Matplotlib streamplot arrows pointing the wrong way

Question

I am generating a groundwater elevation contour and a streamplot in matplotlib

The contour indicates that the elevation is decreasing in many areas but the groundwater

Answer 1

You can specify the arrow style with arrowstyle='->'. Try both of these and see if this works for you:

plt.streamplot(xi, yi, dx, dy, color='c', density=1, arrowsize=3, 
               arrowstyle='<-')

plt.streamplot(xi, yi, dx, dy, color='c', density=1, arrowsize=3, 
               arrowstyle='->')