My small 3/4 acre pond has a six inch pipe for it's main over flow and I've seen bluegill in the ditch that the water flows into. There has never been allot of them, but when it's rained really hard and the water is flowing full force, I can sometimes find a few laying around when the water dries up.
I just consider it part of natures way to thin down on the numbers of bluegill.
Eddie
