I have a drop inlet box at the edge of the pond water for my overflow and every spring rain you can see tons of small minnows going over the box into the overflow pipe.
I do have cattle panel guard built around the basin to keep big trash from stopping it up, just the other day I added some really fine shaker screen to the cattle panels on both sides of the box from the shore line so that small fish that habitate in the weeds and brush along the shoreline, will have to swim out into the open water about ten ft and come in the end of the opening, which I am hoping will help immensely with the loss of minnows.
I will try to get some pictures of it next time I go to the farm.
Those little minnows seem to be enamored with the water flow dumping into the box, you will see tons of them trying to sit there and swim against the current at the edge of the box till they lose the battle and get swept into the drain.
