Strahler number
= Strahler number
{wiki=Strahler_number}
The Strahler number is a concept used in hydrology and geomorphology to describe the hierarchical order of a stream or river system. It provides a way to classify streams based on their drainage structure. The Strahler number is determined according to the following rules: 1. **Headwater Streams**: Any stream segment that has no tributaries is assigned a Strahler number of 1.