a term designating all flowing bodies of water, including rivers, mountain streams, brooks formed by rain storms and thaws, and channels, regardless of size and origin. Streams flow over more or less erodable soils, forming a bed or channel. The characteristics of the channel depend on the specific features of the stream, including flow rate, flow velocities, and slope, and also on the properties of the soil. A stream is characterized by fluviomorphological processes, which cause the channel to meander.