I need to find the distance (from sampling points on a stream network) downstream to the mouth of a watershed using NHD flowlines and/or a DEM. I do not know how to use code. Thanks for any help on this!
As you explicitly state you do not use code then your only option is to develop up a work flow in model builder using network analyst or use specialist tools such a ArcHydro or RivEX which are designed to trace along vector river networks
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