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Originally Posted by DallasNYC  |  | | | | | | | | | For 4' high, you will need 4 sheets of plywood. The bottom and two long sides will all be full sheets, and you could cut another sheet to make the ends.
At 4' high there will be alot of water pressure, 1/2" ply might be strong enough, as long as you had plenty of studs spaced like 12"-16" on center. Not just at the corners. I also think you should go with the pond liner. Especially if you decide to do some plumbing, there all sorts of special bulkheads, and such, made to work with the pond liners. So all and all, I think your initial cost may more than double. | |  | |  | |
I see the costs more than doubling, I would budget a minimum of $500 to $600 for the project. I would use 5/8" ply, 4x4 for the bracing, and the best and thickest pond liner I could find. the last thing you want is 958 gallons of water turning your basement into a swamp.