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It sounds like what you are looking for is hydrologic sequencing. ESRI's ArcHydro Tools may have this incorporated in their tools. Also NHDPlus has hydrologic sequencing as an attribute to natural flows. You would have to reach out to either of these entities to get more information. - Pete Pete Steeves GIS Specialist- USGS 508-490-5054 [log in to unmask] On Fri, Jul 19, 2019 at 9:27 AM Paul Elsholz <[log in to unmask]> wrote: > I am trying to assign unique ID numbers to catch basins. Ideally the > numbers would be somewhat in sequence as one travels along the drain pipes > from the outlet. > > > > > IDEAL > NOT IDEAL > > [image: A picture containing object Description automatically generated][image: > A picture containing object, clock Description automatically generated] > > OUTLET > OUTLET > > > > Can someone suggest a workflow, tool, or a python script that might help > me accomplish my goal? I find the idea of doing this manually for > thousands of catch basins abhorrent. I would welcome any suggestions. > > > > *Paul Elsholz, GIS Coordinator* > > *City of Laconia* > > *27 Bisson Ave.* > > *Laconia, NH 03246* > > *Phone: (603) 528-6379 x304* > > *[log in to unmask] <[log in to unmask]>* > > > ------------------------------------------------------------------------- > This list (CTGIS-L) is an unmoderated discussion list for all CT GIS Users. > > To change subscription settings or unsubscribe, visit > https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fs.uconn.edu%2FctgisL&data=02%7C01%7CCTGIS-L%40listserv.uconn.edu%7Cd8491116926748f268a208d70ea821b9%7C17f1a87e2a254eaab9df9d439034b080%7C0%7C0%7C636993987593768776&sdata=IOSV95YjZtkd58GJeDI66i5CJJsGOYhhU1BucZq6MHs%3D&reserved=0. > ------------------------------------------------------------------------- This list (CTGIS-L) is an unmoderated discussion list for all CT GIS Users. To change subscription settings or unsubscribe, visit http://s.uconn.edu/ctgisL.