ssarch

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.

Hi everyone! I use the Hec-GeoHMS 10.1 tool in ArcGIS 10.1. I merged all subbasins into one basin, but trying to river merge all individual streams, I encountered problems. The message from the above action is: disconnected rivers or rivers meeting at confluence can not be merged. I would like to ask if there is an alternative methodology in order to merge them all in one. Thank you in advance.

Hello! I'm running precipitation data every 10 min in a small watershed, using SCS Curve Number, Clark Unit hydrograph and Recession methods. When I'm trying to distribute the 10 min data in hourly data, I notice that the peak flow of the flow hydrograph is a little reduced. But trying to distribute the 10 min data to 5 min data, I find that both hydrographs are the same. Is there a threshold in the time step of precipitation data that Hec-HMS produces the same results?