I have a large number of rivers and streams on my map which do contain elevation data in the attribute table. I would like the lines on the map representing the rivers to have small reverse arrows sticking out of the line at an angle (i.e. like an arrow head) to show the direction that the rivers are flowing. I have tried to find a line symbology that could do this automatically for me but one does not appear to exist.
Is there any way around this problem?
I know that I could manually add hundreds of arrow heads on top of the hydro lines although I'm hoping that there is a better way.
I am using ArcGIS Pro with a Basic level license so I don't have all of the fancy tools.