Relationships: network - Which stream order covers the most distance?

A map of the Potomac River stream network is colored by Strahler stream order, where higher order represents a larger stream. Next to the map is a donut chart, showing that small headwater streams (order 1) make up 57% of the river network, by length. The first three orders of streams, together, make up 87% of the network by length. The eighth-order Potomac River makes up less than 1% of the river network, by length. Data for the plot are USGS National Hydrography Dataset High Resolution.