Expanding / Adding to Existing Pond
I currently have a 1000 gallon pond which I built 8 years ago. I am interested in expanding the pond. I do not want to remove the pond because the Koi are to large to keep out of the pond for the new construction and I don't want to risk loosing them. I am considering building an adjacent pond about 1 foot higher.
Has anyone done this? Would it be possible to create a spillway or 1 foot falls that would be 6 to 8 foot wide connecting the top pond from the bottom.
Any links with pictures would be helpful.