Can't wait to see this take shape! And remember - small pond, small fish. A few goldfish would do great in a pond this size!
Maybe i missed it - have you confirmed that it holds water?
On the opposite end where the hole is from the bottom make the pipe that will come from both sides have a pipe coming to the top for a clean out. Or if you run one continuous bog pipe from pump out to the end of the run which would almost be a full circle have a 45 degree elbow with the pipe coming slightly above surface of where to pond will top out. This is the same as the other example to have a clean out for the future. I just have a foam roller stick in the end of mine. I unplug it once in awhile to allow water to flush out. Not sure if your going with a liner or repaint that with some or of water sealant. There will be some good folds in the corners but just cover with flat stones and they will hide a lot. You won't see much edge if you plant the right ones growing down into pond as well. I may also suggest a small water spray or fountain in the middle running off the same pump too provide more oxygen to which ever fish you have or a airstone but then you need a air pump. It will be nice have fun.
My quick clean out.
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