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Lake Level

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Lake Level

Post by SunFan on Tue Jul 10, 2018 9:17 am

I see from the lake level web page that we're now at a lake level that was not reached last year until Aug 29th.

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Re: Lake Level

Post by slainte39 on Tue Jul 10, 2018 9:35 am

Thumbs up

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Re: Lake Level

Post by RVGRINGO on Tue Jul 10, 2018 10:08 am

The lake is always 'level', but the elevation of its surface does rise and fall. However, a purist would insist that the surface is never 'level', but actually a curved surface. He would be correct.

Not much to think about today. drunk

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Re: Lake Level

Post by MexicoPete on Tue Jul 10, 2018 11:16 am

I loved your post RV. It is so true.

On a serious note, I sure hope the level keeps on going up as it has so far this year and gets the lake level a little closer to the sea walls or whatever they are called, you know closer to the top of the shore.
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Re: Lake Level

Post by ltollefs on Tue Jul 10, 2018 11:24 am

I'd like to this...



Photo source...

http://www.eltesorodelajumentud.info/asierach.html
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Re: Lake Level

Post by Trailrunner on Tue Jul 10, 2018 12:17 pm

You'd like to what this? Surf!?!
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Re: Lake Level

Post by ltollefs on Tue Jul 10, 2018 3:39 pm

Just how difficult can it be?



...I'd like to see this. Actually both the cow and the flooded pier.
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Re: Lake Level

Post by Smartalex on Tue Jul 10, 2018 3:58 pm

How is the lake level determined? About 100 years ago, they would drop a weighted line from a bridge in Ocotlan to the surface of the lake and measure the difference between the two. The bridge was arbitrarily considered to be the baseline of 100 and the length between the bridge and the water surface was subtracted from 100 to determine the level of the lake relative to the bridge. So if the difference between the bridge and the water was 5.00 meters, the lake level was considered to be 95.00. Well, the bridge is long gone and there now are more sophisticated ways to measure the level of the lake. However, in order to maintain continuity of records over the past 100 years, the old arbitrary baseline and relative level of the lake to that baseline has been retained.
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Re: Lake Level

Post by SunFan on Tue Jul 10, 2018 4:55 pm

Smartalex

Was that a bridge over the Santiago river that eventually flows out to the Pacific?

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Re: Lake Level

Post by Smartalex on Tue Jul 10, 2018 7:39 pm

SunFan, Can't answer your question. I read the historical reference a few years ago...and In Spanish. I remember wondering, like you, exactly where this bridge might have been located.
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Re: Lake Level

Post by slainte39 on Tue Jul 10, 2018 10:44 pm

SunFan wrote:Smartalex

Was that a bridge over the Santiago river that eventually flows out to the Pacific?

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Yes, the old bridge that was the nearest to the source or the outlet from the lake that was the start of the Rio Santiago.  On the old road to La Barca, that was changed a little some years ago.

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Re: Lake Level

Post by cypress on Wed Jul 11, 2018 6:54 am

RVGRINGO wrote:The lake is always 'level', but the elevation of its surface does rise and fall. However, a purist would insist that the surface is never 'level', but actually a curved surface. He would be correct.

Not much to think about today.   drunk
Level has two quite different meanings.

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Re: Lake Level

Post by cypress on Wed Jul 11, 2018 6:56 am

Smartalex wrote:How is the lake level determined? About 100 years ago, they would drop a weighted line from a bridge in Ocotlan to the surface of the lake and measure the difference between the two. The bridge was arbitrarily considered to be the baseline of 100 and the length between the bridge and the water surface was subtracted from 100 to determine the level of the lake relative to the bridge. So if the difference between the bridge and the water was 5.00 meters, the lake level was considered to  be 95.00. Well, the bridge is long gone and there now are more sophisticated ways to measure the level of the lake. However, in order to maintain continuity of records over the past 100 years, the old arbitrary baseline and relative level of the lake to that baseline has been retained.

There are 3 (now maybe only 2) weather stations on the lakeshore where the level is measured daily. They relate the lake level to the old measurement at that bridge.


Last edited by cypress on Wed Jul 11, 2018 6:58 am; edited 1 time in total (Reason for editing : clarity)

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Re: Lake Level

Post by cypress on Wed Jul 11, 2018 7:01 am

SunFan wrote:I see from the lake level web page that we're now at a lake level that was not reached last year until Aug 29th.

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Yes, it has risen more that half a meter this season.

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Re: Lake Level

Post by cypress on Wed Jul 11, 2018 7:58 am

SunFan wrote:Smartalex

Was that a bridge over the Santiago river that eventually flows out to the Pacific?

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Yes. But that part of the Santiago flows nowhere now.

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Re: Lake Level

Post by slainte39 on Wed Jul 11, 2018 10:01 am

If you are referring to overflow from the lake, that rarely ever happens.  just rainy season runoff and tributaries below that outlet source.

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Re: Lake Level

Post by cypress on Wed Jul 11, 2018 11:11 am

slainte39 wrote:If you are referring to overflow from the lake, that rarely ever happens.  just rainy season runoff and tributaries below that outlet source.
The last time water flowed out of the lake was over 40 years ago. In Nayarit where the Santiago river enters the Pacific it is quite large-from streams that enter it along the way.

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Re: Lake Level

Post by Smartalex on Wed Jul 11, 2018 3:25 pm

SunFan: They use a more modern method to determine lake level lake now but the baseline of 100 remains the same whether or not the bridge still exists or whether or not there is outflow to the Rio Santiago. Reread my first post in this thread. I think this is clearly stated.
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Re: Lake Level

Post by Smartalex on Wed Jul 11, 2018 3:42 pm

Cypress: I believe the weather stations you are referring to get their information on the level of the lake from the governmently agency that actually does the measurement. I believe there is a weather station, maintainèd. by that same agency, on Scorpion Island that reports the lake level continuously, probably by monitoring a tethered bouey floating on the lake surface.
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Re: Lake Level

Post by cypress on Wed Jul 11, 2018 5:29 pm

I've been to the weather station near me. They have a physical setup to measure the level of the lake-a metal catwalk out into the lake and a ladder down to the vertical measuring board with a metric scale that is based on the 100 baseline. It is a government agency that does this. Maybe that has changed?

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Re: Lake Level

Post by Smartalex on Wed Jul 11, 2018 6:19 pm

That's interesting. Where is this station located? Do they have a website? I'm referring to the government-operated site which had a link posted on the now-closed Chapala Weather site. You could actually watch the lake level rise and fall slightly from moment to moment, as if it were monitoring a bouey floating on the surface. I'll see if I can find the site again and post the link to it here.
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Re: Lake Level

Post by Smartalex on Wed Jul 11, 2018 6:42 pm

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Re: Lake Level

Post by cypress on Wed Jul 11, 2018 7:50 pm


That is the same government agency that runs the weather sites.

Piedra Barrenada


Last edited by cypress on Wed Jul 11, 2018 7:52 pm; edited 1 time in total (Reason for editing : an addition)

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Re: Lake Level

Post by ferret on Wed Jul 11, 2018 8:15 pm

Smartalex wrote:That's interesting. Where is this station located? Do they have a website? I'm referring to the government-operated site which had a link posted on the now-closed Chapala Weather site. You could actually watch the lake level rise and fall slightly from moment to moment, as if it were monitoring a bouey floating on the surface. I'll see if I can find the site again and post the link to it here.

It's not a buoy effect... look at the dates under the heading. About 3 or 4 days worth that keep changing. The highest level is the most recent "todays" level. The lowest is from three or four days ago. It's the same effect that you get when watching the weather satellite in a loop.
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Re: Lake Level

Post by cypress on Wed Jul 11, 2018 8:28 pm

ferret I think you are right. That information and the weather sites come from CONAGUA. Now they show that the level has gone up 67 centimeters.


Last edited by cypress on Wed Jul 11, 2018 8:32 pm; edited 1 time in total (Reason for editing : additional information)

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Re: Lake Level

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