Floodplains Lab- Part 1
The following questions are based on Map T-4, a portion of the Voltaire, North Dakota topographic map. The map has a contour interval of 5 feet. 1. In which direction is the Souris River flowing? How can you tell? North to southeast
2. What evidence suggests that the river is widening the valley through lateral erosion?
Wide flood plains and meandering
3. Natural levees can be seen along the Souris River in the center portion of the map (north of Westgaard Cemetery). Approximately how high are the levees in feet?
20 ft
4. Explain the formation of the narrow triangle-shaped lake just to the east of Westgaard Cemetery (in the NE ¼ of Section 3). Oxbow lakes 5. Describe the location of two more lakes, swamps, or topographic depressions along the Souris River that formed in a similar way. Use the Public Land Survey township quarter sections to simplify your location description. NE 1/4 of section 1
6. Describe a location where the formation of a new cutoff meander in the Souris River appears imminent? Use the Public Land Survey township quarter sections to simplify your location description. In NE 1/4 of section 1
