What are DrainageLine_FS and Catchment_FS output tables in Dendritic terrain with unknown stream location?

MartinKral

Hello

please is there anyone familliar with tool Dendritic terrain with unknown stream location who would know what values should we expect at two output tables DrainageLine_FS and Catchment_FS?

Whatever DEM for hydrology modeling we put as input into tool it always ends with those 2 output tables being empty. Another tool's outputs like DrainageLine feature and Catchment classes are OK. Only those 2 tables are empty and I could not find any resource that would describe what values we should expect in those tables.

Thanks

Regards

DeanDjokic

The *_FS tables are the "flow split" tables (for drainage line and catchment feature classes).  They contain the HydroID of a downstream feature if there is more than one downstream feature at a given feature (HydroID of the first downstream feature will be stored in the field NextDownID of the feature itself, while the _FS table will have the additional values). 

In the _FS table, "FEATUREID" field contains the HydroID of the feature that has a flow split, while "NEXTDOWNID" field contains the HydroID of the downstream feature.

The only time there will be an entry in those tables is if you have braided streams in your system (there are flow splits).  If you are using dendritic terrains and you do not provide streams with braids as inputs into the process (as in your case where streams are unknown), these tables will always be empty.