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How high is the water going to be in the tunnel ?
If you're going to fill it up to anywhere near the height of these side boards, the seams are going to pop unless you SERIOUSLY strengthen them.
Some nails or screws and glue ain't gonna do the job.
Look into angled steel reinforcement at the bottom corners, with steel straps keeping the tops properly spaced.
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Strayed to the Dark Diesel Side
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