Description: The soil-erodibility factor K represents: (1) susceptibility of soil or surface material to erosion, (2) transportability
of the sediment, and (3) the amount and rate of runoff given a particular rainfall input, as measured under a
standard condition. Fine-textured soils that are high in clay have low K values (about 0.05 to 0.15) because the
particles are resistant to detachment. Coarse-textured soils, such as sandy soils, also have low K values (about
0.05 to 0.2) because of high infiltration resulting in low runoff even though these particles are easily detached.
Medium-textured soils, such as a silt loam, have moderate K values (about 0.25 to 0.45) because they are
moderately susceptible to particle detachment and they produce runoff at moderate rates. Soils having a high
silt content are especially susceptible to erosion and have high K values, which can exceed 0.45 and can be as
large as 0.65. Silt-size particles are easily detached and tend to crust, producing high rates and large volumes
of runoff.
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