The rectangular shape just doesn’t make sense, the water wouldn’t have flowed as well compared to the circular PVC we use and why were they metal? It’s rigid hard to move, not particularly aesthetic and if you want to cut it it’s quite a chore.
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I’m unclear why you think the pipe being rectangular rather than round would in any way affect the water flow down it? So long as it’s big enough to accept the amount of water flowing into it, its shape doesn’t matter than much.
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