Only just found this thread, but as I'm building a pond at the moment, thought I'd share some in progress pics. Our back garden won our local 'In Bloom' competition last year, so we felt we had to raise our game to win it again this year. That, and there was one spot at the end of the garden that we hadn't done anything with yet, so a pond seemed like the obvious thing to do. On top of all this, I always over plan and over spec these sorts of projects, which is why this has turned into a bit of a mammoth thing as shall be seen...
Here's the end of the first day's work, digging a foundation trench for the main bit of the pond. It's going to be 2/3rds pond and 1/3rd bog garden, so I've not bothered with a foundation for the bog garden, but I have for the pond itself, especially given it's built into a bit of a slope.
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One thing I hit when doing it was a load of dead tree roots. This bit of the garden was all overgrown when we got the house, so whilst we've cleared in on the surface, there are still echoes of the past in the ground. I was naughty and used my chainsaw to cut them apart, which then led to a fun evening cleaning mud and water out of the thing.
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Tree roots cleared, the pile of waste soil just gets bigger.
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Once the trench was dug and concrete foundations poured and leveled, the sleepers started to go in for the main tank of the pond. I'm using oak sleepers as apparently they're less prone to rotting underground. The line of sleepers at the back turned into a bit of a pain as they were consistently higher than the others, and a bit wonky too. Another half day of digging out and around them seemed to fix it. Bit of a faff though, especially as oak sleepers are incredibly heavy.
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I've put some large coach bolts down vertically to join some of the sleepers, but most of the supporting work is being done by oak sleepers as upright posts. These went in, then more concrete was poured in to bring it level with the ground, effectively concreting in both the support posts and the bottom two rows of sleepers on the main tank too.
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After that it moved more quickly, the faff of having got everything level to start with meant the upper sleepers just dropped in like jigsaw pieces and could be screwed straight into the support posts. One does not simply screw into oak sleepers though, otherwise the screws get very stuck and have to be snapped off. All sorts of pilot holes are essential.
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With two of the sides now built, I started putting the dug out soil around the outside wall. Partly to support it, but also partly so the pond will be hidden until you walk up to it, which should be a nice effect. We're calling this part of the garden the 'secret garden' for that sort of reason.
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After getting that done, I pressed on with building the other walls and digging out the main tank for the pond.
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Digging out took less time than I thought, as as long as you cut the soil into cubes, it moved pretty easily, like cutting peat. The rest of the soil got mounded up around the frame for the pond and bog garden.
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Here's everything all dug out. The pond is going to have a deep bit in the tank, a 40cm shelf on the left of the tank, and then a shallower shelf (to be filled in with gravel once the liner is in) which should be 20cm deep, and allow our kids to go pond dipping and so forth.
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Still more work to do, but making progress so far.