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Started By
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re: Looks like the magic 1.5 million cfs point at red river guage
Posted on 5/13/11 at 9:50 am to lctiger
Posted on 5/13/11 at 9:50 am to lctiger
Corps may open Morganza Floodway
quote:
NEW ORLEANS, LA – The U.S. Army Corps of Engineers may open the Morganza Floodway, located in Pointe Coupee, LA, as a result of rising river stages and flow rates. The trigger to operate the floodway is when river flows reach a level of 1.5 million cubic feet per second at Red River Landing and are projected to continue rising.
As of 7 a.m. today, the flow at Red River Landing was 1.45 million cfs, and is projected to reach 1.5 million cfs over the weekend. Given current flow rate predictions, which are subject to change, the Corps is anticipating opening the floodway to allow for up to 150,000 cfs of water to pass through the structure at peak flow.
The Corps is monitoring weather conditions and river conditions to determine if operation of the structures is necessary to ensure the safety of the Mississippi River and Tributaries system and the adjacent populated areas.
0
Posted on 5/13/11 at 9:55 am to bayoudude
And it's more complicated than that. The initial opening would be a weir equation.
Posted on 5/13/11 at 10:16 am to LSUJuice
So we are looking at something more like this then..
Qweir = Cd*b*(g)^(1/2)*H^(3/2)
Where H is the blockage height to which the upstream flow is backed up above the weir elevation and b is the crest width and Cd is a dimensionless experimentally determined weir discharge coefficient that varies with the weir geometry, reynolds number and weber number.
Qweir = Cd*b*(g)^(1/2)*H^(3/2)
Where H is the blockage height to which the upstream flow is backed up above the weir elevation and b is the crest width and Cd is a dimensionless experimentally determined weir discharge coefficient that varies with the weir geometry, reynolds number and weber number.
Posted on 5/13/11 at 10:21 am to bayoudude
This reminds me of a joke I heard several years ago.
In a physics class, as part of a homework assignment the professor gave a baseball problem -- given the speed of a pitch (assumed to be a fastball), the speed of the bat, the angle of trajectory off the bat, and the dimensions of the field, would the batted ball result in a home run?
The next day the professor asked if anyone had any questions. A Middle Eastern student asked about the baseball problem, whereupon the professor took 15 minutes to explain all the components.
The professor asked if that answered his question, the Middle Eastern student said no.
"Then what do you need explained further?"
"What is a home run?"
In a physics class, as part of a homework assignment the professor gave a baseball problem -- given the speed of a pitch (assumed to be a fastball), the speed of the bat, the angle of trajectory off the bat, and the dimensions of the field, would the batted ball result in a home run?
The next day the professor asked if anyone had any questions. A Middle Eastern student asked about the baseball problem, whereupon the professor took 15 minutes to explain all the components.
The professor asked if that answered his question, the Middle Eastern student said no.
"Then what do you need explained further?"
"What is a home run?"
Posted on 5/13/11 at 11:09 am to bayoudude
I hope the flooding of LMRV doesn't really depend on equations with more unknown than known variables. Even with flow rate "natural noise" I think the introduction of "smart noise" into the flow rate past and through the ORCS can be extracted to see the impact downstream as levels rise.
Timing changes in the diversion flow so that these can be measured downstream would seem to me to give a more accurate way of predicting necessary future actions as levels rise. The flow/depth at very high levels seems to be the missing factors in performing "calculation based" predictions. Lateral and longitudinal profile seems to be overly complex to "calculate" ultmate peak flow and duraton.
Over my head for sure.
Timing changes in the diversion flow so that these can be measured downstream would seem to me to give a more accurate way of predicting necessary future actions as levels rise. The flow/depth at very high levels seems to be the missing factors in performing "calculation based" predictions. Lateral and longitudinal profile seems to be overly complex to "calculate" ultmate peak flow and duraton.
Over my head for sure.
This post was edited on 5/13/11 at 11:10 am
Posted on 5/13/11 at 11:17 am to Rocketvapor
quote:
Over my head for sure.
I can get the basics but my job is to make things float and not control the rivers they float within
Posted on 5/13/11 at 11:21 am to bayoudude
actually may surpass 1.5 million today. Latest reading is 1.49 mil cfs at red river. Hope they are greasing up the equipment.
Posted on 5/13/11 at 11:27 am to xenon16
quote:
What do you think C represents in the relativity equation?
Is this sarcasm? The C is a Constant. In this case, it just happense to represent velocity.... In hydraulic equations, velocity is simply v. C represents various coefficients, such as the runoff coefficient in the Rational Method: Q=CiA.
quote:
The corp has said NOLA is in trouble if Morg is not opened to 300k cfs LINK
Yeah, this is based on the worst-case scenario maps someone posted in one of the other threads.
Posted on 5/13/11 at 11:34 am to LSUJuice
quote:
Is this sarcasm
Yes, it was prolly the reason C was velocity on wik
This whole 25+ ft of water in my house is starting to freak me out a little
Posted on 5/13/11 at 11:51 am to Rocketvapor
Yes it is. Here's my non expert opinion. All that water got really backed up and caused the levels to rise quickly. The river has been flowing very fast around here lately and the levels are high upstream. The elevation difference is causing the river to speed up and get to the gulf quicker, slowing the rate of rise.
Could be pure bs, but it makes sense to me.
Could be pure bs, but it makes sense to me.
Posted on 5/13/11 at 11:54 am to Big McLargeHuge
maybe "C" isn't constant :)
Posted on 5/13/11 at 12:01 pm to Big McLargeHuge
Could be related to opening the Bonnet Carre too. Less overall pressure drop since some flow is being diverted to the Lake. I'm sure there are a bunch of variables but the Bonnet Carre is one of them. Water level has dropped a bit at NOLA too.
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