I'm trying to find a way to accumulate some flow values along the stream network (from the inlet all the way down to the outlet across the stream catchments).. I'm working with NHDPlus V2 data ( streams and catchments) and GPS data points as my study points. All the data is in vector format. I read about ArcHydro and worked with the tool but it was confusing and not helpful. I'm wondering if you could help me finr the answer.