OK, I see a draw coming off the left hand side at the upper end. That one is obvious.

Also, lots of quarries have rock or sand seams that can connect them to others. Thus, they share water like any other aquifer. If your quarry is lower than the surrounding area, ground water should maintain it unless you get a serious drought. If it's ground water, you would have a tough time ever pumping it dry. Of course, if a deeper quarry is dug nearby, on the same aquifer, your water hole could be toast.

Are they pumping from that mess on the right hand side of the pic?

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