Wood size for above ground pond?

[Ryanlion]

I am planning to build a pond with approx internal size 7'6" x 6' narrowing down one side to 4' and Will be 3'6" deep. 3' of the height will be above ground.

I am thinkng of using 6"x2" kiln dried easy edge fsc wood for the frame (bolted together) with 18mm ply internally.

would the above appear sufficently strong enough for the size of the pond (any advice appreciated)?

 

[sissy]

There are few on here that have done wood above ground ponds with success .

 

[MoonShadows]

At almost 8 feet long and 3.5 deep, I would think the 2x6's will begin to bow out unless you have good lateral support, like so...

Take a look at this link for an idea.
https://plantpostings.blogspot.com/2012/08/how-to-make-above-ground-pond.html

 

[mrsclem]

We have a 10'x10' above ground built from 2x12s. 4x4 posts set in concrete every 2 1/2'. The walls have bowed out about 6" in 5+ years. Pond is 5' deep.

 

[Ryanlion]

Thanks for the fast replies and the welcome. I must admit I was planning to have the 2" wood as the thicknes of the pond along with the 18mm ply inside, but perhaps that isn't going to be up to the job, so maybe as a compromise I will consider 4"x2" with the 4" as the thickness for the frame and then the ply inside, and 6"x2" as the lateral supports (as per moonshadows diagram).

Thanks again

 

[Ryanlion]

We have a 10'x10' above ground built from 2x12s. 4x4 posts set in concrete every 2 1/2'. The walls have bowed out about 6" in 5+ years. Pond is 5' deep.View attachment 99704

Sounds like I was definitely wrong to even consider using 2" walls.

 

[mrsclem]

I think where our problem is the ground the posts are set in is mostly sand. Also, the depth on ours is greater than what you are planning. Ours has been up for almost 6 years and I don't see any problems other than the slight bow. BTW- we used 3/4" lag bolts to hold everything together!