I would assume that, with a 14 inch overflow pipe, you expect a lot of runoff into the pond. A lot of runoff might mean a lot of junk coming into the pond. Unless I were there to monitor it, I wouldn't constrict an overflow in any way. If the screen stops up it could keep the pipe from doing its job of protecting the dam. You could lose a lot more than minnows. However, you should lose a small percentage and they are extremely prolific.

Look at the link Brettski has provided. I like what Theo is doing. However, for safetys sake, you have to monitor it.

JMO

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa