I do not know how to come up with the drainage area (km squared) upstream of Lat 77.84, Long -30.96. I have converted my contour shapefile to a raster, identified and filled the sinks and then created a flow direction raster, but after that I am not sure what steps to take.
I can create flow accumulation, but none of this is showing me where to insert my lat and long point to get the drainage area upstream from that point. I have all the hydrology tools, but do not know what to input to get the correct answer. I am a newbie.
I have tried watershed/subwatershed delineation. The results I got were very small areas adjacent to my points. What I need is the whole upstream area that contributes water to that point.