topic river merge problem in basin processing using ArcGIS via the Hec-GeoHMS extension in Water Resources Questions https://community.esri.com/t5/water-resources-questions/river-merge-problem-in-basin-processing-using/m-p/203319#M953 <HTML><HEAD></HEAD><BODY><P>Hello! I use the Hec-GeoHMS 10.1 extension in ArcGIS 10.1. After merging 65 subbasins into one basin, I'm trying to river merge all individual streams unsuccessfully. The message from the above action is: disconnected rivers or rivers meeting at confluence can not be merged. I notice that all individual streams are meeting at a confluence. I would like to ask if I'm doing something wrong or if there is an alternative methodology in order to merge all rivers in one. Thank you in advance.</P></BODY></HTML> Fri, 14 Jun 2019 09:25:41 GMT sofiasarchani 2019-06-14T09:25:41Z river merge problem in basin processing using ArcGIS via the Hec-GeoHMS extension https://community.esri.com/t5/water-resources-questions/river-merge-problem-in-basin-processing-using/m-p/203319#M953 <HTML><HEAD></HEAD><BODY><P>Hello! I use the Hec-GeoHMS 10.1 extension in ArcGIS 10.1. After merging 65 subbasins into one basin, I'm trying to river merge all individual streams unsuccessfully. The message from the above action is: disconnected rivers or rivers meeting at confluence can not be merged. I notice that all individual streams are meeting at a confluence. I would like to ask if I'm doing something wrong or if there is an alternative methodology in order to merge all rivers in one. Thank you in advance.</P></BODY></HTML> Fri, 14 Jun 2019 09:25:41 GMT https://community.esri.com/t5/water-resources-questions/river-merge-problem-in-basin-processing-using/m-p/203319#M953 sofiasarchani 2019-06-14T09:25:41Z Re: river merge problem in basin processing using ArcGIS via the Hec-GeoHMS extension https://community.esri.com/t5/water-resources-questions/river-merge-problem-in-basin-processing-using/m-p/203320#M954 <HTML><HEAD></HEAD><BODY><P>Sofia, you can manually delete river segments that will not be modeled as routing reaches through an edit session.&nbsp; I think you'll only use River Merge where you'll end up with one single continuous line that does not branch.&nbsp; Hope this helps.&nbsp; Kurt</P></BODY></HTML> Tue, 18 Jun 2019 14:56:29 GMT https://community.esri.com/t5/water-resources-questions/river-merge-problem-in-basin-processing-using/m-p/203320#M954 KurtisBaron 2019-06-18T14:56:29Z