Why Do Streams Show Contour Lines That Bend?

Contour Lines and Terrain Slope

Contour lines are an essential feature of topographic maps, used to represent the three-dimensional shape of the land on a two-dimensional surface. Each contour line connects points of equal elevation, indicating a specific height above sea level. When contour lines bend, it’s a sign that the terrain slope is changing. Streams often follow these curves, as they seek the path of least resistance, which generally corresponds to the natural slope of the land.

Navigation and Stream Following

When navigating using a topographic map, it’s essential to understand contour lines and their relationship to streams. By following contour lines, you can identify areas with steep slopes or ridges, which can be obstacles or landmarks. Streams, as they bend along contour lines, can indicate the direction of the terrain slope and potential hazards such as steep drops or rocky terrain. By paying attention to these curves, you can better navigate through challenging terrain and avoid potential hazards.

Understanding Contour Line Curves

To effectively read contour lines and follow streams, you need to understand the different types of curves they can form. A concave curve, for example, indicates a valley or depression, where the terrain slope is decreasing. A convex curve, on the other hand, represents a ridge or hill, where the terrain slope is increasing. By recognizing these curves and their relationship to streams, you can gain a better understanding of the terrain and make more informed decisions when navigating.