I have a number of data points showing the placement of stream gauges. What I'd like to do is to delineate the subwatershed for each point, so that when rainfall events occur, I can see the drainage area for water that will travel through that stream gauge.
I have my clipped DEM, to my area of study (in red), as well as the first stream gauge point I'd like to use for delineation (green):
However, I've tried a handful of guides for this delineation, and each time the output is not correct.
I believe that my main issue is that when the flow accumulation is performed, it is only picking up on the largest nearby river, and not some of the smaller tributaries. The gauge/pour point I'm interested in is very far from the nearest accumulation point:
Some of the steps I've tried: Clip DEM, Fill DEM, Flow Direction, Flow Accumulation, Pour Point (using the green gauge point as the pour point), and Watershed.
I've also followed this guide before: https://imap.maryland.gov/Documents/Training/LiDAR_Mod7_DelineatingWatersheds.pdf
Any suggestions on what I'm doing wrong, or maybe someone has a better guide/ set of steps to get this done?