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Soil Survey Manual - Table 3-1

Definitions of slope classes

Classes
Simple Slopes		 Complex Slopes Slope gradient limits
Lower Percent Upper Percent
Nearly level Nearly level 0 3
Gently sloping Undulating 1 8
Strongly sloping Rolling 4 16
Moderately steep Hilly 10 30
Steep Steep 20 60
Very steep Very steep >45