I'm using ArcGIS 3D Analyst 10.5.0.
I used a groundwater potentiometric surface raster to calculate flow direction in a "springshed" (the groundwater version of a watershed). Now I want to use this flow direction to create a shapefile of "contributing zones" for a set of groundwater wells using this direction.
I have some average groundwater velocities that I will use to roughly estimate a 1-year capture zone size, e.g. a darcy velocity of 10 cm d-1 would lead to 1-year capture zones that extend 36.5 m in the direction opposite of groundwater flow.
Now I want to use my rough estimates of distances of my 1-year capture zone along with my flow direction to create a capture zone for each well. My idea was to create buffers "upstream" from groundwater wells, then somehow angle them in the direction opposite of groundwater flow. I've read through threads explaining how to create square buffers, but I can't find any information for creating buffers that do not center on the attribute or how to angle the buffer using my direction values.
Is buffer the way to do this?