Morning,

We're soon to reoccupy our old house. The pond that we had there
suffered greatly during our absence, and despite it's large size and
depth it has become totally infested with Anacharis and Parrots'
Feather. In addition to such a terrible fate, the pole barn is soon to
collapse into it- while we were away the sides of the pond collapsed in
and it has migrated to the wall of the barn and into it. So, needless to
say, that pond is going away by being refilled.

We have bought the lot next to ours, and being on a hill as it is
we're having half of it converted into a large pond for fishing. It'll
be pretty deep and probably close to 100' by 45 or 55'. Since we're
putting in a replacement goldfish pond, probably in that area, I'm
wondering if there would be a problem having the large pond feed the
goldfish pond? The large pond will be earthen-bottomed, and be planted
with local aquatic plants (Rough River Lake, Kentucky). It will house
Bluegill and Bass fish for the express purpose of fishing- our kids love
to fish. The goldfish pond will be lined and contain what butterfly koi
and comets that we can rescue from the pond-not-to-be. Plants will be
mostly lillies and hyacinths with some other little goodies- all
potbound, we've learned our lesson! They would be connected by a PVC
pipe that I'd have some kind of strainer in to keep out things from the
large pond and a valve for refilling ease, and there would be probably a
bog filter area.

Could it be problematic to have the two ponds share the same water?