Soil Slope
Slope has a tremendous effect on water runoff, erosion, and use of farm machinery. It is expressed as a percent, and is defined as the number of feet that the land rises or falls in a 100-foot horizontal distance. For example, a slope between two points which are 100 feet apart with a difference in elevation of 5 feet would have a 5% slope (Figure 3). Six slope classes are recognized in Oklahoma land judging.

Nearly level --- Land with less that 1 foot elevation change in 100 feet.

Gently sloping --- Land with 1 to 3 feet elevation change in 100 feet.

Moderately sloping --- Land with 3 to 5 feet elevation change in 100 feet.

Strongly sloping --- Land with 5 to 8 feet elevation change in 100 feet.

Steep --- Land with 8 to 15 feet elevation change in 100 feet.

Very Steep --- Land with over 15 feet elevation change in 100 feet.