I have had months of trouble rebuilding my existing pond, only to make it 1m deeper, bit I'm glad I did it. I was able to go deeper and could extend the old wall by building deeper and used a double side wall. I am not sure what will happen with your foundation, but I would think that basically building a second dam next to your one, with a good connection, as the others suggested, would work.
Alternatively, why not remove the soil next to the area you want to build, break the existing part of the wall of your koi pond, throw a new concrete foundation for the whole pond and build the sides- two walls in the new area and one wall on the inner side of the existing pond. Fill the gap with concrete.
Remember, I'm part of the club: "As jy nie wil hoor nie, moet jy voel". Same as you
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| In any case, if you like to deal with problems, by all means, extent your existing pond and become a member of the “ I should have listened.....................” crowd. |