Which measurement describes the depth of a pond?

The measurement that describes the depth of a pond is the average depth. Average depth refers specifically to the mean distance from the surface of the water to the bottom of the pond. It is an important measurement in aquatic ecology because it can influence the types of plants and animals that can thrive in the pond, as well as affect water temperature, nutrient distribution, and the overall health of the aquatic ecosystem.

Surface area, on the other hand, refers to the total area of the water's surface and does not provide information about how deep the water is. Volume indicates the total capacity of water within the pond and is a function of both surface area and depth, but it does not directly convey the measurement of depth itself. Water clarity is a measurement of how clear the water is and can be affected by various factors such as algal blooms or sediment, but it does not relate to the actual depth of the pond. Thus, average depth is the most accurate descriptor for the depth in question.