The drainage pattern on the topographic map and the earth image shows the direction of stream flow and the influence of topography on the landscape. By examining the drainage pattern, we can determine the direction of erosion or retreat of the landscape. Typically, the direction of erosion is in the same direction as the flow of water, following the path of least resistance.
In this case, we can see that the stream flow is generally flowing from the higher elevations to the lower elevations, indicating that erosion is occurring in a downstream direction. This is also supported by the fact that the drainage pattern shows a dendritic (tree-like) pattern, which is characteristic of areas with flat-lying or uniform rock formations.
Furthermore, we can also look at the topography of the area to determine where erosion is likely to occur. Typically, areas with steep slopes or areas where the rock is easily eroded will experience more erosion than areas with gentle slopes or resistant rock formations.
Overall, by examining both the drainage pattern and the topography of the area, we can determine that erosion is likely occurring in a downstream direction, following the path of least resistance and influenced by the topography of the landscape.