Wow, sorry for your troubles. What you are going thru isn't nice and it's going to take time.... I would talk to the pond builder and see if there is any financial help. Then with them or not, plug the current pipe. Install a siphon drain to a size that would satisfy the county and overflow expectations. Tie that one into the drain that goes under the vineyard. Be done with it and not worry about maintaining something else every year. This is a very short synopsis of what I would do.
PS. You need the outflow of the siphon to end below the inlet of the siphon in the pond. I think it is about 4' ? Sounds like you have that.
As TGW1 mentioned while I was typing, that is very crucial to notice where that water is coming from.
Last edited by fish n chips; 11/11/17 08:10 AM.
