Hydro Net and Hydro Net Junction

The feature classes called Hydro Net and Hydro Net Junction contain the geometric network for the Hydrography Dataset with assigned flow direction for flowline features. Hydro_Net is an ESRI utility network, and Hydro Net Junction contains points for all flowline start and end nodes. These are produced when the NHD is extracted from the National Database and the network is given the name Hydro Net.


Each flowline has a junction point at its starting and ending nodes.

This  is an example of a dendritic network.



Network Types

Pattern Description Controlling influences
Dendritic Random, tree-like branches Flat-lying sedimentary or homogeneous rock
Trellis Long subsequent streams with short tributaries Developed in folded rocks of varying strengths
Multibasinal, Centripetal Stream flow toward one or more central region Interior drainage (sinks), Karst
Deranged Interrupted by swamps and lakes Glaciated regions
Annular Accurate subsequent stream with short tributaries Eroded dome or basin containing rocks of varying resistances
Radial Tributaries radiate away from a central region Central highland
Rectangular Tributaries make right angle bends Jointed or faulted bedrock
Barbed One or more tributaries enter at an angle >90% Captured drainage
Braided Multiple interconnected channels separated by braid bars Sediment load