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Glossary » B

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A map showing the depth (bottom contours) of water in lakes, streams, or oceans. Can be used to calculate lake volume.


The bottom zone of a lake.


A measure of the amount of oxygen removed from aquatic environments by aerobic micro-organisms for their metabolic requirements. Measurement of BOD is used to determine the level of organic pollution of a stream or lake. The greater the BOD, the greater the degree of water pollution. The amount of dissolved oxygen needed to break down organic materials to carbon dioxide, water, and minerals in a given volume of water at a certain temperature over a specified time period. Also, referred to as Biological Oxygen Demand (BOD).