distance monitoring point - next downstream junction with Strahler same or higher

[EB1]

Hi all,

I am working on an ArcHydro geometric network of European rivers based on the EU's CCM2 data.

I need to find an automated method to calculate the distance of each of the stations (>1.000) to the next downstream important tributary.

Data info:

- It is a simple dendritic network with HydroEdges and HydroJunctions, with HydroJunctions = Sources, Tributaries, River Mouths and Monitoring Stations.

- Information like FromNode/ToNode, NextDownID, river basin ID, Strahler order, Pfastetter order, LengthDown (distance of each junction to the river's mouth) are already included in the data.

- I am just working with the river network, so I am not using any underlying DEM or watershed layers.

- I use ArcGIS 10.1 (with relevant extensions active).

Question:

I need to figure out the distance between each monitoring station and the tributary that: (1) lies downstream of it AND (2) is of a Strahler order same or (if not same) higher than that of the monitoring station.

Any suggestions??

Thanks in advance!