https://community.esri.com/t5/arcgis-pro-questions/reverse-watershed/m-p/1241429#M63446 <P>I am using Arc Pro 2.8 and am trying to figure out how to predict where a stream of lava will flow. I found a guide online on how to run a watershed but after repeated attempts realized it was doing the opposite of what I need.&nbsp;<A href="https://support.esri.com/en/technical-article/000023169" target="_blank" rel="noopener">https://support.esri.com/en/technical-article/000023169</A>&nbsp;I need to predict what the flow will be, but unfortunately this predicts where flow will come from. Are there any tools that can predict where liquid will flow from a designated point?</P> Thu, 15 Dec 2022 01:02:24 GMT DevinMcCoy 2022-12-15T01:02:24Z https://community.esri.com/t5/arcgis-pro-questions/reverse-watershed/m-p/1241429#M63446 <P>I am using Arc Pro 2.8 and am trying to figure out how to predict where a stream of lava will flow. I found a guide online on how to run a watershed but after repeated attempts realized it was doing the opposite of what I need.&nbsp;<A href="https://support.esri.com/en/technical-article/000023169" target="_blank" rel="noopener">https://support.esri.com/en/technical-article/000023169</A>&nbsp;I need to predict what the flow will be, but unfortunately this predicts where flow will come from. Are there any tools that can predict where liquid will flow from a designated point?</P> Thu, 15 Dec 2022 01:02:24 GMT https://community.esri.com/t5/arcgis-pro-questions/reverse-watershed/m-p/1241429#M63446 DevinMcCoy 2022-12-15T01:02:24Z https://community.esri.com/t5/arcgis-pro-questions/reverse-watershed/m-p/1241433#M63448 <P>The <A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/optimal-path-as-raster.htm" target="_self">Optimal Path As Raster</A>&nbsp;tool can be used to 'trace downstream' using the same flow direction raster used to make watersheds.</P><P><EM>The optimal path created can be a flow path based on D8 flow direction. To generate an optimal path in this way, use a D8 flow direction raster as input for the Input back direction or flow direction raster parameter. You also need to supply an Input distance accumulation raster value; the Input distance accumulation raster value is not used to determine the path. Whether you use a constant raster or a digital elevation model (DEM), the path will be the same; only an attribute value on the path will vary. See the Flow Direction tool documentation for more information on D8 flow direction rasters.</EM></P><P>&nbsp;</P> Thu, 15 Dec 2022 01:11:03 GMT https://community.esri.com/t5/arcgis-pro-questions/reverse-watershed/m-p/1241433#M63448 curtvprice 2022-12-15T01:11:03Z