Our new house has a "pond", with koi fish, which is actually a concrete
lined oval "tub" about 3' deep. I would like to eventually enlarge it
and landscape to make it look more natural. Previous owner did the
concrete work and lined that with epoxy grout. Ideally, I would like to
cut a "U' in the narrower end to make the water flow continuous to
add-on. Is their a tool, DIY or contractor, that will cut concrete
without destroying the pool? If the only option is to cut straight "V",
it might be disguised with stone or plants. Anyone with experience
cutting concrete?