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Thermocline query
#535812 05/28/21 06:15 PM
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In the hottest days of summer here in east Texas, a distinct thermocline occurs in almost all bodies of water. At my place, where the max depth is 21 feet, the thermocline usually forms around 9 feet deep.

I haven't measured the water temps below the thermocline, though I do know the top layer gets to the upper 80s, maybe even 90 at times. But I'd be interested to know what other pondmeisters have found re temperatures below the thermocline. How big a difference? Does the bottom water, here about 12 to 21 feet, stay below 72F all summer? Below 75?

Yeah, I get it: "It depends." But at least I'd like to have some idea of what similar BOW do.

Last edited by anthropic; 05/28/21 06:23 PM.

8ac, full 3/16. CNBG, RES, FHM 10/15; TP 5/16; FLMB 6/16. 100 12" NLMB & 1k GSH 10/17,L, 150# TP & 70 HSB 5/18. 1k PK 11/18. 100# TP 4/19, 200# RBT 12/19, 10k TFS 3/20, 100#TP 5/20, 25 HSB & 250 F1 9/20,L,180# RBT 12/20, 206, 7k TFS,100#TP 5/21, 225



Re: Thermocline query
anthropic #535827 05/29/21 06:09 AM
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Wish I could help but it has been a long time since I measured the temps top to bottom prior to adding the diffusers. And in the past 5 yrs, the diffusers have eliminated the thermocline. My memory kinda sucks but I think there was a 7-degree difference at the thermocline prior to adding the diffusers. I want to think the water temps have reached 91 one time in August. It is hard on the HSB and not so much on the LMB.


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Re: Thermocline query
anthropic #535839 05/29/21 03:02 PM
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Thanks, Tracy. I'd like to oxygenate the bottom layer such that both HSB and LMB would be comfortable & unstressed, even on the hottest summer day. Gotta think that both would be healthier without heat stress. Heck, maybe even keep cool/cold water fish alive over the summer.

That's a tall order, though. Still trying to find a way.

Last edited by anthropic; 05/29/21 03:03 PM.

8ac, full 3/16. CNBG, RES, FHM 10/15; TP 5/16; FLMB 6/16. 100 12" NLMB & 1k GSH 10/17,L, 150# TP & 70 HSB 5/18. 1k PK 11/18. 100# TP 4/19, 200# RBT 12/19, 10k TFS 3/20, 100#TP 5/20, 25 HSB & 250 F1 9/20,L,180# RBT 12/20, 206, 7k TFS,100#TP 5/21, 225



Re: Thermocline query
anthropic #535864 05/30/21 08:16 PM
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To oxygenate cool water, you need a way to oxygenate cold water without mixing the waters above. So it won't be standard aeration. I am reminded of how some indoor systems supersaturate water using high pressure injection of air or oxygen. If you draft cold water, saturate it, and then discharge at or below the thermocline ... Maybe?

As for the minimum temp below the thermocline, this would be the ground water temp. This would be the lower limit and could be low enough in a deep pond to sustain trout provided it is near saturation of oxygen.


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Re: Thermocline query
jpsdad #535987 06/02/21 02:07 PM
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Originally Posted by jpsdad
To oxygenate cool water, you need a way to oxygenate cold water without mixing the waters above. So it won't be standard aeration. I am reminded of how some indoor systems supersaturate water using high pressure injection of air or oxygen. If you draft cold water, saturate it, and then discharge at or below the thermocline ... Maybe?

As for the minimum temp below the thermocline, this would be the ground water temp. This would be the lower limit and could be low enough in a deep pond to sustain trout provided it is near saturation of oxygen.

Good thoughts. If it ever happens, will likely be something along these lines


8ac, full 3/16. CNBG, RES, FHM 10/15; TP 5/16; FLMB 6/16. 100 12" NLMB & 1k GSH 10/17,L, 150# TP & 70 HSB 5/18. 1k PK 11/18. 100# TP 4/19, 200# RBT 12/19, 10k TFS 3/20, 100#TP 5/20, 25 HSB & 250 F1 9/20,L,180# RBT 12/20, 206, 7k TFS,100#TP 5/21, 225



Re: Thermocline query
anthropic #536009 06/03/21 10:34 AM
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Originally Posted by anthropic
But I'd be interested to know what other pondmeisters have found re temperatures below the thermocline. But at least I'd like to have some idea of what similar BOW do.


See this

https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Main=3890&Number=38397#Post38397
















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Re: Thermocline query
anthropic #536029 06/03/21 02:47 PM
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Thanks, Eric! Good info, obviously my BOW will be somewhat different, but at least it gives me an idea. My place is of similar depth, max 21 ft.

Last edited by anthropic; 06/03/21 02:52 PM.

8ac, full 3/16. CNBG, RES, FHM 10/15; TP 5/16; FLMB 6/16. 100 12" NLMB & 1k GSH 10/17,L, 150# TP & 70 HSB 5/18. 1k PK 11/18. 100# TP 4/19, 200# RBT 12/19, 10k TFS 3/20, 100#TP 5/20, 25 HSB & 250 F1 9/20,L,180# RBT 12/20, 206, 7k TFS,100#TP 5/21, 225




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