I would have insisted that my contractor used a sheeps foot roller to ensure the soil was compacted correctly.

I would have done a better job on understanding my soil conditions.

I would have made the pond larger than I thought I wanted it. Each and every year since I have manually expanded it.

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1/10 - 1/4 acre pond plus 16 ft deep/ Plus 40 ft by 20 ft by 6 ft deep koi and fathead minnow pond next to it. Upstate NY