The National Soil Erosion Research Laboratory
Raindrops striking exposed soil detach the soil particles and splash them into the air and into shallow overland flows. Raindrops striking these shallow flows enhance the flows's turbulence and help to transport more of the detached sediment to a nearby rill or flow concentration.
Interill detachment is affected by the cover provided by residues and plant canopy. Delivery of interrill sediment to the rill channels is a function of the slope, cover, and surface roughness.