Here is an old thread that used some innovation to control water flow into his pond and divert excess flow.
Too much green That thread never got a lot of discussion so did not stay around long, but I always though the poster did a great job of showing pictures and documenting the steps he went through to improve his main BOW. He put a lot of thought into water flow control. It was one of several
specialty ponds threads that led me to create both my
forage and
sediment ponds.