topic Re: Creating Streams with different accumulation areas help in Water Resources Questions https://community.esri.com/t5/water-resources-questions/creating-streams-with-different-accumulation-areas/m-p/368306#M1812 <HTML><HEAD></HEAD><BODY><SPAN>Using Arc Hydro, there is a point in the process where you put in the&nbsp; number of cells at which streams should start. This is the stream&nbsp; definition step. Maybe this is the process you need to go through. See&nbsp; link below my signature for several posts on Arc Hydro.</SPAN></BODY></HTML> Wed, 24 Jul 2013 23:30:56 GMT MarkBoucher 2013-07-24T23:30:56Z Creating Streams with different accumulation areas help https://community.esri.com/t5/water-resources-questions/creating-streams-with-different-accumulation-areas/m-p/368305#M1811 <HTML><HEAD></HEAD><BODY><SPAN>Hello,</SPAN><BR /><BR /><SPAN>I am USING USGS 1/9th Arc Second Dem data to determine watersheds. I also want to create a stream network with only creating the streams once the flow accumulation passes the 50 acre threshold. I no I need to use the raster calculator to create a new raster with only cells over a certain number and that's based the threshold I want but I can't seem to get this to work properly. I have been assuming the DEM cell sizes are 30m by 30m. Is there a way to determine the actual sizes?</SPAN></BODY></HTML> Tue, 23 Jul 2013 14:07:46 GMT https://community.esri.com/t5/water-resources-questions/creating-streams-with-different-accumulation-areas/m-p/368305#M1811 GregSullivan1 2013-07-23T14:07:46Z Re: Creating Streams with different accumulation areas help https://community.esri.com/t5/water-resources-questions/creating-streams-with-different-accumulation-areas/m-p/368306#M1812 <HTML><HEAD></HEAD><BODY><SPAN>Using Arc Hydro, there is a point in the process where you put in the&nbsp; number of cells at which streams should start. This is the stream&nbsp; definition step. Maybe this is the process you need to go through. See&nbsp; link below my signature for several posts on Arc Hydro.</SPAN></BODY></HTML> Wed, 24 Jul 2013 23:30:56 GMT https://community.esri.com/t5/water-resources-questions/creating-streams-with-different-accumulation-areas/m-p/368306#M1812 MarkBoucher 2013-07-24T23:30:56Z