealed and capped to prevent contamination from floodwaters. People also need time to evacuate.
Posted on 5/13/11 at 2:54 pm to JudgeHolden
quote:
That is a damn good point. Had not thought of that.
Heard that a few days ago.....deer and bears were mentioned.....
If your a wildlife person, the magnitude of this could be devestating for some time.
Posted on 5/13/11 at 2:55 pm to JudgeHolden
There is no way sedimentation in the tailwater is a concern of theirs. I mean it would have to deposit like 5 feet of sediment across the mile plus wide floodway channel! And even then they would still be able to ahcieve their targeted flowrate.
Posted on 5/13/11 at 2:55 pm to ricklsu
Many head of cattle is having to be relocated.
Wildlife was a big issue in 73.
Wildlife was a big issue in 73.
Posted on 5/13/11 at 2:56 pm to ricklsu
quote:
In the event of an opening, all water and/or gas wells must be sealed and capped to prevent contamination from floodwaters. People also need time to evacuate.
According to my data, there are no producing wells in the floodway that are not subject to being flooded even when the Morganza is closed. I am pretty sure that they are not holding up opening it based on oil and gas wells.
Posted on 5/13/11 at 2:59 pm to glb
the power of the flow comes from the height differential. if there is 4 feet between the miss and the spillway, you get that sort of falling power. if the height is greater, you get exponentially more power. if the river is allowed to silt on the other side of the morganza spillway, you reduce the effectiveness of it with each foot of sedimentation allowed in the first couple of miles from the river. when you release the beast, you solve the sedimentation problem for many miles and for at least this year's flood (not to suggest it won't cause problems in the flood of 2015).
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