you don't need a flat surface; just bury some pinions and each of your 'hoops' will be customized depending on how far down the slope they are. Just set up a string that is approx level, top of slope to bottom, and work your measurements off that. Your plastic will be customized, or you can just let it fold as it will down the slope. That's what I do. When the snow starts piling up, it holds the edge, though I also put some weight on it initially. Watch some youtube videos and see if it's something you can work with.Problem I have is my pond is on a hill side so I have no flat area to build a cover on. The top pond has 24" of water with several water lily. Last year I covered with plywood and straw with a tarp over. Was not pleased with the results as the tarp leaked water in with the mouldy straw. The lower pond I covered 1/2 of it with plywood to stop the snow hitting the pond coming off the roof and shocking the fish. Everything survived the winter last year while I was away for 4 months. The top and bottom pond are part below grade and 1/2 above on the low side with a bog in the centre section.
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