For Azteca's pond situation and winter aeration - look at the large percentage of open water compared to pond size.
Dwight - There is probably a whole book chapter that could be written for what is a "normal" pond. Each pond like each person is in some way unique. Actually truth be known there probably is no "normal" pond.
Webster says "Normal" is conforming to a type, standard, or regular pattern : characterized by that which is considered usual, typical, or routine.
Ponds probably do not fit into that "normal" definition if one really understands the complexity and interactions of pond chemistry, the many physical parts, and the extensive pond biology involving the food web. As with humans there are too many constantly changing variables in the system to make a pond normal.
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