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PostPosted: Oct 30th, '10, 09:01 
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I'm planning a system and one of my questions is whether to put the tank in the ground. I'm in North Florida USA, hot summers, somewhat mild winters with occasional freezing temperatures. The tank will be round, about 1000 gallons/4000 liters, max. I'm not concerned with the cost of digging the hole. I believe there would be an advantage to having it in the ground with respect to more stable water temperature. I can't think of a reason not to put it in the ground but I would appreciate some feedback on the subject. My tentative plan is to use a distribution valve to flood grow beds in sequence and drain back into the tank without sump. Does this sound feasible?
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PostPosted: Oct 30th, '10, 09:58 
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Thats what I'm planning as well :D I can't see a problem with tanks in the ground and for me it will be to try and keep the water cooler during summer 46Deg C (114.8F).
Just remember to fill the tank first before or during the backfill and try to keep the rain (in Winter) away from the tank, there have been a few that have popped up :think:

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PostPosted: Oct 30th, '10, 23:50 
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I've found being in the ground doesn't help temperature that much unless you shut off the pumps to the GBs during the hottest or coldest part of the day. That being said, I still would prefer being in ground for your planned setup.

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PostPosted: Nov 1st, '10, 08:55 
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If you intend to use an indexing valve to flood the grow beds, the simplest way would be to have the tank sunk most of the way into the ground so the grow beds can more easily drain back to the fish tank.

Having the tank sunk in the ground will give some temperature moderation in our climate but as noted, the flood and drain grow beds are such efficient heat exchangers that the in ground tank only gives you a fractional advantage if you are still pumping to the grow beds during the most extreme parts of the day/night.

However, I have found that if I remove the innards of the indexing valve and flip over my stand pipes, I can set my systems to constant flood for the most extreme seasons if I so desire.

One thing I will note for in ground tanks in a wet climate like Florida. If your tank were to be mostly empty during a heavy rain event, you might have an issue with the tank trying to float out of the ground. Make sure the tank is situated that ground water won't be flowing down to it and into it's hole to try to float it. I've been able to place grow bed on top of concrete blocks and have my in ground fish tank sunk so that 8" are above grade and my extra deep grow beds are still able to drain into the fish tank. This way I can let the top 8" of the water in the fish tank fluctuate and still not worry too much about the fish tank water level being much below grade.

I will warn that catching fish from a big in ground tank can be challenging.

I also have a large above ground tank that I like cause I can do the CHIFT PIST design for the system and the tall fish tank allows for easy flow from the fish tank to the grow beds.

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PostPosted: Nov 1st, '10, 10:30 
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My main FT is in the ground and it doesn't make a great deal of difference on it's own. Most of the temperature exchange occurs in the GBs.

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PostPosted: Nov 1st, '10, 13:18 
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chillidude wrote:
My main FT is in the ground and it doesn't make a great deal of difference on it's own. Most of the temperature exchange occurs in the GBs.


hmmm... maybe inground GBs... seems like a lot of digging...

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PostPosted: Nov 1st, '10, 13:21 
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TheNative wrote:
hmmm... maybe inground GBs... seems like a lot of digging...

definitely, and I wouldn't bother. Having the GBs up at waist height is a huge advantage that I'm glad of every single day.

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PostPosted: Nov 1st, '10, 13:48 
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I have tanks in the ground continues flow system and the temp was a lot lower than Creative1 same area.
I have them covered with shade cloth i think that helps, i got the fingerlings in February and they never looked back.
You can see the system (trout by the waterfall) :wave1:
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PostPosted: Nov 1st, '10, 13:56 
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Yeah, the shadecloth will certainly help.

Are your GBs in the ground too Eagle ?

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PostPosted: Nov 1st, '10, 18:57 
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TCLynx wrote:

I will warn that catching fish from a big in ground tank can be challenging.



Big net, long handle, for sure.


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PostPosted: Nov 1st, '10, 19:02 
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[/quote] Having the GBs up at waist height is a huge advantage that I'm glad of every single day.[/quote]

Thanks. Got you on that point.


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PostPosted: Nov 3rd, '10, 08:40 
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Hi all,
My GBs are in the ground temp at the moment is 17deg
Eagle :wave1:

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PostPosted: Mar 18th, '13, 22:53 
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hey all

I'm new to this and am setting up a greenhouse aquaponics system in Missouri, and am trying to figure out if i should put this fish "pond" in ground or not... i find it hard to believe that inground doesn't offer any relief from the heat... how do you all deal with summer temperatures? any pictures/comments/advice would be awesome.. im using a 10x12 greenhouse.. i suppose peoples backyard ponds are ok in the summer heat, so as long as the fish tank is shaded it should be cool enough?
thanks

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PostPosted: Mar 22nd, '13, 08:24 
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I set mine in the ground to help preserve heat in the winter months. I insulated the top 18 inches, but kept the bottom in contact with soil, as the soil will help cool in the summer, and gather heat (what little there is) in the winter.

I had to develop a tight lid, with 1/8 wire to kevarela eps, bugs, varmints, and grand kids out.

I love my setup, and has made for a real tidy look.


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PostPosted: Mar 22nd, '13, 10:18 
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When you're pumping the water through the growbeds all day/night then the buried tank doesn't make much difference at all, all the heat exchange happens in the growbeds..

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