I'm working with ArcGIS 10.2 to try to determine if a given site has some sort of outflow for the water coming into the site. I'm using the ArcHydro tools and have calculated the flow direction and flow accumulation for every watershed in the state. In addition, I have a shapefile that has ~25 polygons (self-created) that depict each of my sites.
I have approximately four broad types of polygons: (1) Type I polygons have stream channels running through them and thus drain well. (2) Type II polygons have small-scale streams coming in (they don't show up because I've set my flow accumulation threshold > 250 pixels). However these polygons DO show a larger-scale stream flowing out of the polygon, and can also be considered to drain. (3) Type III polygons have no apparent streams coming into or out of them, and do not drain. Lastly, (4) Type IV polygons have streams draining in, but do no have streams draining out.
I'm trying to find a way to:
A) calculate the inflow vs outflow to show that Type I and II polygons have more water flowing out than they do flowing in, and thus drain. Versus Type III and IV polygons that have a greater inflow than outflow. B) develop an inflow/outflow model that can then be used on any random polygon in the state to determine which type of polygon it would fall into.