Images of topography obtained after running the code
From GeoMod
This is the initial topogrpahy of land of 25 by 25 cells.
This is the stream network of water. It shows the direction of water it flows from one cell to adjacent lowest elevation cell.
This is the final topography after gully erosion. The cells with blue color shows that erosion is more than the threshold erosion set in the code. The portion in the orange circles signifies that head of the gullies. In this image three discontinous gullies can be seen.
This image is regarding the total erosion from the topography as a result of the gully formation.

