The pond water circulates through the open bottom, so the O2 levels are the same as the pond.
Yes, mine got dirty and had to be removed and cleaned monthly. Since the fish didn't use it, that only lasted 3-4 months before I gave up. I used a tall glass vase about 10-12" wide and 2 1/2' tall. Maybe if I put floating food in it they'll use it, I'll probably try again when the water is warm enough to go in the pond and set it up, they look neat.

Your video, Building a Fish Tower in a pond, has made it into the Top 15 New Videos listing. Congratulations on your achievement. For your contribution you have been awarded 1 Power Point.

I tried something similar in my pond, but the fish never used it.

From the guy who owns the property and posted the video:

Update:
DAM REBUILT
6 weeks after this Collapse the Beavers rebuilt the dam to 4 ft high. The pond is now two thirds full and their house entrance should be accessible for the winter. By next summer I expect it to be totally rebuilt. -yt

Also here is a video with the new beaver pond in it(beginning of video), about four months after the original damn broke, I assume, as the videos were posted that far apart. https://youtu.be/ubk9vXVJ1q4

I looked, and the mapping shown is incredibly idealize/generalized estimates, not actual mapping in detail that would give useful information. The only thing actually mapped is surface springs.

But this isn't radon. It's particulate contamination suspended in water. I'm pretty sure it doesn't act as you suggest, or the pond would not retain radioactivity, it would quickly release it to the environment. Since the pond was not 'capped', I'm going to go out on a limb and guess it's fairly stable, otherwise they would be contaminating the area with radioactive air constantly...which would never be allowed today.

If we were talking about whole sale replacement of the waterway with 100% pure waste water from the pond you'd be on point.

The pond in the article held 250 Mgal.

http://pubs.usgs.gov/fs/2008/3080/

The stats linked state that Florida groundwater usage in 2005 for drinking purposes alone was 4,242 Mgal per day, and another 2,626 Mgal per day was taken from surface water sources for drinking. So 250 Mgal as a one time release, of water with a very low radiation level already isn't going to hit that hard, nor linger around long enough to concentrate like in your scenarios.

Just seen the video of mark you uploaded... Do you know any more about his story or where he is now? Hope things are good in Canada... Best wishes from across the pond

Spencer

I always thought it was Aunt Flo, but maybe it's different across the pond.

Coal is massively dirty, but even if you do run it through clean burning plants, the main danger is not the smoke.

Coal contains trace amounts of radioactive materials. Depending on the 'dirtiness' of the coal, the true problem is that by mining it or burning it, you separate those trace amounts. Larger amounts of coal ash or coal tailing(s) from even your average coal will give a geiger counter fits.

Do you want to know the fun part? The coal industry has buried studies and lobbied for legislation that makes TENORMS (technologically enhanced naturally occurring radioactive material) unable to be regulated the same as any other radioactive waste. So if you live in a coal producing or burning area that creates ash or tailing ponds, you can be sucking up the same amount of alpha particle radiation as if you were in the vicinity of a nice large pool of nuclear waste.

Ain't coal grand?

...and yet my take away was the raccoons washing their paws in the pond and chilllaxin' on the settee.

I would like to point out that, at 1:05, you can see what looks like the car in the water slowly sinking but still above water, and absolutely no officer anywhere near the water trying to help. Even if I'm mistaken about that being the car, the video covers most of the pond, and there's no officer seen anywhere trying to go in, or climb out. This video apparently contradicts the officers and Sheriff's account that they tried but could not get into the water. Had it happened, it would have been caught on ONE of those dash cams at some point.

Yes, it is well beyond hope to think that THIS video makes a retraction proper.
The clip does not show a single person go into the water, water that had at LEAST 5-10 cameras pointed at it the entire time...yet they don't have ANY footage of ANY cop going even ankle deep....they have footage of 2 cops that took off their belts, one of which MAY be damp below the waist, or maybe not.
If I see you drowning and I take off my belt and stand around talking to my friends while you die...did I save you? Did I even try?
We have seen multiple angles of the pond with the car sinking in it, but absolutely zero footage of any cop even wading in, much less ALL the cops diving in to save the 3 girls. Every cop that didn't TRY is a murderer IMO. They have a clear legal DUTY to TRY...it's what they're paid to do.

It sounds like this department would benefit from water proof body cameras. The word of the police is less than worthless, they are professional, trained liars that lie as part of their job. I don't trust what liars say. You are free to trust admitted professional liars all you like, but I won't be following you down that rabbit hole.

Yes, we are at the point where, if cops CLAIM they did the right thing but still had terrible results as if they had NOT done the right thing, it clearly didn't happen with out proof that they did the right thing. That's what happens when you do the wrong thing so consistently, you lose the benefit of a doubt.

They are all still liars and murderers...even if what they claim, that one officer waded in and tried to save them, is true (and by no means am I saying it is), the other dozen cops sat back and did nothing but wait for death. EDIT: They could easily have made a human chain from shore to the car and saved all 3 with no 'danger' besides dirty uniforms.

Well...

I don't know what to make out of this press conference, then, 2 days ago---where the Sheriff says the deputies you can see NOT doing anything aren't the ones who waded into the pond---

And that the ones who did wade in can be seen in other dash cam videos without belts and later without their pants (he has a pretty clear moment where he points out that deputies don't take off their belts or pants randomly for no reason at all...)

So---this might be a more unclear story...

https://www.youtube.com/watch?v=cZkDSXmhQe0

@newtboy

Actually , you only know that this deputy on this dashcam stayed out of the pond. Link below has the rest of the story, namely that there is additional dashcam footage, all of it released to the media. Somebody decided to put out just this clip on social media to claim the police lied about trying to save the girls. I'll post a link to the other dashcams if I come across it, but the link below came up within 5 minutes of checking the accuracy of this account.

https://m.reddit.com/r/videos/comments/4g8p71/sheriff_lays_into_media_for_misleading_reporting/

I don't think it qualifies as snuff, you don't see anything.

I think the thing that is upsetting most people is that the cops claimed they tried to go in and save them. If they would have just been honest and said that it was a swampy area full of alligators, so they called for rescue and waited, people would have been more understanding.

Not saying they shouldn't have jumped in, but if they weren't trained to deal with rescue in a swamp environment it could have just led to more deaths. From everything I have read, the pond was more like a mire, full of muck and sludge.