Thank you for your advise. I was going to line the top shelf with breeze blocks and then lay the underlay and liner behind this, or over the blocks. Sloping the wall in towards the centre is probably a better optionOne way is to over dig your foundation. so lets say you want you pond to be 4 feet deep and have one shelf. i would dig down the 4 foot but instead of making vertical walls over dig it so after you place your underlayment if there is going to be one and your rubber liner .lay out the rubber and start installing your rocks "large 24"- 30" prefered layout your wall in the pattern you wish and thn fold the rubber over the rocks and backfill up to the stone wall you just made. Compacting is key here you don't want the sand settling down the road and stretching the rubber out and causing a leak. repeat this step for your second vertical wall...
Easiest way is to just pitch the slope toward the bottom of the pond.
Or you can cut in bond beams pour concrete footings and build cinder block walls . i would pin your walls to your footings/ bond beams
i did similar for different reasons but for the same purpose to keep the sides from collapsing you can find it here https://www.gardenpondforum.com/threads/going-for-it-phase-one-12-000-gallon-pond.22563/page-4
Better solution possible but if your temps get that high then i would say you need some depth to your pond to keep the fish cool. and to slope the walls is going to require a lot of space to build the pond .Thank you for your advise. I was going to line the top shelf with breeze blocks and then lay the underlay and liner behind this, or over the blocks. Sloping the wall in towards the centre is probably a better option
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