What is the bottom of the stream channel called?

The bottom of the stream channel is called the streambed. This term specifically refers to the substrate or surface that forms the base of the waterway, where aquatic organisms can live and various sediment types may settle. The streambed plays a crucial role in the ecology of the stream, influencing water flow, habitats for benthic organisms, and the overall health of the aquatic ecosystem.

Other terms, such as streambank, channel bed, and floodplain, describe different features related to a stream. The streambank refers to the sides of the stream channel that help contain the water, while channel bed is a less commonly used term but can also imply the bottom surface. The floodplain refers to the land adjacent to the stream that can be inundated with water during flooding events and is separate from the streambed itself. Understanding these distinctions is vital for grasping the hydrology and geomorphology of stream environments.