I have come into the chips...my pond is now dug and I just found out yesterday that I can get a chimney that is being demo'ed out of a nearby building. There is approximately 50' of pipe, all of it concrete surrounded by a metal sleeve. I believe it is in 4' sections, so I should have about a dozen of them total. The diameter is either 10" or 12", so a pretty nice sized opening.

I plan on taking them to my pond and putting them in for cover, but I have a couple of questions. My thought was to put them in what will be 9'-12' of water.

Should I concentrate them or space them out randomly? Should I leave them open on both ends or perhaps cover one end up? I was thinking about anchoring them in the slope of the bank and making sure they are set pretty level, with one open end. Any thoughts from someone that has set pipe in their pond(s)?

I am pretty sure they will be dominated by catfish.