topic down slope flow paths from start point in Water Resources Questions https://community.esri.com/t5/water-resources-questions/down-slope-flow-paths-from-start-point/m-p/389189#M1881 <HTML><HEAD></HEAD><BODY><SPAN>Is it possible using ArcHydro to specify some start points (manholes) and a DTM and have the downhill flow path created for each manhole? - i have approximately 10,000 nodes to analyse.</SPAN><BR /><BR /><SPAN>I've already managed to do this with the r.drain module in Grass but wanted to see if I could do it in Arc because i think it will be easier to automate in Arc than Grass.</SPAN><BR /><BR /><SPAN>Many thanks in advance</SPAN><BR /><BR /><SPAN>Running ArcView + Spatial Analyst 10 sp2 + latest ArcHydro Tools</SPAN></BODY></HTML> Wed, 06 Jul 2011 09:59:59 GMT jamiefinney 2011-07-06T09:59:59Z down slope flow paths from start point https://community.esri.com/t5/water-resources-questions/down-slope-flow-paths-from-start-point/m-p/389189#M1881 <HTML><HEAD></HEAD><BODY><SPAN>Is it possible using ArcHydro to specify some start points (manholes) and a DTM and have the downhill flow path created for each manhole? - i have approximately 10,000 nodes to analyse.</SPAN><BR /><BR /><SPAN>I've already managed to do this with the r.drain module in Grass but wanted to see if I could do it in Arc because i think it will be easier to automate in Arc than Grass.</SPAN><BR /><BR /><SPAN>Many thanks in advance</SPAN><BR /><BR /><SPAN>Running ArcView + Spatial Analyst 10 sp2 + latest ArcHydro Tools</SPAN></BODY></HTML> Wed, 06 Jul 2011 09:59:59 GMT https://community.esri.com/t5/water-resources-questions/down-slope-flow-paths-from-start-point/m-p/389189#M1881 jamiefinney 2011-07-06T09:59:59Z Re: down slope flow paths from start point https://community.esri.com/t5/water-resources-questions/down-slope-flow-paths-from-start-point/m-p/389190#M1882 <HTML><HEAD></HEAD><BODY><SPAN>Hi Jamie,</SPAN><BR /><SPAN>I've been using TauDEM plugin (ver 3.1) for ArcGIS (9.3) developed by David Tarboton at USU. He has developed a number of specialist functions including 'Down slope influence' which does exactly (I presume) what you are looking for. It is limited to a grid size of 7000 x 7000 cells and it's accuracy is controlled by the accuracy of your DEM. I'm using it on 1-2m resolution LIDAR dems for culvert sizing.</SPAN><BR /><BR /><A _jive_internal="true" href="https://community.esri.com/www.hydrology.usu.edu/taudem/taudem3.1/index.html">www.hydrology.usu.edu/taudem/taudem3.1/index.html</A><BR /><BR /><SPAN>It also has many functions that are similar to ArcHydro but is not really comparable.</SPAN><BR /><SPAN>Hope this helps....</SPAN><BR /><BR /><SPAN>Regards</SPAN><BR /><SPAN>Colin Constance</SPAN></BODY></HTML> Wed, 14 Dec 2011 04:02:58 GMT https://community.esri.com/t5/water-resources-questions/down-slope-flow-paths-from-start-point/m-p/389190#M1882 ColinConstance 2011-12-14T04:02:58Z