Definitions for "Stream order"
Numbers assigned to streams according to their position within a drainage network. Streams that have no tributaries are first order; streams that receive only first-order tributaries are second order; and larger branches that form when two second-order tributaries combine are third-order, and so on. Stream order designations often vary according to map scale.
The hierarchical number of a stream segment. The smallest tributary has the order number of 1, and successively larger tributaries have progressively higher numbers.
describes the position of a stream in a drainage network, the lower the number the smaller the stream and its catchment.
Keywords:  subaerial
subaerial