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Index » Music » Whatever » Today, I learned... Page: 1, 2, 3 ... 70, 71, 72  Next
Post to this Topic
Bill_J

Bill_J Avatar



Posted: Apr 18, 2023 - 3:57pm

 Proclivities wrote:

Does it work for the insects if they have sinus congestion?  I know this bee who has a terrible chest cold.



I always wondered what that expression, "the bee's sneeze" was talking about.
GeneP59

GeneP59 Avatar

Location: On the edge of tomorrow looking back at yesterday.
Gender: Male


Posted: Apr 18, 2023 - 1:38pm

 Isabeau wrote:


We must Spread the good news. 

Rub    

Isabeau

Isabeau Avatar

Location: sou' tex
Gender: Female


Posted: Apr 18, 2023 - 1:34pm

 Steely_D wrote:

I love this hive employee
Bisected accidentally
One summer afternoon, by me
I love him carnally

Semi-carnally



Exo skeleton love 
Steely_D

Steely_D Avatar

Location: Biscayne Bay
Gender: Male


Posted: Apr 18, 2023 - 1:31pm

 Proclivities wrote:

Does it work for the insects if they have sinus congestion?  I know this bee who has a terrible chest cold.


I love this hive employee
Bisected accidentally
One summer afternoon, by me
I love him carnally

Semi-carnally

Proclivities

Proclivities Avatar

Location: Paris of the Piedmont
Gender: Male


Posted: Apr 18, 2023 - 12:35pm

 Bill_J wrote:

You can use Vicks VapoRub as an insect repellant.  Works for some people (and insects) anyway.


Does it work for the insects if they have sinus congestion?  I know this bee who has a terrible chest cold.

Isabeau

Isabeau Avatar

Location: sou' tex
Gender: Female


Posted: Apr 18, 2023 - 12:02pm

 Bill_J wrote:


To be clear, it does not have to be Vicks brand. The generic works as well.


We must Spread the good news. 
Bill_J

Bill_J Avatar



Posted: Apr 18, 2023 - 5:55am

 lily34 wrote:


ooo this is news to me. bugs love me. i may try this!


To be clear, it does not have to be Vicks brand. The generic works as well.
lily34

lily34 Avatar

Location: GTFO
Gender: Female


Posted: Apr 18, 2023 - 5:09am

 Bill_J wrote:

You can use Vicks VapoRub as an insect repellant.  Works for some people (and insects) anyway.



ooo this is news to me. bugs love me. i may try this!
Bill_J

Bill_J Avatar



Posted: Apr 18, 2023 - 4:07am

You can use Vicks VapoRub as an insect repellant.  Works for some people (and insects) anyway.
islander

islander Avatar

Location: Seattle
Gender: Male


Posted: Mar 15, 2023 - 9:43am

 ScottFromWyoming wrote:


So if you have a 100' weir in a straight line, and the water is 1 inch higher, it will leave the reservoir (spill) at 100 inches per unit of time (second, maybe?).  If you have a 300' weir, it will spill at 300 inches per second. If you make that 300' weir zigzag and accordion it into the same space as the 100' straight weir, it will still spill at about 300" per second.

One of those links I put up somewhere mentions having to run pipes with more water to the downstream side of the weir, and they blast water up to break up that suction/cause turbulence or something to keep the water from backing up.

People rage about dumping runoff into the ocean but the salinization of the delta is a big problem too. 
Some of the levees around there are breaking because they've been so dry for so long (among other reasons). They're building "turnouts" along the San Joaquin and the aqueducts to flood some pretty large acreages to help recharge the aquifer and store water below ground. But the downstream monopolies are going to complain about that too. 


There is a lot of thermodynamics in Laminar and turbulent flow models and equations. It's crazy stuff, and a lot of it is really non-intuitive. Like Kurt's scruffy surfboards and why golf balls have dimples.  One of my physics profs said something along the lines of 'the universe is trying to kill us by sucking out all the heat, and it has plenty of time to wait us out'. 

ScottFromWyoming

ScottFromWyoming Avatar

Location: Powell
Gender: Male


Posted: Mar 15, 2023 - 7:47am

 kurtster wrote:


So if you have a 100' weir in a straight line, and the water is 1 inch higher, it will leave the reservoir (spill) at 100 inches per unit of time (second, maybe?).  If you have a 300' weir, it will spill at 300 inches per second. If you make that 300' weir zigzag and accordion it into the same space as the 100' straight weir, it will still spill at about 300" per second.

One of those links I put up somewhere mentions having to run pipes with more water to the downstream side of the weir, and they blast water up to break up that suction/cause turbulence or something to keep the water from backing up.

People rage about dumping runoff into the ocean but the salinization of the delta is a big problem too. 
Some of the levees around there are breaking because they've been so dry for so long (among other reasons). They're building "turnouts" along the San Joaquin and the aqueducts to flood some pretty large acreages to help recharge the aquifer and store water below ground. But the downstream monopolies are going to complain about that too. 
kurtster

kurtster Avatar

Location: where fear is not a virtue
Gender: Male


Posted: Mar 15, 2023 - 2:17am

 ScottFromWyoming wrote:
I'm also coming to understand the difference between a dam that's mostly for flood control, and a dam that's for hydro or irrigation etc. We see all these images of California reservoirs during the drought, and assume it's terrible. It's not good, but they don't want them to fill up. Our irrigation reservoir in Cody goes over the spillway almost every year, but it's a feature not a bug. They used to crank the outflow down so far that trout were dying—they wanted the reservoir full at all costs. But they eventually passed an in-stream flow minimum, and I think that's standard now. But it still fills up eventually. Hmm now a PK Weir. PK="Piano Keys" Check out the cool one they're building at Lake Isabella 
 
That's pretty cool.  Applying hydrodynamics and surface drag knowledge to influence the water flow.  Similar to how drag works on boat hulls and surfboards.  In the mid 60's we learned about how much the finish on a surface can influence drag.  It was found that a hard shiny finish actually attracted a thicker layer of water than a fine sanded matte finish allowing water to pass more quickly over the surface because of less friction / drag.

This is creating more surface area to affect the water flow by thinning out the overall layer that creates drag that slows it down.  The same volume is spread out over a wider area making it easier to flow if I'm getting this.  Or not.

About California's water system ... Back when it was designed and built under the first Gov. Brown, Jerry's dad, it was never intended to store water for long durations or flooding for that matter.  The primary purpose was to move water from NorCal and the Colorado River into SoCal via aqueducts for immediate use.  Reservoirs  were not a consideration  It was very short sighted as we have come to find out, but then again the population has nearly quadrupled since its design and build.  There is usually plenty of water if managed and properly stored.  But most runs off into the ocean when it storms.  Or worse, diverted to areas less in need for strange reasons found only in California.
haresfur

haresfur Avatar

Location: The Golden Triangle
Gender: Male


Posted: Mar 14, 2023 - 11:08pm

 ScottFromWyoming wrote:


I'm also coming to understand the difference between a dam that's mostly for flood control, and a dam that's for hydro or irrigation etc. We see all these images of California reservoirs during the drought, and assume it's terrible. It's not good, but they don't want them to fill up. Our irrigation reservoir in Cody goes over the spillway almost every year, but it's a feature not a bug. They used to crank the outflow down so far that trout were dying—they wanted the reservoir full at all costs. But they eventually passed an in-stream flow minimum, and I think that's standard now. But it still fills up eventually.

Hmm now a PK Weir. PK="Piano Keys"

Check out the cool one they're building at Lake Isabella 



As a scientist I, of course look down at engineers but that's unfair, especially when it comes to people who are thinking up creative new design principles.

The overlap is when someone thinks they can design around hydrologic and hydrogeologic reality. A geology professor I know pointed out that the reservoirs in Australia for flood control do very little to control floods. Basically, there is no way for them to hold enough water to have much impact on a big flood. Yeah,  they might prevent minor flooding if they are nearly empty but afterall you are in a wet period so they probably aren't. But then the weather forecast says, "Oh Shit!" and you can't dump the water fast enough to empty it and besides more water flows in from the whole catchment than it can hold. But they try to dump water anyway and, guess what? Minor flooding anyway, probably followed by major flooding. He's been right more often than not over the past couple of years.

eta: Used to use V-notch weirs to measure flow down streams by relating water level behind the notch to the amount of water that can flow through the notch. There are other designs but the V is good because you can measure low flows pretty well but as more water comes down it has a larger area to flow through and the rate can be calculated with some complications - because physics. One trouble was that there has to be a free-drop on the downstream side of the weir so the water isn't backed up. That means that the bottom of the weir needs to be set in a little dam and you don't get a measurement until the pool fills up to the notch. I came up with a system to use high-resolution laser topography measurements to calculate the pool volumes at different levels as water rises up to the notch and calculate the inflow. Of course the real problem was the debris caught in the weir and the yabbies (freshwater crayfish) digging tunnels underneath.

ScottFromWyoming

ScottFromWyoming Avatar

Location: Powell
Gender: Male


Posted: Mar 14, 2023 - 6:49pm

 haresfur wrote:


That's pretty cool. I read something recently about some other kind of toothed overflow thingy, maybe for a different situation. Thought, "Nice. Don't understand it really but these civil engineers seem to have fun."

Our local reservoir overflowed this year but the conventional spillway worked. Took out a road downstream (and flooded most of a town). Of course they are repairing the road the same way it was rather than raising the bridge. Mainly because there were a lot of roads damaged and they don't have the money to do it right.


I'm also coming to understand the difference between a dam that's mostly for flood control, and a dam that's for hydro or irrigation etc. We see all these images of California reservoirs during the drought, and assume it's terrible. It's not good, but they don't want them to fill up. Our irrigation reservoir in Cody goes over the spillway almost every year, but it's a feature not a bug. They used to crank the outflow down so far that trout were dying—they wanted the reservoir full at all costs. But they eventually passed an in-stream flow minimum, and I think that's standard now. But it still fills up eventually.

Hmm now a PK Weir. PK="Piano Keys"

Check out the cool one they're building at Lake Isabella 

islander

islander Avatar

Location: Seattle
Gender: Male


Posted: Mar 14, 2023 - 6:21pm

 miamizsun wrote:


good to know
i find terminus to be a weird dam name
it's probably me...


Maybe if there was no outflow?
haresfur

haresfur Avatar

Location: The Golden Triangle
Gender: Male


Posted: Mar 14, 2023 - 5:48pm

 ScottFromWyoming wrote:

...about a Labyrinth Weir. The Terminus Dam at Lake Kaweah, above where Justine's from, is approaching the (literal) tipping point of its fusegates too, so that'll be interesting.

So a dam that's overtopped by an inch will have an inch of water pouring over it along its entire length. If that's a 100' dam, then math people can figure out how much water per hour it can drain. 
———————————————————————

But if they make that edge look like a giant sawtooth, 
}_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{
they can increase the length of the edge that water can pour over, doubling or tripling the volume per hour.

At Terminus Dam, the "teeth" of that weir are designed to tip over if the water gets too high. Water will first pour into a shaft that will then apply upward pressure and tip a giant cube of concrete over, where it will fall off the dam and break up, leaving an Alfred E. Neuman* gap for the water to pour through.

*





That's pretty cool. I read something recently about some other kind of toothed overflow thingy, maybe for a different situation. Thought, "Nice. Don't understand it really but these civil engineers seem to have fun."

Our local reservoir overflowed this year but the conventional spillway worked. Took out a road downstream (and flooded most of a town). Of course they are repairing the road the same way it was rather than raising the bridge. Mainly because there were a lot of roads damaged and they don't have the money to do it right.
ScottFromWyoming

ScottFromWyoming Avatar

Location: Powell
Gender: Male


Posted: Mar 14, 2023 - 5:30pm

 miamizsun wrote:


good to know
i find terminus to be a weird dam name
it's probably me...


Terminus was the settlement at the end of the line for the Visalia Electric Railroad about 120 years ago.

miamizsun

miamizsun Avatar

Location: (3261.3 Miles SE of RP)
Gender: Male


Posted: Mar 14, 2023 - 3:26pm

 ScottFromWyoming wrote:

...about a Labyrinth Weir. The Terminus Dam at Lake Kaweah, above where Justine's from, is approaching the (literal) tipping point of its fusegates too, so that'll be interesting.

So a dam that's overtopped by an inch will have an inch of water pouring over it along its entire length. If that's a 100' dam, then math people can figure out how much water per hour it can drain. 
———————————————————————

But if they make that edge look like a giant sawtooth, 
}_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{
they can increase the length of the edge that water can pour over, doubling or tripling the volume per hour.

At Terminus Dam, the "teeth" of that weir are designed to tip over if the water gets too high. Water will first pour into a shaft that will then apply upward pressure and tip a giant cube of concrete over, where it will fall off the dam and break up, leaving an Alfred E. Neuman* gap for the water to pour through.

*





good to know
i find terminus to be a weird dam name
it's probably me...
ScottFromWyoming

ScottFromWyoming Avatar

Location: Powell
Gender: Male


Posted: Mar 14, 2023 - 1:51pm

...about a Labyrinth Weir. The Terminus Dam at Lake Kaweah, above where Justine's from, is approaching the (literal) tipping point of its fusegates too, so that'll be interesting.

So a dam that's overtopped by an inch will have an inch of water pouring over it along its entire length. If that's a 100' dam, then math people can figure out how much water per hour it can drain. 
———————————————————————

But if they make that edge look like a giant sawtooth, 
}_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{ }_{
they can increase the length of the edge that water can pour over, doubling or tripling the volume per hour.

At Terminus Dam, the "teeth" of that weir are designed to tip over if the water gets too high. Water will first pour into a shaft that will then apply upward pressure and tip a giant cube of concrete over, where it will fall off the dam and break up, leaving an Alfred E. Neuman* gap for the water to pour through.

*


Manbird

Manbird Avatar

Location: Owl Creek Bridge
Gender: Male


Posted: Jul 5, 2022 - 2:49pm

 KurtfromLaQuinta wrote:
Probably need to look at a plastic surgeon store.




I bought a cool tricked out candy apple red tricycle there once. Drove that sucker to work for years. 
Until some drunk kid in a radio flyer t-boned me at a stop sign. I had a cervical convection in my pants!

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