topic Re: Arc Hydro drainage line not connected in Water Resources Questions https://community.esri.com/t5/water-resources-questions/arc-hydro-drainage-line-not-connected/m-p/1174296#M4199 <P>I don't know if this is the issue you must fill the sinks. Otherwise the flow direction will result in cells that don't flow downstream and the resulting drainage line layer be as you described.</P><P>If you haven't burned in the streams, you may have roads crossing (or other anomalies) in your otherwise good DEM. If these are elevated above the surrounding DEM defined "valleys" the flow direction will stop at the crossings and you will get results as you described.</P> Mon, 16 May 2022 18:52:25 GMT MarkBoucher 2022-05-16T18:52:25Z Arc Hydro drainage line not connected https://community.esri.com/t5/water-resources-questions/arc-hydro-drainage-line-not-connected/m-p/1174289#M4198 <P>I'm currently working on a project in which I need to have a complete and connected drainage line. Once reaching the stage of drainage line processing, my output has discontinuities through various drainage lines when in reality they should be connected . Does anyone know how I could address this issue.</P><P>&nbsp;</P><P>Thanks&nbsp;</P><P>Evan&nbsp;</P> Mon, 16 May 2022 18:34:06 GMT https://community.esri.com/t5/water-resources-questions/arc-hydro-drainage-line-not-connected/m-p/1174289#M4198 EvanAngus 2022-05-16T18:34:06Z Re: Arc Hydro drainage line not connected https://community.esri.com/t5/water-resources-questions/arc-hydro-drainage-line-not-connected/m-p/1174296#M4199 <P>I don't know if this is the issue you must fill the sinks. Otherwise the flow direction will result in cells that don't flow downstream and the resulting drainage line layer be as you described.</P><P>If you haven't burned in the streams, you may have roads crossing (or other anomalies) in your otherwise good DEM. If these are elevated above the surrounding DEM defined "valleys" the flow direction will stop at the crossings and you will get results as you described.</P> Mon, 16 May 2022 18:52:25 GMT https://community.esri.com/t5/water-resources-questions/arc-hydro-drainage-line-not-connected/m-p/1174296#M4199 MarkBoucher 2022-05-16T18:52:25Z