PHOTO PATTERN DATA ELEMENTS: LAKEBED
The Interior Lowlands- This low, gently rolling prairie land was formed by continental
glaciation; it is characterized by level plains, beds of old lakes, small lake plains with
their usual fringe forms of ridges and belts of hills. The old lakebed with its level
topography with its level topography has fertile lacustrine soil. (Humid)
Form
Plain, flat, low gradient, unmarked.
Drainage
No runoff, high water table, ditch-type, rectangular,
furrows, often with tiled fields.
Gully Characteristics
Cohesive type, level to great extent, gullies are saucershaped if present.
Special Features
Large field patterns of uniform gray tone bordered by
beach ridges.
Color (Photo Gray Tones)
Varies with soil texture, usually uniform, dull gray in wet
zones; where beach ridges occur it is light toned (sandy).
Land Use
Specialized crops, meadowland, dairy herds.
Vegetation
Cleared for cultivation, specialized crops, meadowland,
shallow swamps.
Source: Terrain analysis procedural guide for surface configuration, US Army engineer
topographic laboratories, p. 7-17