topic Derive Floodplain Surface from 3D River Centreline in Water Resources Questions https://community.esri.com/t5/water-resources-questions/derive-floodplain-surface-from-3d-river-centreline/m-p/215112#M1000 <HTML><HEAD></HEAD><BODY><P><BR />I've derived a 3D river centreline from my DEM and have increase the elevation for each vertex by 3m, simulating a flood. I've tried generating automated cross sections based on the 3D river centreline, but the placement of the cross sections start crossing each other with different elevation levels. If anyone has a way to generate a surface (TIN\DEM) that I then can use to subtract from the ground surface (DEM) to estimate the floodplain based on the increased elevation along the river centreline.</P><P></P><P>Any assistance will be apprecaited as I've been struggling with this for the past few days, looking for alternative methodologies to accomplish the following.</P><P></P><P>Regards</P><P></P><P></P><P>Peter Wilson</P></BODY></HTML> Tue, 04 Nov 2014 09:46:41 GMT PeterWilson 2014-11-04T09:46:41Z Derive Floodplain Surface from 3D River Centreline https://community.esri.com/t5/water-resources-questions/derive-floodplain-surface-from-3d-river-centreline/m-p/215112#M1000 <HTML><HEAD></HEAD><BODY><P><BR />I've derived a 3D river centreline from my DEM and have increase the elevation for each vertex by 3m, simulating a flood. I've tried generating automated cross sections based on the 3D river centreline, but the placement of the cross sections start crossing each other with different elevation levels. If anyone has a way to generate a surface (TIN\DEM) that I then can use to subtract from the ground surface (DEM) to estimate the floodplain based on the increased elevation along the river centreline.</P><P></P><P>Any assistance will be apprecaited as I've been struggling with this for the past few days, looking for alternative methodologies to accomplish the following.</P><P></P><P>Regards</P><P></P><P></P><P>Peter Wilson</P></BODY></HTML> Tue, 04 Nov 2014 09:46:41 GMT https://community.esri.com/t5/water-resources-questions/derive-floodplain-surface-from-3d-river-centreline/m-p/215112#M1000 PeterWilson 2014-11-04T09:46:41Z Re: Derive Floodplain Surface from 3D River Centreline https://community.esri.com/t5/water-resources-questions/derive-floodplain-surface-from-3d-river-centreline/m-p/215113#M1001 <HTML><HEAD></HEAD><BODY><P>Hi Peter,</P><P>I'll check out the Hydrology tools linked to Spatial Analyst.</P><P>There are specific tools that cover watershed areas &amp; water flow modeling.</P><P>You might need a mask area for your flood zone as well, so if have a study area its good to have that defined in a shapefile or feature class.</P><P>Some tools might need a 3D analyst license to get the best out of them.</P><P><A href="http://resources.arcgis.com/en/help/main/10.2/index.html#/An_overview_of_the_Hydrology_tools/009z0000004w000000/" title="http://resources.arcgis.com/en/help/main/10.2/index.html#/An_overview_of_the_Hydrology_tools/009z0000004w000000/">ArcGIS Help (10.2, 10.2.1, and 10.2.2)</A> </P><P>Hope that helps,</P><P>William</P></BODY></HTML> Tue, 04 Nov 2014 12:06:59 GMT https://community.esri.com/t5/water-resources-questions/derive-floodplain-surface-from-3d-river-centreline/m-p/215113#M1001 WilliamMortimer 2014-11-04T12:06:59Z