Thanks Mike, I will definitely put an aerator in the pond then. The water table rise and fall is a concern, but not too much of a one after I talked to a few neighbors. Almost every neighbor around me has a pond for similar reason to mine and the couple I talked to said the water table only fluctuates a couple feet throughout the year. I figured as long as I have the contractor get me 15 feet deep in the spring when the water table is high it should remain above 10 feet throughout the year.