Relationship between degrees, percent slope, and ratio to express slope gradient

Slope gradient is a key factor in influencing the relative stability of a slope. It determines the degree to which gravity acts upon a soil mass. Slopes are often irregular and complex, with gradients varying greatly throughout a given shoreline profile. Each slope profile section should be treated as a separate management and restoration site unit. Slope gradient can be expressed in several ways. The table and slope determination formulas below illustrate three commonly used notations.

Degrees (°) Percent (%) Ratio (H:V)
2.5 5.0  
5.7 10.0 10:1
10.0 17.6  
14.0 25.0 4:1
18.0 33.5 3:1
19.3 35.0  
20.0 36.4  
24.2 45.0  
26.1 49.0  
26.6 50.0 2:1
30.0 57.7  
33.0 66.7 1.5:1
35.0 70.0  
38.6 80.0  
42.0 90.0  
45.0 100.0 1:1
55.0 142.8  
60.0 173.2