After looking at the map, it seems like he does not usually get lots of extended snowfall in his area. To be on the safe side I would have the pond dug so it would hold 14' to 17' of water. This should allow it to maintain adequate oxygen levels all winter for many years. If the new pond will be over an acre then the entire bottom will not have to be the maximum depth. Large ponds with expansive flat bottoms in your area would only have to be 11' to 12' deep over most of the bottom with one area 20%-25% deeper. However if the pond will receive lots of leaves each fall, I would build the pond on the deeper end of the range maybe even 18 to 19 ft deep in some area.

Bottom aeration and addition of microbes or bacteria products will be important to help "process" any heavy leaf inputs.

As for pond builders he should contact the local Soil and Water Conservation District office for a list of pond builders in his area. Ask them for "off the record" of which builders are most reputable and successful. Cheaper is not usually better when it comes to building ponds. Seek references.


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