topic Conditional Statement in Hydrology in Water Resources Questions https://community.esri.com/t5/water-resources-questions/conditional-statement-in-hydrology/m-p/48107#M232 <HTML><HEAD></HEAD><BODY><P>Hello, I am delineating streams using the hydrology tools in the arc toolbox and I have an issue. It is not that I dont know how to do it or what tool to use, but it is a threshold decision. The "conditional statement" defines the minimum number of pixels that are required to "flow" into another pixel in order for that pixel to be delineated as a stream. I have a 2m, high resolution DEM spanning 164 km2.</P><P></P><P>My question is, if I can put in what ever value I want, how can I remove the subjectivity from that decision? I am currently using a conditional statement of 13,000 pixels (an area of about .1 km). How can I validate this or is there even a way to validate this? </P><P></P><P>Thank you for your time, Michael </P></BODY></HTML> Mon, 27 Apr 2015 19:24:58 GMT MichaelBrown3 2015-04-27T19:24:58Z Conditional Statement in Hydrology https://community.esri.com/t5/water-resources-questions/conditional-statement-in-hydrology/m-p/48107#M232 <HTML><HEAD></HEAD><BODY><P>Hello, I am delineating streams using the hydrology tools in the arc toolbox and I have an issue. It is not that I dont know how to do it or what tool to use, but it is a threshold decision. The "conditional statement" defines the minimum number of pixels that are required to "flow" into another pixel in order for that pixel to be delineated as a stream. I have a 2m, high resolution DEM spanning 164 km2.</P><P></P><P>My question is, if I can put in what ever value I want, how can I remove the subjectivity from that decision? I am currently using a conditional statement of 13,000 pixels (an area of about .1 km). How can I validate this or is there even a way to validate this? </P><P></P><P>Thank you for your time, Michael </P></BODY></HTML> Mon, 27 Apr 2015 19:24:58 GMT https://community.esri.com/t5/water-resources-questions/conditional-statement-in-hydrology/m-p/48107#M232 MichaelBrown3 2015-04-27T19:24:58Z