Pond build - Woodworking Talk - Woodworkers Forum
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post #1 of 14 Old 04-06-2020, 10:46 PM Thread Starter
808
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Pond build

6'x3'x2'

2x4 and 3/8 plywood

About 250 gallons.

Will this work?

Pond build-aqua-2-_1586227368960.png
Pond build-aqua-3-_1586227383899.png
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post #2 of 14 Old 04-07-2020, 06:53 AM
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That will work fine, be sure to use a 45 Mil EPDM liner. What are you planning to use as a filter?.
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post #3 of 14 Old 04-07-2020, 01:59 PM Thread Starter
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Quote:
Originally Posted by redeared View Post
That will work fine, be sure to use a 45 Mil EPDM liner. What are you planning to use as a filter?.
Yes 45 was the plan. It's actually for an aqauaponics setup. Stocked to meet need of grow bed.

How would I go about attaching vertical post to the bas and top?
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post #4 of 14 Old 04-07-2020, 03:03 PM
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Quote:
Originally Posted by 808 View Post
Yes 45 was the plan. It's actually for an aqauaponics setup. Stocked to meet need of grow bed.

How would I go about attaching vertical post to the bas and top?
Off topic but my Son and DIL are into Aquaponics. They ditched their corporate lives and went on a Van life expedition. Ended up in Tennessee working for an AP company there(poorly run), now they are working on an organic farm in NJ trying to find some land back here to start their own farm with AP.

Back on topic, I would be cautious with 2x4's and 3/8" ply, 250 gallons of water is a lot of weight, up to 2000lbs, I don't see how 3/8" ply can support that.
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Last edited by shoot summ; 04-07-2020 at 03:07 PM.
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post #5 of 14 Old 04-07-2020, 03:17 PM Thread Starter
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Quote:
Originally Posted by shoot summ View Post
Off topic but my Son and DIL are into Aquaponics. They ditched their corporate lives and went on a Van life expedition. Ended up in Tennessee working for an AP company there(poorly run), now they are working on an organic farm in NJ trying to find some land back here to start their own farm with AP.

Back on topic, I would be cautious with 2x4's and 3/8" ply, 250 gallons of water is a lot of weight, up to 2000lbs, I don't see how 3/8" ply can support that.
I'm just trying to do it as a hobby and provide some vegetables.

I sized down a foot so 5x3x2. And yes I will go with 3/4 ply now.
But how should I attach vertical post?
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post #6 of 14 Old 04-07-2020, 03:32 PM
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Originally Posted by 808 View Post
I'm just trying to do it as a hobby and provide some vegetables.

I sized down a foot so 5x3x2. And yes I will go with 3/4 ply now.
But how should I attach vertical post?
I would build a frame bottom and top(at least) outside of the posts to keep them from spreading.
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post #7 of 14 Old 04-07-2020, 08:17 PM
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The water will be trying to escape at the edges and corners.....

Quote:
Originally Posted by shoot summ View Post
I would build a frame bottom and top(at least) outside of the posts to keep them from spreading.

The liner will help to distribute the forces in the corners but you should use angle iron on the insides and a strap all around the top or at least several inches each way horizontally at the top. I would sandwich the liner under wood strips or metal banding at the top. I'm a believer in overbuilding the first time rather than trying to fix a poorly constructed project after a failure. A massive water leak would be a critical failure and ruin all the flooring and furniture within the area.
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The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #8 of 14 Old 04-07-2020, 08:46 PM
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Quote:
Originally Posted by shoot summ View Post
Off topic but my Son and DIL are into Aquaponics. They ditched their corporate lives and went on a Van life expedition. Ended up in Tennessee working for an AP company there(poorly run), now they are working on an organic farm in NJ trying to find some land back here to start their own farm with AP.

Back on topic, I would be cautious with 2x4's and 3/8" ply, 250 gallons of water is a lot of weight, up to 2000lbs, I don't see how 3/8" ply can support that.

From experience 2x4 and 3/8" plywood is fine. The attached pictures are of a pond setup in my basement for my turtles during the winter, it was used for many years before I made the outdoor large enough for them to winter over outside. You will notice I used less vertical supports than you showed in your diagram.
The last picture is only one I could fine of the actual setup, in the trough is salvinia major to remove some nitrates.
Also I did use 2x6 on the top for extra strength and to keep the turtles from escaping.
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Last edited by redeared; 04-07-2020 at 09:03 PM.
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post #9 of 14 Old 04-07-2020, 08:52 PM
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That's a lot of weight. I believe I'd lock the corners like you would if you were forming a poured wall. At the very least a strong half lap and the reinforcement recommended by Woodnthings.


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post #10 of 14 Old 04-07-2020, 09:21 PM
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Quote:
Originally Posted by 808 View Post
I'm just trying to do it as a hobby and provide some vegetables.

I sized down a foot so 5x3x2. And yes I will go with 3/4 ply now.
But how should I attach vertical post?

I used lag bolts which was fine, all the water pressure is at the base if you lock that in your good, also the plywood makes a skin that ties it into a solid frame. I haven't done hydraulic calculations in 20 years to give you the actual psi.
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post #11 of 14 Old 04-08-2020, 07:34 AM
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I just wanted to mention that because of the dead weight (2,220#) if not placed on a concrete slab it must be placed against a load bearing wall with the lenght perpendicular to the floor joists.
Every 2-3 years I drain my pond to do maintenance, I make a temporary pond for the fish outside about the same size you mentioned just using 2x4's and 3/8" ply held together with 3" lg sheet rock screws, simple and easy to set up and take apart, honestly the water pressure at that depth is not that great
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post #12 of 14 Old 04-11-2020, 03:05 AM Thread Starter
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Thanks. I'm taking your advice.
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post #13 of 14 Old 04-11-2020, 06:29 AM
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It has been a long time since I dealt with hydroponics so my memory may be bad. I do not remember any setup where you need your container to be so deep. I had a cousin who hydroponically grew vegetables commercially. I do not think any of his many dozens of containers (made of concrete) were over 12" deep.


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post #14 of 14 Old 04-11-2020, 07:58 AM
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Quote:
Originally Posted by GeorgeC View Post
It has been a long time since I dealt with hydroponics so my memory may be bad. I do not remember any setup where you need your container to be so deep. I had a cousin who hydroponically grew vegetables commercially. I do not think any of his many dozens of containers (made of concrete) were over 12" deep.


George
This is Aquaponics, fish will be in the "pond", some additional depth is needed because of it.
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