Weirs

[Smalls]

Originally Posted by "W"

What I'm saying Wed the salinity was pulled in marsh and was 16 and lake was 7

This is from good source

Yeah, and I'm sitting on my couch in Prairieville and can find the same information. Doesn't take a rocket scientist to figure that out (sorry MG, lmao!).

[Paulox86]

Originally Posted by "W"

Because last time they opened the weirs for 3 days the water never came out of the marsh ,it just went in for 72 hrs straight .

The marsh was already high salinity to start with and marsh was 3ft lower than lake

Freshwater evaporates before saltwater


That is why the marsh behind weirs is now higher than the lake

If the marsh behind the weirs gets is salinity from BL, then how could the marsh get more salty than the body of water supplying salt? Both areas experience evaporation at equal rates. If BL is supplied with more fresh water than the marsh, then maybe. But the gulf is also pumping salt into BL during incoming tides that the marsh does not get.

Anyone else willing to offer a theory?

[Gerald]

Originally Posted by Paulox86

If the marsh behind the weirs gets is salinity from BL, then how could the marsh get more salty than the body of water supplying salt? Both areas experience evaporation at equal rates. If BL is supplied with more fresh water than the marsh, then maybe. But the gulf is also pumping salt into BL during incoming tides that the marsh does not get.

Anyone else willing to offer a theory?

EVAPORATION ......

The marsh is like an enclosed lake, with just a very little in/out flow.

When the water keeps evaporating every day, the salt is left behind and the salinity keeps getting higher.

The water level in the Cameron Prairie [East Cove unit] has been about a foot lower that the average lake level for months now.

[redaddiction]

Originally Posted by Paulox86

If the marsh behind the weirs gets is salinity from BL, then how could the marsh get more salty than the body of water supplying salt? Both areas experience evaporation at equal rates. If BL is supplied with more fresh water than the marsh, then maybe. But the gulf is also pumping salt into BL during incoming tides that the marsh does not get.

Anyone else willing to offer a theory?

Simple high school physics explains it. Because the lake has more volume than the marsh. Equal evaporation but different ratios of water to salt.

Go mix a 5 gallon bucket with salty water. Pour some in a quart container. When the quart is evaporated down by lets say half, it's going to be saltier than the larger container. And the larger container will not have evaporated in half during the same amount of time.

["W"]

Originally Posted by Paulox86

If the marsh behind the weirs gets is salinity from BL, then how could the marsh get more salty than the body of water supplying salt? Both areas experience evaporation at equal rates. If BL is supplied with more fresh water than the marsh, then maybe. But the gulf is also pumping salt into BL during incoming tides that the marsh does not get.

Anyone else willing to offer a theory?

Originally Posted by Gerald

EVAPORATION ......

The marsh is like an enclosed lake, with just a very little in/out flow.

When the water keeps evaporating every day, the salt is left behind and the salinity keeps getting higher.

The water level in the Cameron Prairie [East Cove unit] has been about a foot lower that the average lake level for months now.

Originally Posted by redaddiction

Simple high school physics explains it. Because the lake has more volume than the marsh. Equal evaporation but different ratios of water to salt.

Go mix a 5 gallon bucket with salty water. Pour some in a quart container. When the quart is evaporated down by lets say half, it's going to be saltier than the larger container. And the larger container will not have evaporated in half during the same amount of time.

Do you understand now ???

[redaddiction]

Why aren't there wiers on the intracoastal (northeast) side to let fresh water in when the salinity is too high? DUH!!!! They already have man made canals that were one time open that are closed off now, right on the Intracoastal canal.

[MathGeek]

Originally Posted by redaddiction

Why aren't there wiers on the intracoastal (northeast) side to let fresh water in when the salinity is too high? DUH!!!! They already have man made canals that were one time open that are closed off now, right on the Intracoastal canal.

Flow is a two way street, and the tides and winds would push too much salt the other way. Keeping the intracoastal fresh where it crosses 27 is a very high priority, and much more important than the relatively small mitigating input the fresh water would have in big lake.

[redaddiction]

Originally Posted by MathGeek

Flow is a two way street, and the tides and winds would push too much salt the other way. Keeping the intracoastal fresh where it crosses 27 is a very high priority, and much more important than the relatively small mitigating input the fresh water would have in big lake.

Not if you only open when the intracoastal is higher than the marsh. Or have a large check valve type system where it can only flow one way.

Oh, and there would be no tides when the wiers on the lake are closed anyways. That's when you would let the water in from the other side.

Salinity high = open wier on intracoastal side.

Salinity low = open wier on the lake side.

[MathGeek]

Originally Posted by redaddiction

Not if you only open when the intracoastal is higher than the marsh. Or have a large check valve type system where it can only flow one way. It wouldn't even need to be mechanically opened and closed.

Oh, and there would be no tides when the wiers on the lake are closed anyways.

Maybe, but I wonder if there would be enough fresh from N to S to justify the expense and effort. Unless you have a huge source of fresh water to draw from (like the Mississippi on the E side), then slowing/stopping the intrusion of salt from the Gulf inland seems to be the more promising approach compared with increasing the flow of fresh toward the Gulf (or directing it). Fresh water is a finite, limited resource. The salt in the Gulf is effectively infinite by comparison.

The solution to intrusion is not dilution.

Ultimately, effective barriers are needed.

["W"]

Originally Posted by redaddiction

Why aren't there wiers on the intracoastal (northeast) side to let fresh water in when the salinity is too high? DUH!!!! They already have man made canals that were one time open that are closed off now, right on the Intracoastal canal.

Man c'mon that would make way too much sense to do !!!

Your talking about da Gumberment

[Tjethro85]

Originally Posted by "W"

It's 100% for duck hunters and saving marsh grass , opening the weirs will not do anymore damage than keeping them closed

Keeping closed actually does more damage to the lake and system

Big money duck hunters run the gates and for that , they control the water

That's what I'm screaming

[redaddiction]

Originally Posted by MathGeek

Maybe, but I wonder if there would be enough fresh from N to S to justify the expense and effort. Unless you have a huge source of fresh water to draw from (like the Mississippi on the E side), then slowing/stopping the intrusion of salt from the Gulf inland seems to be the more promising approach compared with increasing the flow of fresh toward the Gulf (or directing it). Fresh water is a finite, limited resource. The salt in the Gulf is effectively infinite by comparison.

The solution to intrusion is not dilution.

Ultimately, effective barriers are needed.

Yeah, I agree with that too. Was just brainstorming some ideas.

[cajun dave]

When and where is this meeting on July 9th? Can attendees ask questions and comment on tne operation of the weirs? Would it do any good?

[MathGeek]

Originally Posted by cajun dave

When and where is this meeting on July 9th? Can attendees ask questions and comment on tne operation of the weirs? Would it do any good?

http://www.ccalouisiana.com/cca11/in...eting-july-9th

[Paulox86]

Originally Posted by "W"

What I'm saying Wed the salinity was pulled in marsh and was 16 and lake was 7

This is from good source

What do these salinity numbers represent? 16 and 7 what? Parts per _______?


Sent from my iPad using Tapatalk

["W"]

Originally Posted by Paulox86

What do these salinity numbers represent? 16 and 7 what? Parts per _______?


Sent from my iPad using Tapatalk

Thousand

[jbert22]

Can't believe that people are so stubborn to believe that the control of the wiers is not for ducks It's a big money game

[Smalls]

Originally Posted by jbert22

Can't believe that people are so stubborn to believe that the control of the wiers is not for ducks It's a big money game

And what experience do you have with it that leads you to this belief?

I have heard this hear-say on this forum for years now, and not once has anyone provided any proof to this idea, not once has anyone provided a name or contact number for someone that does know. I personally know the land managers for 2 of the largest land-holding companies in the Cameron-Creole, and both are first and foremost concerned with the health of that marsh as a whole, and not just for ducks.

So, unless someone can provide proof to the contrary, I have no reason to believe otherwise.

Is the marsh managed for ducks? Sure, but only as part of the holistic management of the marsh. To say any wetland in Louisiana is not managed for waterfowl, especially given the fact that a portion of Cameron-Prairie Refuge is behind those weirs, would be false. But, to say that waterfowl is the ONLY driving force when there are guided fishing trips, alligator hunting, and duck hunting (among other activities) going on back there is plain ignorant.

[Tjethro85]

^^^cameron prairie, not Sabine.

[Smalls]

Originally Posted by Tjethro85

^^^cameron prairie, not Sabine.

My mistake. For some reason I always mix that up.